Hello ^^, I’m creating a API with Absinthe, I’m having many arguments that are being duplicated again and again, so I would like to implement a macro that calls that argument that they have all in common, for example change this:
field :person, :person do
arg(:slug, non_null(:string))
arg(
:language,
:query_language,
description: "A large description",
default_value: :en
)
end
field :company, :company do
arg(:slug, non_null(:string))
arg(
:language,
:query_language,
description: "A large description",
default_value: :en
)
end
to something like this:
field :person, :person do
arg(:slug, non_null(:string))
get_language_argument()
end
field :company, :company do
arg(:slug, non_null(:string))
get_language_argument()
end
So the get_language_argument(), return the arg macro, is that possible?
Yeah I already tried it, but I get a compilation error
** (Absinthe.Schema.Notation.Error) Invalid schema notation: `arg` must only be used within `directive`, `field`
lib/absinthe/schema/notation.ex:1463: Absinthe.Schema.Notation.do_recordable!/4
expanding macro: Absinthe.Schema.Notation.arg/3
lib/okami/schema.ex:176: Okami.Schema.get_language_argument/0
(elixir) lib/kernel/parallel_compiler.ex:198: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/6
Oh well yeah, there is no need for a macro if a function will work ^^’
What you want is to return AST that contains the arg macro you’re trying to inject.
defmacro get_language_argument do
quote do
arg(
:language,
:query_language,
description: "A large description",
default_value: :en
)
end
end
As far as the implied use case goes, unless it’s very common to request different fields in different languages I would consider setting a more global language flag in the context and just using that, instead of specifying it on every field.
