Module: Grape::DSL::RequestResponse::ClassMethods

Defined in:
lib/grape/dsl/request_response.rb

Instance Method Summary collapse

Instance Method Details

#content_type(key, val) ⇒ Object

Specify additional content-types, e.g.:

content_type :xls, 'application/vnd.ms-excel'



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# File 'lib/grape/dsl/request_response.rb', line 65

def content_type(key, val)
  namespace_stackable(:content_types, key.to_sym => val)
end

#content_types ⇒ Object

All available content types.



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# File 'lib/grape/dsl/request_response.rb', line 70

def content_types
  c_types = namespace_stackable_with_hash(:content_types)
  Grape::ContentTypes.content_types_for c_types
end

#default_error_formatter(new_formatter_name = nil) ⇒ Object

Specify a default error formatter.



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# File 'lib/grape/dsl/request_response.rb', line 44

def default_error_formatter(new_formatter_name = nil)
  if new_formatter_name
    new_formatter = Grape::ErrorFormatter.formatter_for(new_formatter_name, {})
    namespace_inheritable(:default_error_formatter, new_formatter)
  else
    namespace_inheritable(:default_error_formatter)
  end
end

#default_error_status(new_status = nil) ⇒ Object

Specify the default status code for errors.



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# File 'lib/grape/dsl/request_response.rb', line 76

def default_error_status(new_status = nil)
  namespace_inheritable(:default_error_status, new_status)
end

#default_format(new_format = nil) ⇒ Object

Specify the default format for the API’s serializers. May be ‘:json` or `:txt` (default).



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# File 'lib/grape/dsl/request_response.rb', line 13

def default_format(new_format = nil)
  namespace_inheritable(:default_format, new_format.nil? ? nil : new_format.to_sym)
end

#error_formatter(format, options) ⇒ Object 



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# File 'lib/grape/dsl/request_response.rb', line 53

def error_formatter(format, options)
  formatter = if options.is_a?(Hash) && options.key?(:with)
                options[:with]
              else
                options
              end

  namespace_stackable(:error_formatters, format.to_sym => formatter)
end

#format(new_format = nil) ⇒ Object

Specify the format for the API’s serializers. May be ‘:json`, `:xml`, `:txt`, etc.



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# File 'lib/grape/dsl/request_response.rb', line 19

def format(new_format = nil)
  if new_format
    namespace_inheritable(:format, new_format.to_sym)
    # define the default error formatters
    namespace_inheritable(:default_error_formatter, Grape::ErrorFormatter.formatter_for(new_format, {}))
    # define a single mime type
    mime_type = content_types[new_format.to_sym]
    raise Grape::Exceptions::MissingMimeType.new(new_format) unless mime_type
    namespace_stackable(:content_types, new_format.to_sym => mime_type)
  else
    namespace_inheritable(:format)
  end
end

#formatter(content_type, new_formatter) ⇒ Object

Specify a custom formatter for a content-type.



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# File 'lib/grape/dsl/request_response.rb', line 34

def formatter(content_type, new_formatter)
  namespace_stackable(:formatters, content_type.to_sym => new_formatter)
end

#parser(content_type, new_parser) ⇒ Object

Specify a custom parser for a content-type.



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# File 'lib/grape/dsl/request_response.rb', line 39

def parser(content_type, new_parser)
  namespace_stackable(:parsers, content_type.to_sym => new_parser)
end

#represent(model_class, options) ⇒ Object

Allows you to specify a default representation entity for a class. This allows you to map your models to their respective entities once and then simply call ‘present` with the model.

Note that Grape will automatically go up the class ancestry to try to find a representing entity, so if you, for example, define an entity to represent ‘Object` then all presented objects will bubble up and utilize the entity provided on that `represent` call.

Examples:

class ExampleAPI < Grape::API
  represent User, with: Entity::User

  get '/me' do
    present current_user # with: Entity::User is assumed
  end
end

Parameters:

  • model_class (Class) —

    The model class that will be represented.

  • options (Hash) —

    a customizable set of options

Options Hash (options):

  • :with (Class) —

    The entity class that will represent the model.

Raises:



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# File 'lib/grape/dsl/request_response.rb', line 154

def represent(model_class, options)
  raise Grape::Exceptions::InvalidWithOptionForRepresent.new unless options[:with] && options[:with].is_a?(Class)
  namespace_stackable(:representations, model_class => options[:with])
end

#rescue_from(*exception_classes, **options) ⇒ Object

Allows you to rescue certain exceptions that occur to return a grape error rather than raising all the way to the server level.

Examples:

Rescue from custom exceptions

class ExampleAPI < Grape::API
  class CustomError < StandardError; end

  rescue_from CustomError
end

Parameters:

  • exception_classes (Array) —

    A list of classes that you want to rescue, or the symbol :all to rescue from all exceptions.

  • block (Block) —

    Execution block to handle the given exception.

  • options (Hash) —

    Options for the rescue usage.

  • handler (Proc) —

    Execution proc to handle the given exception as an alternative to passing a block.

Options Hash (**options):

  • :backtrace (Boolean) —

    Include a backtrace in the rescue response.

  • :rescue_subclasses (Boolean) —

    Also rescue subclasses of exception classes



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# File 'lib/grape/dsl/request_response.rb', line 100

def rescue_from(*args, &block)
  if args.last.is_a?(Proc)
    handler = args.pop
  elsif block_given?
    handler = block
  end

  options = args.extract_options!
  if block_given? && options.key?(:with)
    raise ArgumentError, 'both :with option and block cannot be passed'
  end
  handler ||= extract_with(options)

  if args.include?(:all)
    namespace_inheritable(:rescue_all, true)
    namespace_inheritable :all_rescue_handler, handler
  elsif args.include?(:grape_exceptions)
    namespace_inheritable(:rescue_all, true)
    namespace_inheritable(:rescue_grape_exceptions, true)
  else
    handler_type =
      case options[:rescue_subclasses]
      when nil, true
        :rescue_handlers
      else
        :base_only_rescue_handlers
      end

    namespace_reverse_stackable handler_type, Hash[args.map { |arg| [arg, handler] }]
  end

  namespace_stackable(:rescue_options, options)
end