absinthe v1.5.2 Absinthe.Type.Scalar View Source

Represents a primitive value.

GraphQL responses take the form of a hierarchical tree; the leaves on these trees are scalars.

Also see Absinthe.Type.Object.

Built-In Scalars

The following built-in scalar types are defined:

  • :boolean - Represents true or false. See the GraphQL Specification.
  • :float - Represents signed double‐precision fractional values as specified by IEEE 754. See the GraphQL Specification.
  • :id - Represents a unique identifier, often used to refetch an object or as key for a cache. The ID type is serialized in the same way as a String; however, it is not intended to be human‐readable. See the GraphQL Specification.
  • :integer - Represents a signed 32‐bit numeric non‐fractional value, greater than or equal to -2^31 and less than 2^31. Note that Absinthe uses the full word :integer to identify this type, but its name (used by variables, for instance), is "Int". See the GraphQL Specification.
  • :string - Represents textual data, represented as UTF‐8 character sequences. The String type is most often used by GraphQL to represent free‐form human‐readable text. See the GraphQL Specification.

Examples

Supporting a time format in ISOz format, using Timex:

scalar :time do
  description "Time (in ISOz format)"
  parse &Timex.DateFormat.parse(&1, "{ISOz}")
  serialize &Timex.DateFormat.format!(&1, "{ISOz}")
end

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Types

t()

A defined scalar type.

The internal, canonical representation of a scalar value

Functions

Callback implementation for c:Absinthe.Introspection.Kind.kind/0.

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t()

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t() :: %Absinthe.Type.Scalar{
  __private__: Keyword.t(),
  __reference__: Absinthe.Type.Reference.t(),
  definition: module(),
  description: binary(),
  identifier: atom(),
  name: binary(),
  parse: term(),
  serialize: term()
}

A defined scalar type.

Note new scalars should be defined using Absinthe.Schema.Notation.scalar.

  • :name - The name of scalar. Should be a TitleCased binary. Set Automatically by Absinthe.Schema.Notation.scalar.
  • :description - A nice description for introspection.
  • :serialize - A function used to convert a value to a form suitable for JSON serialization
  • :parse - A function used to convert the raw, incoming form of a scalar to the canonical internal format.

The :__private__ and :__reference__ keys are for internal use.

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value_t()

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value_t() :: any()

The internal, canonical representation of a scalar value

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Callback implementation for c:Absinthe.Introspection.Kind.kind/0.

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parse(type, value, context \\ %{})

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