Class: GQL::Node

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

Defined Under Namespace

Classes: ExecutionContext

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ast_node, target, variables, context) ⇒ Node

Returns a new instance of Node.



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# File 'lib/gql/node.rb', line 138

def initialize(ast_node, target, variables, context)
  @ast_node, @target = ast_node, target
  @variables, @context = variables, context
end

Instance Attribute Details

#ast_node ⇒ Object (readonly)

Returns the value of attribute ast_node.



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# File 'lib/gql/node.rb', line 136

def ast_node
  @ast_node
end

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/gql/node.rb', line 136

def context
  @context
end

#target ⇒ Object (readonly)

Returns the value of attribute target.



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# File 'lib/gql/node.rb', line 136

def target
  @target
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/gql/node.rb', line 136

def variables
  @variables
end

Class Method Details

.build_class(id, proc, options = {}) ⇒ Object 



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# File 'lib/gql/node.rb', line 27

def build_class(id, proc, options = {})
  Class.new(self).tap do |field_class|
    field_class.id = id.to_s
    field_class.proc = proc
  end
end

.call(id, *args) ⇒ Object 



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# File 'lib/gql/node.rb', line 34

def call(id, *args)
  if id.is_a? Hash
    id.each do |name, call_class|
      call name, call_class
    end
  else
    options = args.extract_options!

    proc_or_class = args.shift || -> (*pargs) { target.public_send(id, *pargs) }
    result_class = options[:returns] || proc_or_class.try(:result_class)

    if result_class.is_a? ::Array
      if result_class.size == 1
        result_class.unshift GQL.default_list_class || Connection
      end

      options = {
        list_class: result_class.first,
        item_class: result_class.last
      }

      result_class = Connection.build_class(:result, nil, options)
    elsif result_class
      Node.validate_is_subclass! result_class, 'result'
    end

    call_class =
      if proc_or_class.is_a? Proc
        Class.new(Call).tap do |klass|
          klass.class_eval do
            self.proc = proc_or_class

            def execute(*args)
              instance_exec(*args, &self.class.proc)
            end
          end

          self.const_set "#{id.to_s.camelize}Call", klass
        end
      else
        proc_or_class
      end

    call_class.id = id.to_s
    call_class.result_class = result_class

    self.calls = calls.merge(id.to_sym => call_class)
  end
end

.cursor(id_or_proc) ⇒ Object 



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# File 'lib/gql/node.rb', line 97

def cursor(id_or_proc)
  id = id_or_proc.is_a?(Proc) ? nil : id_or_proc
  proc = id ? -> { target.public_send(id) } : id_or_proc

  field :cursor, proc, type: Raw
end

.field(id, *args) ⇒ Object 



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# File 'lib/gql/node.rb', line 84

def field(id, *args)
  options = args.extract_options!
  proc    = args.shift || instance_exec(id, &default_proc)
  type    = options.delete(:type) || Node

  Node.validate_is_subclass! type, 'type'

  type.build_class(id, proc, options).tap do |field_class|
    self.const_set "#{id.to_s.camelize}Field", field_class
    self.fields = fields.merge(id.to_sym => field_class)
  end
end

.method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/gql/node.rb', line 118

def method_missing(method, *args, &block)
  if type = GQL.field_types[method]
    Node.define_singleton_method method do |*margs, &mblock|
      options = margs.extract_options!.merge(type: type)
      margs = margs.push(options)

      field(*margs, &mblock)
    end

    send method, *args, &block
  else
    super
  end
rescue NoMethodError
  raise Errors::UndefinedFieldType, method
end

.respond_to?(method, *args) ⇒ Boolean

Returns:



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# File 'lib/gql/node.rb', line 114

def respond_to?(method, *args)
  super || GQL.field_types.has_key?(method)
end

.validate_is_subclass!(subclass, name) ⇒ Object 



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# File 'lib/gql/node.rb', line 104

def validate_is_subclass!(subclass, name)
  if subclass.nil?
    raise Errors::UndefinedNodeClass.new(self, name)
  end

  unless subclass <= self
    raise Errors::InvalidNodeClass.new(subclass, self)
  end
end

Instance Method Details

#raw_value ⇒ Object 



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# File 'lib/gql/node.rb', line 191

def raw_value
  nil
end

#value ⇒ Object 



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# File 'lib/gql/node.rb', line 143

def value
  if ast_call = ast_node.call
    value_of_call ast_call
  elsif ast_fields = ast_node.fields
    value_of_fields ast_fields
  else
    raw_value
  end
end

#value_of_call(ast_call) ⇒ Object 



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# File 'lib/gql/node.rb', line 153

def value_of_call(ast_call)
  call_class = self.class.calls[ast_call.id]

  if call_class.nil?
    raise Errors::UndefinedCall.new(ast_call.id, self.class)
  end

  call_class.execute(self.class, ast_call, target, variables, context)
end

#value_of_field(ast_field) ⇒ Object 



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# File 'lib/gql/node.rb', line 171

def value_of_field(ast_field)
  case ast_field.id
  when :node
    field = self.class.new(ast_field, target, variables, context)
    field.value
  else
    field_class = self.class.fields[ast_field.id]

    if field_class.nil?
      raise Errors::UndefinedField.new(ast_field.id, self.class)
    end

    method = ExecutionContext.new(target, context)
    target = method.execute(field_class.proc)

    field = field_class.new(ast_field, target, variables, context)
    field.value
  end
end

#value_of_fields(ast_fields) ⇒ Object 



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# File 'lib/gql/node.rb', line 163

def value_of_fields(ast_fields)
  ast_fields.reduce({}) do |result, ast_field|
    key = ast_field.alias_id || ast_field.id

    result.merge key => value_of_field(ast_field)
  end
end