Module: RESTFramework::BaseControllerMixin

Included in:
BaseModelControllerMixin
Defined in:
lib/rest_framework/controller_mixins/base.rb

Overview

This module provides the common functionality for any controller mixins, a ‘root` action, and the ability to route arbitrary actions with `extra_actions`. This is also where `api_response` is defined.

Defined Under Namespace

Modules: ClassMethods

Constant Summary collapse

RRF_BASE_CONTROLLER_CONFIG = 
{
  filter_pk_from_request_body: true,
  exclude_body_fields: [
    :created_at, :created_by, :created_by_id, :updated_at, :updated_by, :updated_by_id
  ].freeze,
  extra_actions: nil,
  extra_member_actions: nil,
  filter_backends: nil,
  singleton_controller: nil,

  # Options related to metadata and display.
  title: nil,
  description: nil,
  inflect_acronyms: ["ID", "IDs", "REST", "API", "APIs"].freeze,

  # Options related to serialization.
  rescue_unknown_format_with: :json,
  serializer_class: nil,
  serialize_to_json: true,
  serialize_to_xml: true,

  # Options related to pagination.
  paginator_class: nil,
  page_size: 20,
  page_query_param: "page",
  page_size_query_param: "page_size",
  max_page_size: nil,

  # Options related to bulk actions and batch processing.
  bulk_guard_query_param: nil,
  enable_batch_processing: nil,

  # Option to disable serializer adapters by default, mainly introduced because Active Model
  # Serializers will do things like serialize `[]` into `{"":[]}`.
  disable_adapters_by_default: true,
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 141

def self.included(base)
  return unless base.is_a?(Class)

  base.extend(ClassMethods)

  # Add class attributes (with defaults) unless they already exist.
  RRF_BASE_CONTROLLER_CONFIG.each do |a, default|
    next if base.respond_to?(a)

    base.class_attribute(a)

    # Set default manually so we can still support Rails 4. Maybe later we can use the default
    # parameter on `class_attribute`.
    base.send(:"#{a}=", default)
  end

  # Alias `extra_actions` to `extra_collection_actions`.
  unless base.respond_to?(:extra_collection_actions)
    base.alias_method(:extra_collection_actions, :extra_actions)
    base.alias_method(:extra_collection_actions=, :extra_actions=)
  end

  # Skip CSRF since this is an API.
  begin
    base.skip_before_action(:verify_authenticity_token)
  rescue
    nil
  end

  # Handle some common exceptions.
  unless RESTFramework.config.disable_rescue_from
    base.rescue_from(
      ActionController::ParameterMissing,
      ActionController::UnpermittedParameters,
      ActiveRecord::AssociationTypeMismatch,
      ActiveRecord::NotNullViolation,
      ActiveRecord::RecordNotFound,
      ActiveRecord::RecordInvalid,
      ActiveRecord::RecordNotSaved,
      ActiveRecord::RecordNotDestroyed,
      ActiveRecord::RecordNotUnique,
      ActiveModel::UnknownAttributeError,
      with: :rrf_error_handler,
    )
  end

  # Use `TracePoint` hook to automatically call `rrf_finalize`.
  unless RESTFramework.config.disable_auto_finalize
    # :nocov:
    TracePoint.trace(:end) do |t|
      next if base != t.self

      base.rrf_finalize

      # It's important to disable the trace once we've found the end of the base class definition,
      # for performance.
      t.disable
    end
    # :nocov:
  end
end

Instance Method Details

#api_response(payload, html_kwargs: nil, **kwargs) ⇒ Object

Render a browsable API for ‘html` format, along with basic `json`/`xml` formats, and with support or passing custom `kwargs` to the underlying `render` calls.



266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 266

def api_response(payload, html_kwargs: nil, **kwargs)
  html_kwargs ||= {}
  json_kwargs = kwargs.delete(:json_kwargs) || {}
  xml_kwargs = kwargs.delete(:xml_kwargs) || {}

  # Raise helpful error if payload is nil. Usually this happens when a record is not found (e.g.,
  # when passing something like `User.find_by(id: some_id)` to `api_response`). The caller should
  # actually be calling `find_by!` to raise ActiveRecord::RecordNotFound and allowing the REST
  # framework to catch this error and return an appropriate error response.
  if payload.nil?
    raise RESTFramework::NilPassedToAPIResponseError
  end

  # If `payload` is an `ActiveRecord::Relation` or `ActiveRecord::Base`, then serialize it.
  if payload.is_a?(ActiveRecord::Base) || payload.is_a?(ActiveRecord::Relation)
    payload = self.serialize(payload)
  end

  # Do not use any adapters by default, if configured.
  if self.class.disable_adapters_by_default && !kwargs.key?(:adapter)
    kwargs[:adapter] = nil
  end

  # Flag to track if we had to rescue unknown format.
  already_rescued_unknown_format = false

  begin
    respond_to do |format|
      if payload == ""
        format.json { head(kwargs[:status] || :no_content) } if self.class.serialize_to_json
        format.xml { head(kwargs[:status] || :no_content) } if self.class.serialize_to_xml
      else
        format.json {
          jkwargs = kwargs.merge(json_kwargs)
          render(json: payload, layout: false, **jkwargs)
        } if self.class.serialize_to_json
        format.xml {
          xkwargs = kwargs.merge(xml_kwargs)
          render(xml: payload, layout: false, **xkwargs)
        } if self.class.serialize_to_xml
        # TODO: possibly support more formats here if supported?
      end
      format.html {
        @payload = payload
        if payload == ""
          @json_payload = "" if self.class.serialize_to_json
          @xml_payload = "" if self.class.serialize_to_xml
        else
          @json_payload = payload.to_json if self.class.serialize_to_json
          @xml_payload = payload.to_xml if self.class.serialize_to_xml
        end
        @template_logo_text ||= "Rails REST Framework"
        @title ||= self.class.get_title
        @description ||= self.class.description
        @route_props, @route_groups = RESTFramework::Utils.get_routes(
          Rails.application.routes, request
        )
        hkwargs = kwargs.merge(html_kwargs)
        begin
          render(**hkwargs)
        rescue ActionView::MissingTemplate  # Fallback to `rest_framework` layout.
          hkwargs[:layout] = "rest_framework"
          hkwargs[:html] = ""
          render(**hkwargs)
        end
      }
    end
  rescue ActionController::UnknownFormat
    if !already_rescued_unknown_format && rescue_format = self.class.rescue_unknown_format_with
      request.format = rescue_format
      already_rescued_unknown_format = true
      retry
    else
      raise
    end
  end
end

#get_filter_backends ⇒ Object

Get filtering backends, defaulting to no backends.



227
228
229
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 227

def get_filter_backends
  return self.class.filter_backends || []
end

#get_filtered_data(data) ⇒ Object

Filter an arbitrary data set over all configured filter backends.



232
233
234
235
236
237
238
239
240
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 232

def get_filtered_data(data)
  # Apply each filter sequentially.
  self.get_filter_backends.each do |filter_class|
    filter = filter_class.new(controller: self)
    data = filter.get_filtered_data(data)
  end

  return data
end

#get_options_metadata ⇒ Object 



242
243
244
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 242

def get_options_metadata
  return self.class.get_options_metadata
end

#get_serializer_class ⇒ Object

Get the configured serializer class.



204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 204

def get_serializer_class
  return nil unless serializer_class = self.class.serializer_class

  # Support dynamically resolving serializer given a symbol or string.
  serializer_class = serializer_class.to_s if serializer_class.is_a?(Symbol)
  if serializer_class.is_a?(String)
    serializer_class = self.class.const_get(serializer_class)
  end

  # Wrap it with an adapter if it's an active_model_serializer.
  if defined?(ActiveModel::Serializer) && (serializer_class < ActiveModel::Serializer)
    serializer_class = RESTFramework::ActiveModelSerializerAdapterFactory.for(serializer_class)
  end

  return serializer_class
end

#options ⇒ Object

Provide a generic ‘OPTIONS` response with metadata such as available actions.



345
346
347
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 345

def options
  return api_response(self.get_options_metadata)
end

#root ⇒ Object

Default action for API root.



47
48
49
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 47

def root
  api_response({message: "This is the API root."})
end

#rrf_error_handler(e) ⇒ Object 



246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 246

def rrf_error_handler(e)
  status = case e
  when ActiveRecord::RecordNotFound
    404
  else
    400
  end

  return api_response(
    {
      message: e.message,
      errors: e.try(:record).try(:errors),
      exception: RESTFramework.config.show_backtrace ? e.full_message : nil,
    }.compact,
    status: status,
  )
end

#serialize(data, **kwargs) ⇒ Object

Serialize the given data using the ‘serializer_class`.



222
223
224
 
# File 'lib/rest_framework/controller_mixins/base.rb', line 222

def serialize(data, **kwargs)
  return self.get_serializer_class.new(data, controller: self, **kwargs).serialize
end