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docs(guides): formula fields declare result type via returnType, not type - #2263
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…t `type` `Field.formula`'s config is `FieldInput = Omit<Partial<Field>, 'type'>`, so passing `type: 'currency' | 'text' | 'number' | …` is a type error — and untyped (in an .mdx example) it OVERRIDES `type:'formula'`, which makes objectql skip the field entirely: the engine computes a formula virtual field from its `expression` only (engine.ts), so the field silently never evaluates. Several guide examples taught that broken pattern; some also used a `formula:` key that isn't on `FieldSchema` (the source key is `expression`). Fix all examples to declare the computed value's type with `returnType` (`number`/`text`/`boolean`/`date` — added in framework#2255) and put the CEL source on `expression`; restore the valid `scale` I had dropped; add a Callout in formula.mdx explaining a formula field's `type` is always `formula`. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Why
While reviewing the
returnTypefeature (#2255) I found the formula guides teach a broken pattern:Field.formula's config isFieldInput = Omit<Partial<Field>, 'type'>, sotypeis a type error. And untyped (as in an .mdx snippet), the spread{ type:'formula', ...config }letstype:'currency'overridetype:'formula'— and objectql computes a formula virtual field fromdef.expressiononly (engine.ts:55, nodefaultValuefallback), so the field silently never computes. Some examples also used aformula:key that isn't onFieldSchema(the source key isexpression).So there's no real
type/returnTypeoverlap —typesimply can't be set on a formula;returnTypeis the intended mechanism.Fix
Field.formulaexamples informula.mdx+business-logic.mdx:type: X→returnType: <number|text|boolean|date>,formula:→expression:, validscalepreserved.formula.mdx: a formula field'stypeis alwaysformula; declare the computed value type withreturnType(inferred/stamped by the AI build path); CEL source isexpression.Docs-only; other guides (
data-modeling.mdx,metadata/field.mdx) already used the correct pattern.🤖 Generated with Claude Code