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The extension for building GraphQL APIs with Ash
Current section
Files
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Files
lib/resource/query.ex
defmodule AshGraphql.Resource.Query do
@moduledoc "Represents a configured query on a resource"
defstruct [
:name,
:action,
:type,
:identity,
:allow_nil?,
:modify_resolution,
as_mutation?: false,
metadata_names: [],
metadata_types: [],
show_metadata: nil,
type_name: nil,
relay?: false
]
@query_schema [
name: [
type: :atom,
doc: "The name to use for the query.",
default: :get
],
action: [
type: :atom,
doc: "The action to use for the query.",
required: true
],
type_name: [
type: :atom,
doc: """
Override the type name returned by this query. Must be set if the read action has `metadata`.
To ignore any action metadata, set this to the same type the resource uses, or set `show_metadata` to `[]`.
To show metadata in the response, choose a new name here, like `:user_with_token` to get a response type that
includes the additional fields.
"""
],
metadata_names: [
type: :keyword_list,
default: [],
doc: "Name overrides for metadata fields on the read action."
],
metadata_types: [
type: :keyword_list,
default: [],
doc: "Type overrides for metadata fields on the read action."
],
show_metadata: [
type: {:list, :atom},
doc: "The metadata attributes to show. Defaults to all."
],
as_mutation?: [
type: :boolean,
default: false,
doc: """
Places the query in the `mutations` key instead. The use cases for this are likely very minimal.
If you have a query that needs to modify the graphql context using `modify_resolution`, then you
should likely set this as well. A simple example might be a `log_in`, which could be a read
action on the user that accepts an email/password, and should then set some context in the graphql
inside of `modify_resolution`. Once in the context, you can see the guide referenced in `modify_resolution`
for more on setting the session or a cookie with an auth token.
"""
]
]
@get_schema [
identity: [
type: :atom,
doc:
"The identity to use for looking up the record. Pass `false` to not use an identity.",
required: false
],
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the action can return nil."
],
modify_resolution: [
type: :mfa,
doc: """
An MFA that will be called with the resolution, the query, and the result of the action as the first three arguments (followed by the arguments in the mfa).
Must return a new absinthe resolution. This can be used to implement things like setting cookies based on resource actions. A method of using resolution context
for that is documented here: https://hexdocs.pm/absinthe_plug/Absinthe.Plug.html#module-before-send
*Important* if you are modifying the context, then you should also set `as_mutation?` to true and represent
this in your graphql as a mutation. See `as_mutation?` for more.
"""
]
]
|> Spark.OptionsHelpers.merge_schemas(@query_schema, "Shared Query Options")
@read_one_schema [
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the action can return nil."
]
]
|> Spark.OptionsHelpers.merge_schemas(@query_schema, "Shared Query Options")
@list_schema [
relay?: [
type: :boolean,
default: false,
doc: """
If true, the graphql queries/resolvers for this resource will be built to honor the [relay specification](https://relay.dev/graphql/connections.htm).
The two changes that are made currently are:
* the type for the resource will implement the `Node` interface
* pagination over that resource will behave as a Connection.
"""
]
]
|> Spark.OptionsHelpers.merge_schemas(@query_schema, "Shared Query Options")
def get_schema, do: @get_schema
def read_one_schema, do: @read_one_schema
def list_schema, do: @list_schema
end