Ectograph

Ectograph is a set of utility functions for using Ecto in combination with GraphQL (specifically this graphql library for Elixir).

defp deps do
[
{ :ecto, "~> 1.1.3" },
{ :graphql, "~> 0.1.2" }
]
end

Features

• Map a Ecto.Type to a GraphQL.Type
• Map a Ecto.Schema to a GraphQL.Type.ObjectType
• Map a GraphQL.Type to a Ecto.Type
• Provide extra GraphQL types, such as DateTime

How to use

Schemas

defmoduleSchemas.QuotedouseEcto.Schemaschema"quotes"dofield:quote,:stringfield:author,:stringtimestampsendendEctograph.Schema.cast_schema(Schemas.Quote,:ecto_to_graphql)# %GraphQL.Type.ObjectType{ name: "quotes", fields: %{ quote: %{ type: ... }, ... }}

Types

Ectograph.Type.cast_type(:string,:ecto_to_graphql)# %GraphQL.Type.String{}Ectograph.Type.cast_type({:array,:integer},:ecto_to_graphql)# %GraphQL.Type.List{ ofType: :integer }Ectograph.Type.cast_type(%GraphQL.Type.String{},:graphql_to_ecto)# :stringEctograph.Type.cast_type(%GraphQL.Type.List{ofType: :integer},:graphql_to_ecto)# { :array, :integer }

Example

You can find a working example at https://github.com/icidasset/key_maps.
The crucial bit is located at lib/graphql/definitions.ex.

Installation

If available in Hex, the package can be installed as:

1. Add ectograph to your list of dependencies in mix.exs:

   def deps do [{:ectograph, "~> 0.0.1"}] end

2. Ensure ectograph is started before your application:

   def application do [applications: [:ectograph]] end

To do

Missing features:

• Casting a GraphQL schema to an Ecto schema (not sure how to implement this)

Things I haven't tried yet:

• Associations
• Embedded schemas

Ecto types that still have to be implemented:

• binary
• binary_id
• decimal
• date
• time
• composite types