Class: GraphQL::Relay::RangeAdd

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/relay/range_add.rb

Overview

This provides some isolation from GraphQL::Relay internals.

Given a list of items and a new item, it will provide a connection and an edge.

The connection doesn’t receive outside arguments, so the list of items should be ordered and paginated before providing it here.

Examples:

Adding a comment to list of comments

post = Post.find(args[:post_id])
comments = post.comments
new_comment = comments.build(body: args[:body])
new_comment.save!

range_add = GraphQL::Relay::RangeAdd.new(
  parent: post,
  collection: comments,
  item: new_comment,
  context: context,
)

response = {
  post: post,
  comments_connection: range_add.connection,
  new_comment_edge: range_add.edge,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(collection:, item:, parent: nil, context: nil, edge_class: nil) ⇒ RangeAdd

Returns a new instance of RangeAdd.

Parameters:

  • collection (Object)

    The list of items to wrap in a connection

  • item (Object)

    The newly-added item (will be wrapped in edge_class)

  • parent (Object) (defaults to: nil)

    The owner of collection, will be passed to the connection if provided

  • context (GraphQL::Query::Context) (defaults to: nil)

    The surrounding ctx, will be passed to the connection if provided (this is required for cursor encoders)

  • edge_class (Class) (defaults to: nil)

    The class to wrap item with (defaults to the connection’s edge class)



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
# File 'lib/graphql/relay/range_add.rb', line 37

def initialize(collection:, item:, parent: nil, context: nil, edge_class: nil)
  if context && context.schema.new_connections?
    conn_class = context.schema.connections.wrapper_for(collection)
    # The rest will be added by ConnectionExtension
    @connection = conn_class.new(collection, parent: parent, context: context, edge_class: edge_class)
    # Check if this connection supports it, to support old versions of GraphQL-Pro
    @edge = if @connection.respond_to?(:range_add_edge)
      @connection.range_add_edge(item)
    else
      @connection.edge_class.new(item, @connection)
    end
  else
    connection_class = BaseConnection.connection_for_nodes(collection)
    @connection = connection_class.new(collection, {}, parent: parent, context: context)
    edge_class ||= Relay::Edge
    @edge = edge_class.new(item, @connection)
  end

  @parent = parent
end

Instance Attribute Details

#connectionObject (readonly)

Returns the value of attribute connection.



30
31
32
# File 'lib/graphql/relay/range_add.rb', line 30

def connection
  @connection
end

#edgeObject (readonly)

Returns the value of attribute edge.



30
31
32
# File 'lib/graphql/relay/range_add.rb', line 30

def edge
  @edge
end

#parentObject (readonly)

Returns the value of attribute parent.



30
31
32
# File 'lib/graphql/relay/range_add.rb', line 30

def parent
  @parent
end