Class: Grape::API

Inherits:
Object
  • Object
show all
Extended by:
ActiveSupport::Autoload
Defined in:
lib/grape/api.rb,
lib/grape.rb,
lib/grape/api/helpers.rb,
lib/grape/api/instance.rb,
lib/grape/validations/validators/coerce.rb

Overview

The API class is the primary entry point for creating Grape APIs. Users should subclass this class in order to build an API.

Defined Under Namespace

Modules: Helpers Classes: Instance

Constant Summary collapse

NON_OVERRIDABLE =

Class methods that we want to call on the API rather than on the API object

(Class.new.methods + %i[call call!]).freeze
Boolean = 
Virtus::Attribute::Boolean

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.base_instance ⇒ Object

Returns the value of attribute base_instance.



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# File 'lib/grape/api.rb', line 12

def base_instance
  @base_instance
end

.instances ⇒ Object

Returns the value of attribute instances.



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# File 'lib/grape/api.rb', line 12

def instances
  @instances
end

Class Method Details

.call(*args, &block) ⇒ Object

This is the interface point between Rack and Grape; it accepts a request from Rack and ultimately returns an array of three values: the status, the headers, and the body. See [the rack specification] (www.rubydoc.info/github/rack/rack/master/file/SPEC) for more. NOTE: This will only be called on an API directly mounted on RACK



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# File 'lib/grape/api.rb', line 50

def call(*args, &block)
  base_instance.call(*args, &block)
end

.const_missing(*args) ⇒ Object

Alleviates problems with autoloading by tring to search for the constant



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# File 'lib/grape/api.rb', line 64

def const_missing(*args)
  if base_instance.const_defined?(*args)
    base_instance.const_get(*args)
  elsif parent && parent.const_defined?(*args)
    parent.const_get(*args)
  else
    super
  end
end

.inherited(api, base_instance_parent = Grape::API::Instance) ⇒ Object

When inherited, will create a list of all instances (times the API was mounted) It will listen to the setup required to mount that endpoint, and replicate it on any new instance



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# File 'lib/grape/api.rb', line 21

def inherited(api, base_instance_parent = Grape::API::Instance)
  api.initial_setup(base_instance_parent)
  api.override_all_methods!
  make_inheritable(api)
end

.initial_setup(base_instance_parent) ⇒ Object

Initialize the instance variables on the remountable class, and the base_instance an instance that will be used to create the set up but will not be mounted



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# File 'lib/grape/api.rb', line 29

def initial_setup(base_instance_parent)
  @instances = []
  @setup = []
  @base_parent = base_instance_parent
  @base_instance = mount_instance
end

.make_inheritable(api) ⇒ Object

Allows an API to itself be inheritable:



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# File 'lib/grape/api.rb', line 55

def make_inheritable(api)
  # When a child API inherits from a parent API.
  def api.inherited(child_api)
    # The instances of the child API inherit from the instances of the parent API
    Grape::API.inherited(child_api, base_instance)
  end
end

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



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# File 'lib/grape/api.rb', line 102

def method_missing(method, *args, &block)
  # If there's a missing method, it may be defined on the base_instance instead.
  if respond_to_missing?(method)
    base_instance.send(method, *args, &block)
  else
    super
  end
end

.mount_instance(opts = {}) ⇒ Object

The remountable class can have a configuration hash to provide some dynamic class-level variables. For instance, a descripcion could be done using: ‘desc configuration` if it may vary depending on where the endpoint is mounted. Use with care, if you find yourself using configuration too much, you may actually want to provide a new API rather than remount it.



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# File 'lib/grape/api.rb', line 78

def mount_instance(opts = {})
  instance = Class.new(@base_parent)
  instance.configuration = opts[:configuration] || {}
  instance.base = self
  replay_setup_on(instance)
  instance
end

.new(*args, &block) ⇒ Object

Rather than initializing an object of type Grape::API, create an object of type Instance



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# File 'lib/grape/api.rb', line 15

def new(*args, &block)
  base_instance.new(*args, &block)
end

.override_all_methods! ⇒ Object

Redefines all methods so that are forwarded to add_setup and be recorded



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# File 'lib/grape/api.rb', line 37

def override_all_methods!
  (base_instance.methods - NON_OVERRIDABLE).each do |method_override|
    define_singleton_method(method_override) do |*args, &block|
      add_setup(method_override, *args, &block)
    end
  end
end

.replay_setup_on(instance) ⇒ Object

Replays the set up to produce an API as defined in this class, can be called on classes that inherit from Grape::API



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# File 'lib/grape/api.rb', line 88

def replay_setup_on(instance)
  @setup.each do |setup_stage|
    instance.send(setup_stage[:method], *setup_stage[:args], &setup_stage[:block])
  end
end

.respond_to?(method, include_private = false) ⇒ Boolean

Returns:



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# File 'lib/grape/api.rb', line 94

def respond_to?(method, include_private = false)
  super(method, include_private) || base_instance.respond_to?(method, include_private)
end

.respond_to_missing?(method, include_private = false) ⇒ Boolean

Returns:



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# File 'lib/grape/api.rb', line 98

def respond_to_missing?(method, include_private = false)
  base_instance.respond_to?(method, include_private)
end