BranchesTags

Repository files navigation

Optional Field

Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page

Provides a Rust type and serialization/deserialization implementations for values that can be represented by 3 states: missing, present but null and present with a value.

pubenumField<T>{Missing,Present(Option<T>),}

This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys and null values as the same, deserializing them to Option::None. A similar problem exists when serializing as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not serialize a field.

This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to set the value to null or not update value should be left alone.

By using Field you are able to distinguish between null values and missing keys and get serde to behave correctly in these scenarios.

use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}

Usage

Field implements many of the methods you are familiar with on Option such as map, unwrap, as_ref etc. Field will return the value from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).

use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}

Features

By default optional-field has serde and the serde macro as dependencies. If you wish to use optional-field without pulling in serde you can set default-features to false.

[dependencies]
optional-field = { version = "0.1.5", default-features = false }

License

MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)

About

Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.

Resources

Readme
MIT license
Activity
Custom properties

Stars

5 stars

Watchers

3 watching

Forks

4 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Optional Field
Want to write Rust for a living? CV Partner is hiring Rust developers in London, Oslo, Copenhagen and Stockholm. See the careers page
Provides a Rust type and serialization/deserialization implementations for values that can be represented
by 3 states: missing, present but null and present with a value.
pubenumField<T>{Missing,Present(Option<T>),}
This can be useful when using JSON or other formats whereby the default in serde is to treat missing keys
and null values as the same, deserializing them to Option::None. A similar problem exists when serializing
as you have to create your own 3-state enum and tag each field with skip_serializing_if in order to not
serialize a field.
This can be problematic with APIs where partial objects or diffs are provided and you don't know whether you need to
set the value to null or not update value should be left alone.
By using Field you are able to distinguish between null values and missing keys and get serde to
behave correctly in these scenarios.
use serde::{Deserialize,Serialize};use serde_json::json;use optional_field::{Field, serde_optional_fields};#[serde_optional_fields]#[derive(Debug,Serialize,Deserialize)]structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let thing = serde_json::from_value::<Thing>(json!({"one":1,"two": null,})).unwrap();assert_eq!(Field::Present(Some(1)), thing.one);assert_eq!(Field::Present(None), thing.two);assert_eq!(Field::Missing, thing.three);}
Usage
Field implements many of the methods you are familiar with
on Option such as map, unwrap, as_ref etc. Field will return the value
from within the Option for these methods but also provides an equivalent set of methods for accessing the Option itself. These equivalent methods follow the
pattern of adding _present to the method name. For example, given Present(Some(100)), unwrap() will return 100 whereas unwrap_present() will return Some(100).
use optional_field::Field;structThing{one:Field<u8>,two:Field<u8>,three:Field<u8>,}fnmain(){let num_field = Field::Present(Some(100));// Calling map gets the value out of the Option within Presentassert_eq!(200, num_field.map(|n| n *2));// Calling map_present gets the option out of Presentassert_eq!(false, num_field.map_present(|opt| opt.is_none()));}
Features
By default optional-field has serde and the serde macro as dependencies. If you
wish to use optional-field without pulling in serde you can set default-features to false.
[dependencies]
optional-field = { version = "0.1.5", default-features = false }
License
MIT license (LICENSE.txt or http://opensource.org/licenses/MIT)
About
Provides a Rust type for values that can be missing or null, for example in the case of serializing or deserializing JSON.
Resources
Readme
MIT license
Activity
Custom properties
Stars
5 stars
Watchers
3 watching
Forks
4 forks
Report repository
Releases
Packages
Used by
Contributors
Languages