Class: GraphQL::InternalRepresentation::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/internal_representation/node.rb

Constant Summary collapse

DEFAULT_TYPED_CHILDREN =

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

Proc.new { |h, k| h[k] = {} }
NO_TYPED_CHILDREN =

A specialized, reusable object for leaf nodes.

Hash.new({}.freeze)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name:, owner_type:, query:, return_type:, parent:, ast_nodes: [], definitions: []) ⇒ Node

Returns a new instance of Node.



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# File 'lib/graphql/internal_representation/node.rb', line 65

def initialize(
    name:, owner_type:, query:, return_type:, parent:,
    ast_nodes: [],
    definitions: []
  )
  @name = name
  @query = query
  @owner_type = owner_type
  @parent = parent
  @typed_children = nil
  @scoped_children = Hash.new { |h1, k1| h1[k1] = {} }
  @ast_nodes = ast_nodes
  @definitions = definitions
  @return_type = return_type
end

Instance Attribute Details

#ast_nodes ⇒ Array<Language::Nodes::AbstractNode> (readonly)

Returns AST nodes which are represented by this node.

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 54

def ast_nodes
  @ast_nodes
end

#definitions ⇒ Array<GraphQL::Field> (readonly)

Returns Field definitions for this node (there should only be one!).

Returns:

  • (Array<GraphQL::Field>) —

    Field definitions for this node (there should only be one!)



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# File 'lib/graphql/internal_representation/node.rb', line 57

def definitions
  @definitions
end

#name ⇒ String (readonly)

Returns the name this node has in the response.

Returns:

  • (String) —

    the name this node has in the response



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# File 'lib/graphql/internal_representation/node.rb', line 14

def name
  @name
end

#owner_type ⇒ GraphQL::ObjectType

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 17

def owner_type
  @owner_type
end

#parent ⇒ InternalRepresentation::Node?

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 63

def parent
  @parent
end

#query ⇒ GraphQL::Query (readonly)

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 158

def query
  @query
end

#return_type ⇒ GraphQL::BaseType (readonly)

Returns The expected wrapped type this node must return.

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 60

def return_type
  @return_type
end

#scoped_children ⇒ Hash<GraphQL::BaseType, Hash<String => Node>> (readonly)

These children correspond closely to scopes in the AST. Keys may be abstract types. They're assumed to be read-only after rewrite is finished because #typed_children is derived from them.

Using #scoped_children during the rewrite step reduces the overhead of reifying abstract types because they're only reified after the rewrite.

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 51

def scoped_children
  @scoped_children
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 94

def ==(other)
  other.is_a?(self.class) &&
    other.name == name &&
    other.parent == parent &&
    other.return_type == return_type &&
    other.owner_type == owner_type &&
    other.scoped_children == scoped_children &&
    other.definitions == definitions &&
    other.ast_nodes == ast_nodes
end

#arguments ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 109

def arguments
  @query.arguments_for(self, definition)
end

#ast_node ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 120

def ast_node
  @ast_node ||= ast_nodes.first
end

#deep_merge_node(new_parent, scope: nil, merge_self: true) ⇒ Object

Merge selections from new_parent into self. Selections are merged in place, not copied.



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# File 'lib/graphql/internal_representation/node.rb', line 132

def deep_merge_node(new_parent, scope: nil, merge_self: true)
  if merge_self
    @ast_nodes |= new_parent.ast_nodes
    @definitions |= new_parent.definitions
  end
  new_sc = new_parent.scoped_children
  if new_sc.any?
    scope ||= Scope.new(@query, @return_type.unwrap)
    new_sc.each do |obj_type, new_fields|
      inner_scope = scope.enter(obj_type)
      inner_scope.each do |scoped_type|
        prev_fields = @scoped_children[scoped_type]
        new_fields.each do |name, new_node|
          prev_node = prev_fields[name]
          if prev_node
            prev_node.deep_merge_node(new_node)
          else
            prev_fields[name] = new_node
          end
        end
      end
    end
  end
end

#definition ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 113

def definition
  @definition ||= begin
    first_def = @definitions.first
    first_def && @query.get_field(@owner_type, first_def.name)
  end
end

#definition_name ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 105

def definition_name
  definition && definition.name
end

#initialize_copy(other_node) ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 81

def initialize_copy(other_node)
  super
  # Bust some caches:
  @typed_children = nil
  @definition = nil
  @definition_name = nil
  @ast_node = nil
  # Shallow-copy some state:
  @scoped_children = other_node.scoped_children.dup
  @ast_nodes = other_node.ast_nodes.dup
  @definitions = other_node.definitions.dup
end

#inspect ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 124

def inspect
  all_children_names = scoped_children.values.map(&:keys).flatten.uniq.join(", ")
  all_locations = ast_nodes.map {|n| "#{n.line}:#{n.col}" }.join(", ")
  "#<Node #{@owner_type}.#{@name} -> #{@return_type} {#{all_children_names}} @ [#{all_locations}] #{object_id}>"
end

#subscription_topic ⇒ Object 



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# File 'lib/graphql/internal_representation/node.rb', line 160

def subscription_topic
  @subscription_topic ||= begin
    scope = if definition.subscription_scope
      @query.context[definition.subscription_scope]
    else
      nil
    end
    Subscriptions::Event.serialize(
      definition_name,
      @query.arguments_for(self, definition),
      definition,
      scope: scope
    )
  end
end

#typed_children ⇒ Hash<GraphQL::ObjectType, Hash<String => Node>>

Each key is a ObjectType which this selection may be made on. The values for that key are selections which apply to that type.

This value is derived from #scoped_children after the rewrite is finished.

Returns:



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# File 'lib/graphql/internal_representation/node.rb', line 24

def typed_children
  @typed_children ||= begin
    if @scoped_children.any?
      new_tc = Hash.new(&DEFAULT_TYPED_CHILDREN)
      all_object_types = Set.new
      scoped_children.each_key { |t| all_object_types.merge(@query.possible_types(t)) }
      # Remove any scoped children which don't follow this return type
      # (This can happen with fragment merging where lexical scope is lost)
      all_object_types &= @query.possible_types(@return_type.unwrap)
      all_object_types.each do |t|
        new_tc[t] = get_typed_children(t)
      end
      new_tc
    else
      NO_TYPED_CHILDREN
    end

  end
end