Craft GraphQL APIs in Elixir with Absinthe

Union

Description

Represents an object that could be one of a list of GraphQL object types, but provides for no guaranteed fields between those types. They also differ from interfaces in that object types declare what interfaces they implement, but are not aware of what unions contain them.

Absinthe Macro

union

Examples

In an Absinthe schema, defining the union and mapping results to the associated GraphQL type:

@desc "A search result"
union :search_result do
  types [:person, :business]
  resolve_type fn
    %Person{}, _ ->
      :person
    %Business{}, _ ->
      :business
    _, _ ->
      nil
  end
end