Class: GraphQL::Schema::BuildFromDefinition::ResolveMap::DefaultResolve Private

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/schema/build_from_definition/resolve_map/default_resolve.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Instance Method Summary collapse

Constructor Details

#initialize(field_map, field_name) ⇒ DefaultResolve

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of DefaultResolve.



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# File 'lib/graphql/schema/build_from_definition/resolve_map/default_resolve.rb', line 7

def initialize(field_map, field_name)
  @field_map = field_map
  @field_name = field_name
end

Instance Method Details

#call(obj, args, ctx) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Make some runtime checks about how obj implements the field_name.

Create a new resolve function according to that implementation, then:

  • update field_map with this implementation
  • call the implementation now (to satisfy this field execution)

If obj doesn't implement field_name, raise an error.



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# File 'lib/graphql/schema/build_from_definition/resolve_map/default_resolve.rb', line 20

def call(obj, args, ctx)
  method_name = @field_name
  if !obj.respond_to?(method_name)
    raise KeyError, "Can't resolve field #{method_name} on #{obj}"
  else
    method_arity = obj.method(method_name).arity
    resolver = case method_arity
    when 0, -1
      # -1 Handles method_missing, eg openstruct
      ->(o, a, c) { o.public_send(method_name) }
    when 1
      ->(o, a, c) { o.public_send(method_name, a) }
    when 2
      ->(o, a, c) { o.public_send(method_name, a, c) }
    else
      raise "Unexpected resolve arity: #{method_arity}. Must be 0, 1, 2"
    end
    # Call the resolver directly next time
    @field_map[method_name] = resolver
    # Call through this time
    resolver.call(obj, args, ctx)
  end
end