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 non-fractional signed whole numeric value. By default it is not compliant with the GraphQl Specification, it can represent values between -(2^53 - 1) and 2^53 - 1 as specified by IEEE 754. To use the GraphQl compliant Int, representing values between -2^31 and 2^31 - 1, in your schema use Absinthe.Schema, use_spec_compliant_int_scalar: true.
• :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.

Built-in custom types

Note that absinthe includes a few generic extra scalar types in Absinthe.Type.Custom, these are not part of the GraphQL spec thus they must be explicitly imported. Consider using them before implementing a custom type.

Example

Supporting ISO8601 week date format, using Timex:

scalar :iso_week_date do
  description "ISO8601 week date (ex: 2022-W42-2)"
  parse &Timex.parse(&1, "{YYYY}-W{Wiso}-{WDmon}")
  serialize &Timex.format!(&1, "{YYYY}-W{Wiso}-{WDmon}")
end