Class: Actor

Inherits:
ActiveRecord::Base
  • Object
show all
Includes:
SocialStream::Models::Object
Defined in:
app/models/actor.rb

Overview

An Actor represents a social entity. This means individuals, but also groups, departments, organizations even nations or states.

Actors are the nodes of a social network. Two actors are linked by Ties. The type of a Tie is a Relation. Each actor can define and customize their relations own Relations.

Every Actor has an Avatar, a Profile with personal or group information, contact data, etc.

Actors perform actions (like, suscribe, etc.) on activity objects (posts, commments, pictures, events..)

Actor subtypes

An actor subtype is called a Subject. SocialStream::Base provides two actor subtypes, User and Group, but the application developer can define as many actor subtypes as required. Besides including the SocialStream::Models::Subject module, Actor subtypes must added to config/initializers/social_stream.rb

Instance Method Summary collapse

Instance Method Details

#action_to(activity_object) ⇒ Object

Return the ActivityAction model to an ActivityObject



342
343
344
 
# File 'app/models/actor.rb', line 342

def action_to(activity_object)
  sent_actions.received_by(activity_object).first
end

#action_to!(activity_object) ⇒ Object

Return the ActivityAction model to an ActivityObject. Create it if it does not exist



347
348
349
350
 
# File 'app/models/actor.rb', line 347

def action_to!(activity_object)
  action_to(activity_object) ||
    sent_actions.create!(:activity_object => ActivityObject.normalize(activity_object))
end

#activity_relation_ids ⇒ Object

The ids of the default Relations for sharing an Activity owned by this Actor



420
421
422
 
# File 'app/models/actor.rb', line 420

def activity_relation_ids
  activity_relations.map(&:id)
end

#activity_relations ⇒ Object

The default Relations for sharing an Activity owned by this Actor



411
412
413
414
415
416
 
# File 'app/models/actor.rb', line 411

def activity_relations
  SocialStream.relation_model == :custom ?
    relations.
      allowing('read', 'activity') :
    [ Relation::Public.instance ]
end

#activity_relations_for(subject, options = {}) ⇒ Object

This method returns all the Relation that subject can choose to broadcast an Activity in this Actor‘s wall

See Activity on how they can be shared with multiple Audience, which corresponds to a Relation.



428
429
430
431
432
433
434
 
# File 'app/models/actor.rb', line 428

def activity_relations_for(subject, options = {})
  if Actor.normalize(subject) == self
    return relation_customs + Array.wrap(Relation::Public.instance)
  else
    Array.new
  end
end

#activity_relations_for?(subject, options = {}) ⇒ Boolean

Are #activity_relations available for subject?

Returns:

  • (Boolean) 


437
438
439
 
# File 'app/models/actor.rb', line 437

def activity_relations_for?(subject, options = {})
  activity_relations(subject, options).any?
end

#allow?(subject, action, object) ⇒ Boolean

Does this Actor allow subject to perform action on object?

Returns:

  • (Boolean) 


337
338
339
 
# File 'app/models/actor.rb', line 337

def allow?(subject, action, object)
  ties_to(subject).with_permissions(action, object).any?
end

#as_json(options) ⇒ Object 



482
483
484
485
486
487
488
489
490
491
492
 
# File 'app/models/actor.rb', line 482

def as_json(options)
  {
    id: id,
    slug: slug,
    name: name,
    url: options[:helper].polymorphic_url(subject),
    image: {
      url: options[:helper].root_url + .url(:small)
    }
  }
end

#as_object_type ⇒ Object

FIXME SocialStream::ActivityStreams::Supertype should take precedence over SocialStream::ActivityStreams::Subtype



146
147
148
 
# File 'app/models/actor.rb', line 146

def as_object_type
  subtype_instance.as_object_type
end

#can_comment?(activity) ⇒ Boolean

Is this Actor allowed to create a comment on activity?

We are allowing comments from everyone signed in by now

Returns:

  • (Boolean) 


444
445
446
447
448
 
# File 'app/models/actor.rb', line 444

def can_comment?(activity)
  return true

  comment_relations(activity).any?
end

#comment_relations(activity) ⇒ Object

Are there any relations that allow this actor to create a comment on activity?



451
452
453
454
 
# File 'app/models/actor.rb', line 451

def comment_relations(activity)
  activity.relations.select{ |r| r.is_a?(Relation::Public) } |
    Relation.allow(self, 'create', 'activity', :in => activity.relations)
end

#common_contacts_count(subject) ⇒ Object

Count the contacts in common between this Actor and subject



473
474
475
 
# File 'app/models/actor.rb', line 473

def common_contacts_count(subject)
  (sent_active_contact_ids & subject.sent_active_contact_ids).size
end

#contact_actors(options = {}) ⇒ Object

All the Actors this one has ties with:

actor.contact_actors #=> array of actors that sent and receive ties from actor

There are several options available to refine the query:

type

Filter by the class of the contacts (User, Group, etc.)

actor.contact_actors(:type => :user) #=> array of user actors. Exclude groups, etc.
direction

:sent leaves only the actors this one has ties to. :received gets the actors sending ties to this actor, whether this actor added them or not

actor.contact_actors(:direction => :sent) #=> all the receivers of ties from actor
relations

Restrict to ties made up with relations. In the case of both directions, only relations belonging to Actor are considered. It defaults to actor’s custom relations

actor.contact_actors(:relations => [2]) #=> actors tied with relation #2
include_self

False by default, do not include this actor even they have ties with themselves.

load_subjects

True by default, make the queries for eager loading of Subject



223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
 
# File 'app/models/actor.rb', line 223

def contact_actors(options = {})
  subject_types   = Array(options[:type] || self.class.subtypes)
  subject_classes = subject_types.map{ |s| s.to_s.classify }
  
  as = Actor.select('actors.*').
             # PostgreSQL requires that all the columns must be included in the GROUP BY
             group((Actor.columns.map(&:name).map{ |c| "actors.#{ c }" } + [ "contacts.created_at" ]).join(", ")).
             where('actors.subject_type' => subject_classes)

  if options[:load_subjects].nil? || options[:load_subjects]
    as = as.includes(subject_types)
  end
  
  # A blank :direction means reciprocate contacts, there must be ties in both directions
  #
  # This is achieved by getting the id of all the contacts that are sending ties
  # Then, we filter the sent contacts query to only those contacts
  if options[:direction].blank?
    rcv_opts = options.dup
    rcv_opts[:direction] = :received
    rcv_opts[:load_subjects] = false

    # Get the id of actors that are sending to this one
    sender_ids = contact_actors(rcv_opts).map(&:id)

    # Filter the sent query with these ids
    as = as.where(:id => sender_ids)

    options[:direction] = :sent
  end
  
  case options[:direction]
  when :sent
    as = as.joins(:received_ties => :relation).merge(Contact.sent_by(self))
  when :received
    as = as.joins(:sent_ties => :relation).merge(Contact.received_by(self))
  else
    raise "How do you get here?!"
  end
  
  if options[:include_self].blank?
    as = as.where("actors.id != ?", self.id)
  end
  
  if options[:relations].present?
    as = as.merge(Tie.related_by(options[:relations]))
  else
    as = as.merge(Relation.where(:type => ['Relation::Custom', 'Relation::Public']))
  end
  
  as
end

#contact_subjects(options = {}) ⇒ Object

All the subjects that send or receive at least one Tie to this Actor

When passing a block, it will be evaluated for building the actors query, allowing to add options before the mapping to subjects

See #contact_actors for options



282
283
284
285
286
287
288
289
290
 
# File 'app/models/actor.rb', line 282

def contact_subjects(options = {})
  as = contact_actors(options)
  
  if block_given?
    as = yield(as)
  end
  
  as.map(&:subject)
end

#contact_to(subject) ⇒ Object

Return a contact to subject.



298
299
300
 
# File 'app/models/actor.rb', line 298

def contact_to(subject)
  sent_contacts.received_by(subject).first
end

#contact_to!(subject) ⇒ Object

Return a contact to subject. Create it if it does not exist



303
304
305
306
 
# File 'app/models/actor.rb', line 303

def contact_to!(subject)
  contact_to(subject) ||
    sent_contacts.create!(:receiver => Actor.normalize(subject))
end

#egocentric_ties ⇒ Object

The ties sent by this actor, plus the second grade ties



391
392
393
394
 
# File 'app/models/actor.rb', line 391

def egocentric_ties
  @egocentric_ties ||=
    load_egocentric_ties
end

#following_actor_and_self_ids ⇒ Object

An array with the ids of Actors followed by this Actor plus the id from this Actor



332
333
334
 
# File 'app/models/actor.rb', line 332

def following_actor_and_self_ids
  following_actor_ids + [ id ]
end

#following_actor_ids ⇒ Object

An array with the ids of Actors followed by this Actor



323
324
325
326
327
328
 
# File 'app/models/actor.rb', line 323

def following_actor_ids
  following_actor_objects.
    includes(:actor).
    map(&:actor).
    map(&:id)
end

#following_actor_objects ⇒ Object

The ActivityObjects followed by this Actor that are Actors



317
318
319
320
 
# File 'app/models/actor.rb', line 317

def following_actor_objects
  followings.
    where('activity_objects.object_type' => "Actor")
end

#mailboxer_email(object) ⇒ Object

Returning the email address of the model if an email should be sent for this object (Message or Notification). If the actor is a Group and has no email address, an array with the email of the highest rank members will be returned isntead.

If no mail has to be sent, return nil.



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
 
# File 'app/models/actor.rb', line 155

def mailboxer_email(object)
  #If actor has disabled the emails, return nil.
  return nil if !notify_by_email
  #If actor has enabled the emails and has email
  return "#{name} <#{email}>" if email.present?
  #If actor is a Group, has enabled emails but no mail we return the highest_rank ones.
  if (group = self.subject).is_a? Group
    emails = Array.new
    group.relation_notifys.each do |relation|
      receivers = group.contact_actors(:direction => :sent, :relations => relation)
      receivers.each do |receiver|
        next unless Actor.normalize(receiver).subject_type.eql?("User")

        receiver_emails = receiver.mailboxer_email(object)
        case receiver_emails
        when String
          emails << receiver_emails
        when Array
          receiver_emails.each do |receiver_email|
            emails << receiver_email
          end
        end
      end
    end
  return emails
  end
end

#pending_contacts ⇒ Object

Build a new Contact from each that has not inverse



465
466
467
468
469
470
 
# File 'app/models/actor.rb', line 465

def pending_contacts
  received_contacts.pending.includes(:inverse).all.map do |c|
    c.inverse ||
      c.receiver.contact_to!(c.sender)
  end
end

#pending_contacts? ⇒ Boolean

Returns:

  • (Boolean) 


460
461
462
 
# File 'app/models/actor.rb', line 460

def pending_contacts?
  pending_contacts_count > 0
end

#pending_contacts_count ⇒ Object 



456
457
458
 
# File 'app/models/actor.rb', line 456

def pending_contacts_count
  received_contacts.not_reflexive.pending.count
end

#positive_sent_contact_actors ⇒ Object

The actors this one has established positive ties with



293
294
295
 
# File 'app/models/actor.rb', line 293

def positive_sent_contact_actors
  sent_contacts.joins(ties: :relation).merge(Relation.positive)
end

#relation_custom(name) ⇒ Object

A given relation defined and managed by this actor



194
195
196
 
# File 'app/models/actor.rb', line 194

def relation_custom(name)
  relation_customs.find_by_name(name)
end

#relation_customs ⇒ Object

All the relations defined by this Actor



189
190
191
 
# File 'app/models/actor.rb', line 189

def relation_customs
  relations.where(:type => 'Relation::Custom')
end

#relation_notifys ⇒ Object

All relations with the ‘notify’ permission



199
200
201
 
# File 'app/models/actor.rb', line 199

def relation_notifys
  relations.joins(:relation_permissions => :permission).where('permissions.action' => 'notify')
end

#represented_by?(subject) ⇒ Boolean

Can this actor be represented by subject. Does she has permissions for it?

Returns:

  • (Boolean) 


398
399
400
401
402
403
404
405
406
407
 
# File 'app/models/actor.rb', line 398

def represented_by?(subject)
  return false if subject.blank?

  self.class.normalize(subject) == self ||
    sent_ties.
      merge(Contact.received_by(subject)).
      joins(:relation => :permissions).
      merge(Permission.represent).
      any?
end

#self_contact ⇒ Object Also known as: ego_contact

The Contact of this Actor to self (totally close!)



309
310
311
 
# File 'app/models/actor.rb', line 309

def self_contact
  contact_to!(self)
end

#sent_active_contact_count ⇒ Object 



352
353
354
 
# File 'app/models/actor.rb', line 352

def sent_active_contact_count
  sent_contacts.active.count
end

#sent_active_contact_ids ⇒ Object 



356
357
358
359
 
# File 'app/models/actor.rb', line 356

def sent_active_contact_ids
  @sent_active_contact_ids ||=
    load_sent_active_contact_ids
end

#subject ⇒ Object

The subject instance for this actor



184
185
186
 
# File 'app/models/actor.rb', line 184

def subject
  subtype_instance
end

#suggestions(size = 1) ⇒ Contact

By now, it returns a suggested Contact to another Actor without any current Tie

Suggested actor types can be configured in SocialStream.suggestion_models in config/initializers/social_stream.rb

Returns:



367
368
369
370
371
372
373
374
375
376
377
378
 
# File 'app/models/actor.rb', line 367

def suggestions(size = 1)
  candidates =
    Actor.
      where(subject_type: SocialStream.suggested_models.map{ |m| m.to_s.classify }).
      where(Actor.arel_table[:id].not_in(sent_active_contact_ids + [id]))

  size.times.map {
    candidates.delete_at rand(candidates.size)
  }.compact.map { |a|
    contact_to! a
  }
end

#ties_to(subject) ⇒ Object

Set of ties sent by this actor received by subject



381
382
383
 
# File 'app/models/actor.rb', line 381

def ties_to(subject)
  sent_ties.merge(Contact.received_by(subject))
end

#ties_to?(subject) ⇒ Boolean

Is there any Tie sent by this actor and received by subject

Returns:

  • (Boolean) 


386
387
388
 
# File 'app/models/actor.rb', line 386

def ties_to?(subject)
  ties_to(subject).present?
end

#to_param ⇒ Object

Use slug as parameter



478
479
480
 
# File 'app/models/actor.rb', line 478

def to_param
  slug
end