Class: GraphQL::Schema::Field::ConnectionExtension

Inherits:
GraphQL::Schema::FieldExtension show all
Defined in:
lib/graphql/schema/field/connection_extension.rb

Instance Attribute Summary

Attributes inherited from GraphQL::Schema::FieldExtension

#field, #options

Instance Method Summary collapse

Methods inherited from GraphQL::Schema::FieldExtension

#initialize

Constructor Details

This class inherits a constructor from GraphQL::Schema::FieldExtension

Instance Method Details

#after_resolve(value:, object:, arguments:, context:, memo:) ⇒ Object 



24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/graphql/schema/field/connection_extension.rb', line 24

def after_resolve(value:, object:, arguments:, context:, memo:)
  original_arguments = memo
  # rename some inputs to avoid conflicts inside the block
  maybe_lazy = value
  value = nil
  context.schema.after_lazy(maybe_lazy) do |resolved_value|
    value = resolved_value
    if value.is_a? GraphQL::ExecutionError
      # This isn't even going to work because context doesn't have ast_node anymore
      context.add_error(value)
      nil
    elsif value.nil?
      nil
    elsif value.is_a?(GraphQL::Pagination::Connection)
      # update the connection with some things that may not have been provided
      value.context ||= context
      value.parent ||= object.object
      value.first_value ||= original_arguments[:first]
      value.after_value ||= original_arguments[:after]
      value.last_value ||= original_arguments[:last]
      value.before_value ||= original_arguments[:before]
      value.arguments ||= original_arguments
      value.field ||= field
      if field.has_max_page_size? && !value.has_max_page_size_override?
        value.max_page_size = field.max_page_size
      end
      if context.schema.new_connections? && (custom_t = context.schema.connections.edge_class_for_field(@field))
        value.edge_class = custom_t
      end
      value
    elsif context.schema.new_connections?
      context.namespace(:connections)[:all_wrappers] ||= context.schema.connections.all_wrappers
      context.schema.connections.wrap(field, object.object, value, original_arguments, context)
    else
      if object.is_a?(GraphQL::Schema::Object)
        object = object.object
      end
      connection_class = GraphQL::Relay::BaseConnection.connection_for_nodes(value)
      connection_class.new(
        value,
        original_arguments,
        field: field,
        max_page_size: field.max_page_size,
        parent: object,
        context: context,
      )
    end
  end
end

#apply ⇒ Object 



7
8
9
10
11
12
 
# File 'lib/graphql/schema/field/connection_extension.rb', line 7

def apply
  field.argument :after, "String", "Returns the elements in the list that come after the specified cursor.", required: false
  field.argument :before, "String", "Returns the elements in the list that come before the specified cursor.", required: false
  field.argument :first, "Int", "Returns the first _n_ elements from the list.", required: false
  field.argument :last, "Int", "Returns the last _n_ elements from the list.", required: false
end

#resolve(object:, arguments:, context:) {|object, next_args, arguments| ... } ⇒ Object

Remove pagination args before passing it to a user method

Yields:



15
16
17
18
19
20
21
22
 
# File 'lib/graphql/schema/field/connection_extension.rb', line 15

def resolve(object:, arguments:, context:)
  next_args = arguments.dup
  next_args.delete(:first)
  next_args.delete(:last)
  next_args.delete(:before)
  next_args.delete(:after)
  yield(object, next_args, arguments)
end