Class: GraphQLIncludable::Resolver

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql_includable/resolver.rb

Class Method Summary collapse

Class Method Details

.figure_out_association(attribute_name, parent_model) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 182

def self.figure_out_association(attribute_name, parent_model)
  delegated_through = includes_delegated_through(parent_model, attribute_name)
  delegated_model = model_name_to_class(delegated_through.last) if delegated_through.present?
  association = (delegated_model || parent_model).reflect_on_association(attribute_name)
  association
end

.find_node_by_return_type(node, desired_return_type) ⇒ Object

Returns the first node in the tree which returns a specific type



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# File 'lib/graphql_includable/resolver.rb', line 48

def self.find_node_by_return_type(node, desired_return_type)
  return_type = node.return_type.unwrap.to_s
  return node if return_type == desired_return_type
  if node.respond_to?(:scoped_children)
    matching_node = nil
    node.scoped_children.values.each do |selections|
      matching_node = selections.values.find do |child_node|
        find_node_by_return_type(child_node, desired_return_type)
      end
      break if matching_node
    end
    matching_node
  end
end

.includes_delegated_through(base_model, method_name) ⇒ Object

If method_name is delegated from base_model, return an array of associations through which those methods can be delegated



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# File 'lib/graphql_includable/resolver.rb', line 191

def self.includes_delegated_through(base_model, method_name)
  chain = []
  method = method_name.to_sym
  model_name = base_model.instance_variable_get(:@delegate_cache).try(:[], method)
  while model_name
    chain << model_name
    model = model_name_to_class(model_name)
    model_name = model.instance_variable_get(:@delegate_cache).try(:[], method)
  end
  chain
end

.includes_for_child(node, parent_model, includes_manager) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 129

def self.includes_for_child(node, parent_model, includes_manager)
  associations = possible_associations(node, parent_model)

  if associations.present?
    if node_is_relay_connection?(node)
      includes_from_connection(node, parent_model, associations, includes_manager)
    else
      association = associations[:default] # should only be one
      child_includes_manager = includes_manager.add_child_include(association)
      includes_for_node(node, child_includes_manager)
    end
  end
end

.includes_for_node(node, includes_manager) ⇒ Object

Translate a node’s selections into includes values Combine and format children values Noop on nodes that don’t return AR (so no associations to include)



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# File 'lib/graphql_includable/resolver.rb', line 66

def self.includes_for_node(node, includes_manager)
  return_model = node_return_model(node)
  return [] if return_model.blank?

  children = node.scoped_children[node.return_type.unwrap]

  children.each_value do |child_node|
    includes_for_child(child_node, return_model, includes_manager)
  end
end

.includes_from_connection(node, parent_model, associations_from_parent_model, includes_manager) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 77

def self.includes_from_connection(node, parent_model, associations_from_parent_model, includes_manager)
  return unless node.return_type.fields['edges'].edge_class <= GraphQLIncludable::Relay::EdgeWithNode  # TODO: Possibly basic support for connections with only nodes

  edges_association = associations_from_parent_model[:edges]
  nodes_association = associations_from_parent_model[:nodes]

  edge_node_attribute = node.return_type.fields['edges'].metadata[:edge_to_node_property]
  edge_model = edges_association.klass
  edge_to_node_association = edge_model.reflect_on_association(edge_node_attribute)
  node_model = edge_to_node_association.klass

  connection_children = node.scoped_children[node.return_type.unwrap]
  connection_children.each_value do |connection_node|
    # connection_field {
    #   pageInfo {...}
    #   nodes {
    #     node_model_field ...
    #   }
    #   edges {
    #     edge_model_field ...
    #     node {
    #       node_model_field ...
    #     }
    #   }
    # }

    if connection_node.name == 'edges'
      edges_includes_manager = includes_manager.add_child_include(edges_association)

      edge_children = connection_node.scoped_children[connection_node.return_type.unwrap]
      edge_children.each_value do |edge_child_node|
        if edge_child_node.name == 'node'
          node_includes_manager = edges_includes_manager.add_child_include(edge_to_node_association)

          node_children = edge_child_node.scoped_children[edge_child_node.return_type.unwrap]
          node_children.each_value do |node_child_node|
            includes_for_child(node_child_node, node_model, node_includes_manager)
          end
        else
          includes_for_child(edge_child_node, edge_model, edges_includes_manager)
        end
      end
    elsif connection_node.name == 'nodes'
      nodes_includes_manager = includes_manager.add_child_include(nodes_association)
      node_children = connection_node.scoped_children[connection_node.return_type.unwrap]
      node_children.each_value do |node_child_node|
        includes_for_child(node_child_node, node_model, nodes_includes_manager)
      end
    end
  end
end

.model_name_to_class(model_name) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 143

def self.model_name_to_class(model_name)
  begin
    model_name.to_s.camelize.constantize
  rescue NameError
    model_name.to_s.singularize.camelize.constantize
  end
rescue
end

.node_is_relay_connection?(node) ⇒ Boolean

Returns:



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# File 'lib/graphql_includable/resolver.rb', line 159

def self.node_is_relay_connection?(node)
  node.return_type.unwrap.name =~ /Connection$/
end

.node_possible_association_names(node) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 168

def self.node_possible_association_names(node)
  definition = node.definitions.first

  association_names = {}
  if node_is_relay_connection?(node)
    association_names[:edges] = definition.metadata[:edges_property] if definition.metadata.key?(:edges_property)
    association_names[:nodes] = definition.metadata[:nodes_property] if definition.metadata.key?(:nodes_property)
    return association_names if association_names.present? # This should be an includable connection with no :property or name fallback.
  end

  association_names[:default] = definition.metadata[:includes] || (definition.property || definition.name).to_sym
  association_names
end

.node_return_model(node) ⇒ Object

Translate a node’s return type to an ActiveRecord model



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# File 'lib/graphql_includable/resolver.rb', line 153

def self.node_return_model(node)
  model = Object.const_get(node.return_type.unwrap.name.gsub(/(^SquareFoot|Edge$|Connection$)/, ''))
  model if model < ActiveRecord::Base
rescue NameError
end

.possible_associations(node, parent_model) ⇒ Object 



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# File 'lib/graphql_includable/resolver.rb', line 163

def self.possible_associations(node, parent_model)
  attribute_names = node_possible_association_names(node)
  attribute_names.transform_values { |attribute_name| figure_out_association(attribute_name, parent_model) }.compact
end