Module: ActiveAdmin::ResourceController::DataAccess

Included in:
ActiveAdmin::ResourceController
Defined in:
lib/active_admin/resource_controller/data_access.rb

Overview

This module overrides most of the data access methods in Inherited Resources to provide Active Admin with it’s data.

The module also deals with authorization and resource callbacks.

Constant Summary collapse

COLLECTION_APPLIES = 
[
  :authorization_scope,
  :sorting,
  :filtering,
  :scoping,
  :includes,
  :pagination,
  :collection_decorator
].freeze

Instance Method Summary collapse

Instance Method Details

#apply_authorization_scope(collection) ⇒ ActiveRecord::Relation (protected)

Gives the authorization library a change to pre-scope the collection.

In the case of the CanCan adapter, it calls ‘#accessible_by` on the collection.

Parameters:

  • collection (ActiveRecord::Relation) —

    The collection to scope

Returns:

  • (ActiveRecord::Relation) —

    a scoped collection of query



194
195
196
197
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 194

def apply_authorization_scope(collection)
  action_name = action_to_permission(params[:action])
  active_admin_authorization.scope_collection(collection, action_name)
end

#apply_decorations(resource) ⇒ ActiveRecord::Base (protected)

Returns resource.

Parameters:

  • resource (ActiveRecord::Base)

Returns:

  • (ActiveRecord::Base) —

    resource



296
297
298
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 296

def apply_decorations(resource)
  apply_decorator(resource)
end

#apply_filtering(chain) ⇒ Object (protected)

Applies any Ransack search methods to the currently scoped collection. Both ‘search` and `ransack` are provided, but we use `ransack` to prevent conflicts.



212
213
214
215
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 212

def apply_filtering(chain)
  @search = chain.ransack(params[:q] || {})
  @search.result
end

#apply_includes(chain) ⇒ Object (protected) 



227
228
229
230
231
232
233
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 227

def apply_includes(chain)
  if active_admin_config.includes.any?
    chain.includes *active_admin_config.includes
  else
    chain
  end
end

#apply_pagination(chain) ⇒ Object (protected) 



247
248
249
250
251
252
253
254
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 247

def apply_pagination(chain)
  # skip pagination if already was paginated by scope
  return chain if chain.respond_to?(:total_pages)
  page_method_name = Kaminari.config.page_method_name
  page = params[Kaminari.config.param_name]

  chain.public_send(page_method_name, page).per(per_page)
end

#apply_scoping(chain) ⇒ Object (protected) 



217
218
219
220
221
222
223
224
225
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 217

def apply_scoping(chain)
  @collection_before_scope = chain

  if current_scope
    scope_chain(current_scope, chain)
  else
    chain
  end
end

#apply_sorting(chain) ⇒ Object (protected) 



199
200
201
202
203
204
205
206
207
208
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 199

def apply_sorting(chain)
  params[:order] ||= active_admin_config.sort_order
  order_clause = active_admin_config.order_clause.new(active_admin_config, params[:order])

  if order_clause.valid?
    order_clause.apply(chain)
  else
    chain # just return the chain
  end
end

#assign_attributes(resource, attributes) ⇒ ActiveRecord::Base (protected)

Returns resource.

Parameters:

  • resource (ActiveRecord::Base)
  • attributes (Array<Hash]) —

    ttributes [Array<Hash]

Returns:

  • (ActiveRecord::Base) —

    resource



283
284
285
286
287
288
289
290
291
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 283

def assign_attributes(resource, attributes)
  if resource.respond_to?(:assign_attributes)
    resource.assign_attributes(*attributes)
  else
    resource.attributes = attributes[0]
  end

  resource
end

#build_new_resource ⇒ ActiveRecord::Base (protected)

Builds a new resource. This method uses the method_for_build provided by Inherited Resources.

Returns:

  • (ActiveRecord::Base) —

    An un-saved active record base object



129
130
131
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 129

def build_new_resource
  scoped_collection.send method_for_build, *resource_params
end

#build_resource ⇒ ActiveRecord::Base (protected)

Builds, memoize and authorize a new instance of the resource. The actual work of building the new instance is delegated to the #build_new_resource method.

This method is used to instantiate and authorize new resources in the new and create controller actions.

Returns:

  • (ActiveRecord::Base) —

    An un-saved active record base object



114
115
116
117
118
119
120
121
122
123
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 114

def build_resource
  get_resource_ivar || begin
    resource = build_new_resource
    resource = apply_decorations(resource)
    run_build_callbacks resource
    authorize_resource! resource

    set_resource_ivar resource
  end
end

#collection ⇒ ActiveRecord::Relation (protected)

Retrieve, memoize and authorize the current collection from the db. This method delegates the finding of the collection to #find_collection.

Once #collection has been called, the collection is available using either the @collection instance variable or an instance variable named after the resource that the collection is for. eg: Post => @post.

Returns:

  • (ActiveRecord::Relation) —

    The collection for the index



42
43
44
45
46
47
48
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 42

def collection
  get_collection_ivar || begin
    collection = find_collection
    authorize! Authorization::READ, active_admin_config.resource_class
    set_collection_ivar collection
  end
end

#collection_applies(options = {}) ⇒ Object (protected) 



256
257
258
259
260
261
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 256

def collection_applies(options = {})
  only   = Array(options.fetch(:only, COLLECTION_APPLIES))
  except = Array(options.fetch(:except, []))

  COLLECTION_APPLIES & only - except
end

#collection_before_scope ⇒ Object (protected) 



235
236
237
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 235

def collection_before_scope
  @collection_before_scope
end

#configured_per_page ⇒ Object (protected) 



275
276
277
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 275

def configured_per_page
  Array(active_admin_config.per_page).first
end

#create_resource(object) ⇒ void (protected)

This method returns an undefined value.

Calls all the appropriate callbacks and then creates the new resource.

Parameters:

  • object (ActiveRecord::Base) —

    The new resource to create



138
139
140
141
142
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 138

def create_resource(object)
  run_create_callbacks object do
    save_resource(object)
  end
end

#current_scope ⇒ Object (protected) 



239
240
241
242
243
244
245
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 239

def current_scope
  @current_scope ||= if params[:scope]
                       active_admin_config.get_scope_by_id(params[:scope])
                     else
                       active_admin_config.default_scope(self)
                     end
end

#destroy_resource(object) ⇒ void (protected)

This method returns an undefined value.

Destroys an object from the database and calls appropriate callbacks.



176
177
178
179
180
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 176

def destroy_resource(object)
  run_destroy_callbacks object do
    object.destroy
  end
end

#dynamic_per_page ⇒ Object (protected) 



271
272
273
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 271

def dynamic_per_page
  params[:per_page] || @per_page
end

#find_collection(options = {}) ⇒ ActiveRecord::Relation (protected)

Does the actual work of retrieving the current collection from the db. This is a great method to override if you would like to perform some additional db # work before your controller returns and authorizes the collection.

Returns:

  • (ActiveRecord::Relation) —

    The collection for the index



56
57
58
59
60
61
62
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 56

def find_collection(options = {})
  collection = scoped_collection
  collection_applies(options).each do |applyer|
    collection = send("apply_#{applyer}", collection)
  end
  collection
end

#find_resource ⇒ ActiveRecord::Base (protected)

Does the actual work of finding a resource in the database. This method uses the finder method as defined in InheritedResources.

Returns:

  • (ActiveRecord::Base) —

    An active record object.



102
103
104
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 102

def find_resource
  scoped_collection.send method_for_find, params[:id]
end

#per_page ⇒ Object (protected) 



263
264
265
266
267
268
269
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 263

def per_page
  if active_admin_config.paginate
    dynamic_per_page || configured_per_page
  else
    active_admin_config.max_per_page
  end
end

#resource ⇒ ActiveRecord::Base (protected)

Retrieve, memoize and authorize a resource based on params. The actual work of finding the resource is done in #find_resource.

This method is used on all the member actions:

* show
* edit
* update
* destroy

Returns:

  • (ActiveRecord::Base) —

    An active record object



88
89
90
91
92
93
94
95
96
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 88

def resource
  get_resource_ivar || begin
    resource = find_resource
    resource = apply_decorations(resource)
    authorize_resource! resource

    set_resource_ivar resource
  end
end

#save_resource(object) ⇒ void (protected)

This method returns an undefined value.

Calls all the appropriate callbacks and then saves the new resource.

Parameters:

  • object (ActiveRecord::Base) —

    The new resource to save



149
150
151
152
153
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 149

def save_resource(object)
  run_save_callbacks object do
    object.save
  end
end

#scoped_collection ⇒ Object (protected)

Override this method in your controllers to modify the start point of our searches and index.

This method should return an ActiveRecord::Relation object so that the searching and filtering can be applied on top

Note, unless you are doing something special, you should use the scope_to method from the Scoping module instead of overriding this method.



73
74
75
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 73

def scoped_collection
  end_of_association_chain
end

#smart_resource_url ⇒ String (protected)

Returns:

  • (String) 


301
302
303
304
305
306
307
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 301

def smart_resource_url
  if create_another?
    new_resource_url(create_another: params[:create_another])
  else
    super
  end
end

#update_resource(object, attributes) ⇒ void (protected)

This method returns an undefined value.

Update an object with the given attributes. Also calls the appropriate callbacks for update action.

Parameters:

  • object (ActiveRecord::Base) —

    The instance to update

  • attributes (Array) —

    An array with the attributes in the first position and the Active Record “role” in the second. The role may be set to nil.



165
166
167
168
169
170
171
 
# File 'lib/active_admin/resource_controller/data_access.rb', line 165

def update_resource(object, attributes)
  object = assign_attributes(object, attributes)

  run_update_callbacks object do
    save_resource(object)
  end
end