Enable Style/RedundantSelf Rubocop cop

This cop checks for redundant uses of self. It supports autocorrection, so all the offenses where automatically solved.

Closes #1373

.rubocop.yml

@@ -76,6 +76,10 @@ Style/HashSyntax:
 Style/NilComparison:
   Enabled: true
 
+# Checks for redundant uses of self.
+Style/RedundantSelf:
+  Enabled: true
+
 # Use single quotes unless there's string interpolation
 Style/StringLiterals:
   Enabled: true

.rubocop_todo.yml

@@ -527,22 +527,6 @@ Style/RedundantReturn:
   Exclude:
     - 'app/helpers/application_helper.rb'
 
-# Offense count: 61
-# Cop supports --auto-correct.
-Style/RedundantSelf:
-  Exclude:
-    - 'app/models/ahoy/program.rb'
-    - 'app/models/call_for_paper.rb'
-    - 'app/models/cfp.rb'
-    - 'app/models/comment.rb'
-    - 'app/models/conference.rb'
-    - 'app/models/event.rb'
-    - 'app/models/program.rb'
-    - 'app/models/question.rb'
-    - 'app/models/ticket.rb'
-    - 'app/models/user.rb'
-    - 'app/models/venue.rb'
-
 # Offense count: 2
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, SupportedStyles, AllowInnerSlashes.

app/models/cfp.rb

@@ -16,11 +16,11 @@ class Cfp < ActiveRecord::Base
   # * +True+ -> If cfp dates is updated and all other parameters are set
   # * +False+ -> Either cfp date is not updated or one or more parameter is not set
   def notify_on_cfp_date_update?
-    !self.end_date.blank? && !self.start_date.blank?\
-    && (self.start_date_changed? || self.end_date_changed?)\
-    && self.program.conference.email_settings.send_on_cfp_dates_updated\
-    && !self.program.conference.email_settings.cfp_dates_updated_subject.blank?\
-    && !self.program.conference.email_settings.cfp_dates_updated_body.blank?
+    !end_date.blank? && !start_date.blank?\
+    && (start_date_changed? || end_date_changed?)\
+    && program.conference.email_settings.send_on_cfp_dates_updated\
+    && !program.conference.email_settings.cfp_dates_updated_subject.blank?\
+    && !program.conference.email_settings.cfp_dates_updated_body.blank?
   end
 
   ##
@@ -51,7 +51,7 @@ class Cfp < ActiveRecord::Base
   end
 
   def remaining_days(date = Date.today)
-    result = (self.end_date - date).to_i
+    result = (end_date - date).to_i
     result > 0 ? result : 0
   end
 

app/models/comment.rb

@@ -27,7 +27,7 @@ class Comment < ActiveRecord::Base
 
   #helper method to check if a comment has children
   def has_children?
-    self.children.any?
+    children.any?
   end
 
   # Helper class method to lookup all comments assigned

app/models/conference.rb

@@ -555,9 +555,9 @@ class Conference < ActiveRecord::Base
   # * +True+ -> If conference is updated and all other parameters are set
   # * +False+ -> Either conference is not updated or one or more parameter is not set
   def notify_on_dates_changed?
-    return false unless self.email_settings.send_on_conference_dates_updated
+    return false unless email_settings.send_on_conference_dates_updated
     # do not notify unless one of the dates changed
-    return false unless self.start_date_changed? || self.end_date_changed?
+    return false unless start_date_changed? || end_date_changed?
     # do not notify unless the mail content is set up
     (!email_settings.conference_dates_updated_subject.blank? && !email_settings.conference_dates_updated_body.blank?)
   end
@@ -569,9 +569,9 @@ class Conference < ActiveRecord::Base
   # * +True+ -> If registration dates is updated and all other parameters are set
   # * +False+ -> Either registration date is not updated or one or more parameter is not set
   def notify_on_registration_dates_changed?
-    return false unless self.email_settings.send_on_conference_registration_dates_updated
+    return false unless email_settings.send_on_conference_registration_dates_updated
     # do not notify unless we allow a registration
-    return false unless self.registration_period
+    return false unless registration_period
     # do not notify unless one of the dates changed
     return false unless registration_period.start_date_changed? || registration_period.end_date_changed?
     # do not notify unless the mail content is set up
@@ -628,8 +628,8 @@ class Conference < ActiveRecord::Base
   end
 
   after_create do
-    self.create_contact
-    self.create_program
+    create_contact
+    create_program
     create_roles
   end
 

app/models/event.rb

@@ -185,12 +185,12 @@ class Event < ActiveRecord::Base
     end
       begin
         if mail
-          self.send(transition,
-                    send_mail: send_mail_param)
+          send(transition,
+               send_mail: send_mail_param)
         else
-          self.send(transition)
+          send(transition)
         end
-        self.save
+        save
       rescue Transitions::InvalidTransition => e
         alert = "Update state failed. #{e.message}"
       end
@@ -210,12 +210,12 @@ class Event < ActiveRecord::Base
   # Returns +Hash+
   def progress_status
     {
-      registered: self.program.conference.user_registered?(self.submitter),
-      commercials: self.commercials.any?,
-      biography: !self.submitter.biography.blank?,
-      subtitle: !self.subtitle.blank?,
-      track: (!self.track.blank? unless self.program.tracks.empty?),
-      difficulty_level: !self.difficulty_level.blank?,
+      registered: program.conference.user_registered?(submitter),
+      commercials: commercials.any?,
+      biography: !submitter.biography.blank?,
+      subtitle: !subtitle.blank?,
+      track: (!track.blank? unless program.tracks.empty?),
+      difficulty_level: !difficulty_level.blank?,
       title: true,
       abstract: true
     }.with_indifferent_access
@@ -227,7 +227,7 @@ class Event < ActiveRecord::Base
   # ====Returns
   # * +String+ -> Progress in Percent
   def calculate_progress
-    result = self.progress_status
+    result = progress_status
     (100 * result.values.count(true) / result.values.compact.count).to_s
   end
 
@@ -280,8 +280,8 @@ class Event < ActiveRecord::Base
 
   def set_week
     self.week = created_at.strftime('%W')
-    self.without_versioning do
-      self.save!
+    without_versioning do
+      save!
     end
   end
 

app/models/program.rb

@@ -115,7 +115,7 @@ class Program < ActiveRecord::Base
   # * +false+ -> If rating is not enabled
   # * +true+ -> If rating is enabled
   def rating_enabled?
-    self.rating && self.rating > 0
+    rating && rating > 0
   end
 
   ##
@@ -139,7 +139,7 @@ class Program < ActiveRecord::Base
   end
 
   def languages_list
-    self.languages.split(',').map {|l| ISO_639.find(l).english_name} if self.languages.present?
+    languages.split(',').map {|l| ISO_639.find(l).english_name} if languages.present?
   end
 
   ##
@@ -161,10 +161,10 @@ class Program < ActiveRecord::Base
   def create_event_types
     EventType.create(title: 'Talk', length: 30, color: '#FF0000', description: 'Presentation in lecture format',
                      minimum_abstract_length: 0,
-                     maximum_abstract_length: 500, program_id: self.id)
+                     maximum_abstract_length: 500, program_id: id)
     EventType.create(title: 'Workshop', length: 60, color: '#0000FF', description: 'Interactive hands-on practice',
                      minimum_abstract_length: 0,
-                     maximum_abstract_length: 500, program_id: self.id)
+                     maximum_abstract_length: 500, program_id: id)
     true
   end
 
@@ -174,13 +174,13 @@ class Program < ActiveRecord::Base
   def create_difficulty_levels
     DifficultyLevel.create(title: 'Easy',
                            description: 'Events are understandable for everyone without knowledge of the topic.',
-                           color: '#70EF69', program_id: self.id)
+                           color: '#70EF69', program_id: id)
     DifficultyLevel.create(title: 'Medium',
                            description: 'Events require a basic understanding of the topic.',
-                           color: '#EEEF69', program_id: self.id)
+                           color: '#EEEF69', program_id: id)
     DifficultyLevel.create(title: 'Hard',
                            description: 'Events require expert knowledge of the topic.',
-                           color: '#EF6E69', program_id: self.id)
+                           color: '#EF6E69', program_id: id)
     true
   end
 
@@ -188,12 +188,12 @@ class Program < ActiveRecord::Base
   # Check if languages string has the right format. Used as validation.
   #
   def check_languages_format
-    return unless self.languages.present?
+    return unless languages.present?
     # All white spaces are removed to allow languages to be separated by ',' and ', '. The languages string without spaces is saved
-    self.languages = self.languages.delete(' ').downcase
+    self.languages = languages.delete(' ').downcase
     errors.add(:languages, 'must be two letters separated by commas') && return unless
-    self.languages.match(/^$|(\A[a-z][a-z](,[a-z][a-z])*\z)/).present?
-    languages_array = self.languages.split(',')
+    languages.match(/^$|(\A[a-z][a-z](,[a-z][a-z])*\z)/).present?
+    languages_array = languages.split(',')
     # We check that languages are not repeated
     errors.add(:languages, "can't be repeated") && return unless languages_array.uniq!.nil?
     # We check if every language is a valid ISO 639-1 language

app/models/question.rb

@@ -12,6 +12,6 @@ class Question < ActiveRecord::Base
   private
 
   def existing_answers
-    errors.add(:base, 'Must have answers') if self.answers.blank?
+    errors.add(:base, 'Must have answers') if answers.blank?
   end
 end

app/models/ticket.rb

@@ -66,7 +66,7 @@ class Ticket < ActiveRecord::Base
   private
 
   def tickets_of_conference_have_same_currency
-    unless Ticket.where(conference_id: conference_id).all?{|t| t.price_currency == self.price_currency }
+    unless Ticket.where(conference_id: conference_id).all?{|t| t.price_currency == price_currency }
       errors.add(:price_currency, 'is different from the existing tickets of this conference.')
     end
   end

app/models/user.rb

@@ -72,7 +72,7 @@ class User < ActiveRecord::Base
   # * +true+ if the user attended the event
   # * +false+ if the user did not attend the event
   def attended_event? event
-    event_registration = event.events_registrations.find_by(registration: self.registrations)
+    event_registration = event.events_registrations.find_by(registration: registrations)
 
     return false unless event_registration.present?
     event_registration.attended
@@ -91,7 +91,7 @@ class User < ActiveRecord::Base
   end
 
   def subscribed? conference
-    self.subscriptions.find_by(conference_id: conference.id).present?
+    subscriptions.find_by(conference_id: conference.id).present?
   end
 
   def supports? conference
@@ -206,8 +206,8 @@ class User < ActiveRecord::Base
   # Check if biography has an allowed number of words. Used as validation.
   #
   def biography_limit
-    if self.biography.present?
-      errors.add(:biography, 'is limited to 150 words.') if self.biography.split.length > 150
+    if biography.present?
+      errors.add(:biography, 'is limited to 150 words.') if biography.split.length > 150
     end
   end
 end

app/models/venue.rb

@@ -35,7 +35,7 @@ class Venue < ActiveRecord::Base
   def notify_on_venue_changed?
     return false unless conference.try(:email_settings).try(:send_on_venue_updated)
     # do not notify unless the address changed
-    return false unless self.name_changed? || self.street_changed? || self.city_changed? || self.country_changed?
+    return false unless name_changed? || street_changed? || city_changed? || country_changed?
     # do not notify unless the mail content is set up
     (!conference.email_settings.venue_updated_subject.blank? && !conference.email_settings.venue_updated_body.blank?)
   end