diff --git a/.rubocop.yml b/.rubocop.yml
index 26a1f499a..5bb235a61 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -217,6 +217,9 @@ Performance/EndWith:
 Performance/StartWith:
   Enabled: true
 
+Rails/ActiveRecordCallbacksOrder:
+  Enabled: true
+
 Rails/CreateTableWithTimestamps:
   Enabled: true
   Exclude:
@@ -270,6 +273,9 @@ Rails/OutputSafety:
   Exclude:
     - app/helpers/text_with_links_helper.rb
 
+Rails/PluckId:
+  Enabled: true
+
 Rails/PluralizationGrammar:
   Enabled: true
 
@@ -295,7 +301,7 @@ Rails/SaveBang:
 
 Rails/SkipsModelValidations:
   Enabled: true
-  Blacklist:
+  ForbiddenMethods:
     - update_attribute
   Exclude:
     - lib/acts_as_paranoid_aliases.rb
@@ -322,6 +328,12 @@ Rails/UnknownEnv:
 Rails/Validation:
   Enabled: true
 
+Rails/WhereEquals:
+  Enabled: true
+
+Rails/WhereNot:
+  Enabled: true
+
 RSpec/AroundBlock:
   Enabled: true
 
diff --git a/Gemfile b/Gemfile
index a79574002..21ac0174c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -109,7 +109,7 @@ group :development do
   gem "pronto-scss", "~> 0.11.0", require: false
   gem "rubocop", "~> 0.93.1", require: false
   gem "rubocop-performance", "~> 1.7.1", require: false
-  gem "rubocop-rails", "~> 2.6.0", require: false
+  gem "rubocop-rails", "~> 2.9.1", require: false
   gem "rubocop-rspec", "~> 1.44.1", require: false
   gem "rvm1-capistrano3", "~> 1.4.0", require: false
   gem "scss_lint", "~> 0.59.0", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 76368723a..c3b27accc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -555,10 +555,10 @@ GEM
       parser (>= 3.0.1.1)
     rubocop-performance (1.7.1)
       rubocop (>= 0.82.0)
-    rubocop-rails (2.6.0)
+    rubocop-rails (2.9.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
-      rubocop (>= 0.82.0)
+      rubocop (>= 0.90.0, < 2.0)
     rubocop-rspec (1.44.1)
       rubocop (~> 0.87)
       rubocop-ast (>= 0.7.1)
@@ -772,7 +772,7 @@ DEPENDENCIES
   rspec-rails (~> 4.0)
   rubocop (~> 0.93.1)
   rubocop-performance (~> 1.7.1)
-  rubocop-rails (~> 2.6.0)
+  rubocop-rails (~> 2.9.1)
   rubocop-rspec (~> 1.44.1)
   rvm1-capistrano3 (~> 1.4.0)
   sassc-rails (~> 2.1.2)
diff --git a/app/controllers/admin/stats_controller.rb b/app/controllers/admin/stats_controller.rb
index 577d90398..5f91ce61f 100644
--- a/app/controllers/admin/stats_controller.rb
+++ b/app/controllers/admin/stats_controller.rb
@@ -24,7 +24,7 @@ class Admin::StatsController < Admin::BaseController
                                                        .count(:voter_id)
 
     @user_ids_who_didnt_vote_proposals = @verified_users - @user_ids_who_voted_proposals
-    budgets_ids = Budget.where.not(phase: "finished").pluck(:id)
+    budgets_ids = Budget.where.not(phase: "finished").ids
     @budgets = budgets_ids.size
     @investments = Budget::Investment.where(budget_id: budgets_ids).count
   end
diff --git a/app/controllers/budgets/investments_controller.rb b/app/controllers/budgets/investments_controller.rb
index a06e68d1e..7c4101dad 100644
--- a/app/controllers/budgets/investments_controller.rb
+++ b/app/controllers/budgets/investments_controller.rb
@@ -44,7 +44,7 @@ module Budgets
     def index
       @investments = investments.page(params[:page]).per(PER_PAGE).for_render
 
-      @investment_ids = @investments.pluck(:id)
+      @investment_ids = @investments.ids
       @investments_map_coordinates = MapLocation.where(investment: investments).map(&:json_data)
 
       @tag_cloud = tag_cloud
diff --git a/app/controllers/dashboard_controller.rb b/app/controllers/dashboard_controller.rb
index 4ed198efa..85e4359ff 100644
--- a/app/controllers/dashboard_controller.rb
+++ b/app/controllers/dashboard_controller.rb
@@ -43,7 +43,7 @@ class DashboardController < Dashboard::BaseController
     end
 
     def set_done_and_pending_actions
-      @done_actions = proposed_actions.joins(:proposals).where("proposals.id = ?", proposal.id)
+      @done_actions = proposed_actions.joins(:proposals).where(proposals: { id: proposal.id })
       @pending_actions = proposed_actions - @done_actions
     end
 
diff --git a/app/controllers/officing/ballot_sheets_controller.rb b/app/controllers/officing/ballot_sheets_controller.rb
index afc885f61..55b6fcc77 100644
--- a/app/controllers/officing/ballot_sheets_controller.rb
+++ b/app/controllers/officing/ballot_sheets_controller.rb
@@ -47,7 +47,7 @@ class Officing::BallotSheetsController < Officing::BaseController
                   joins(:booth_assignment).
                   final.
                   where(id: current_user.poll_officer.officer_assignment_ids).
-                  where("poll_booth_assignments.poll_id = ?", @poll.id).
+                  where(poll_booth_assignments: { poll_id: @poll.id }).
                   where(date: Date.current)
     end
 
diff --git a/app/controllers/officing/results_controller.rb b/app/controllers/officing/results_controller.rb
index b0baf6b7d..6dbfe96ab 100644
--- a/app/controllers/officing/results_controller.rb
+++ b/app/controllers/officing/results_controller.rb
@@ -99,7 +99,7 @@ class Officing::ResultsController < Officing::BaseController
                   joins(:booth_assignment).
                   final.
                   where(id: current_user.poll_officer.officer_assignment_ids).
-                  where("poll_booth_assignments.poll_id = ?", @poll.id).
+                  where(poll_booth_assignments: { poll_id: @poll.id }).
                   where(date: Date.current)
     end
 
diff --git a/app/helpers/proposals_dashboard_helper.rb b/app/helpers/proposals_dashboard_helper.rb
index e96b2a3dd..a73b6d0ff 100644
--- a/app/helpers/proposals_dashboard_helper.rb
+++ b/app/helpers/proposals_dashboard_helper.rb
@@ -117,7 +117,7 @@ module ProposalsDashboardHelper
 
   def new_resources_since_last_login?(resources, new_actions_since_last_login)
     if resources.present?
-      resources.pluck(:id).any? { |id| new_actions_since_last_login.include?(id) }
+      resources.ids.any? { |id| new_actions_since_last_login.include?(id) }
     end
   end
 
diff --git a/app/models/budget/investment.rb b/app/models/budget/investment.rb
index 79f0e6cde..d490a3bf1 100644
--- a/app/models/budget/investment.rb
+++ b/app/models/budget/investment.rb
@@ -104,19 +104,19 @@ class Budget
     scope :for_render, -> { includes(:heading) }
 
     def self.by_valuator(valuator_id)
-      where("budget_valuator_assignments.valuator_id = ?", valuator_id).joins(:valuator_assignments)
+      where(budget_valuator_assignments: { valuator_id: valuator_id }).joins(:valuator_assignments)
     end
 
     def self.by_valuator_group(valuator_group_id)
       joins(:valuator_group_assignments).
-        where("budget_valuator_group_assignments.valuator_group_id = ?", valuator_group_id)
+        where(budget_valuator_group_assignments: { valuator_group_id: valuator_group_id })
     end
 
-    before_create :set_original_heading_id
-    before_save :calculate_confidence_score
-    after_save :recalculate_heading_winners
     before_validation :set_responsible_name
     before_validation :set_denormalized_ids
+    before_save :calculate_confidence_score
+    before_create :set_original_heading_id
+    after_save :recalculate_heading_winners
 
     def comments_count
       comments.count
@@ -164,10 +164,10 @@ class Budget
       results = results.winners            if params[:advanced_filters].include?("winners")
 
       ids = []
-      ids += results.valuation_finished_feasible.pluck(:id) if params[:advanced_filters].include?("feasible")
-      ids += results.where(selected: true).pluck(:id)       if params[:advanced_filters].include?("selected")
-      ids += results.undecided.pluck(:id)                   if params[:advanced_filters].include?("undecided")
-      ids += results.unfeasible.pluck(:id)                  if params[:advanced_filters].include?("unfeasible")
+      ids += results.valuation_finished_feasible.ids if params[:advanced_filters].include?("feasible")
+      ids += results.where(selected: true).ids       if params[:advanced_filters].include?("selected")
+      ids += results.undecided.ids                   if params[:advanced_filters].include?("undecided")
+      ids += results.unfeasible.ids                  if params[:advanced_filters].include?("unfeasible")
       results = results.where(id: ids) if ids.any?
       results
     end
@@ -191,8 +191,8 @@ class Budget
       return results if max_per_heading <= 0
 
       ids = []
-      budget.headings.pluck(:id).each do |hid|
-        ids += Investment.where(heading_id: hid).order(confidence_score: :desc).limit(max_per_heading).pluck(:id)
+      budget.headings.ids.each do |hid|
+        ids += Investment.where(heading_id: hid).order(confidence_score: :desc).limit(max_per_heading).ids
       end
 
       results.where(id: ids)
diff --git a/app/models/comment.rb b/app/models/comment.rb
index f6607a849..89e6c88f1 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -32,10 +32,8 @@ class Comment < ApplicationRecord
   before_save :calculate_confidence_score
 
   scope :for_render, -> { with_hidden.includes(user: :organization) }
-  scope :with_visible_author, -> { joins(:user).where("users.hidden_at IS NULL") }
-  scope :not_as_admin_or_moderator, -> do
-    where("administrator_id IS NULL").where("moderator_id IS NULL")
-  end
+  scope :with_visible_author, -> { joins(:user).where(users: { hidden_at: nil }) }
+  scope :not_as_admin_or_moderator, -> { where(administrator_id: nil).where(moderator_id: nil) }
   scope :sort_by_flags, -> { order(flags_count: :desc, updated_at: :desc) }
   scope :public_for_api, -> do
     not_valuations
diff --git a/app/models/concerns/followable.rb b/app/models/concerns/followable.rb
index 8a08d6809..7d6210369 100644
--- a/app/models/concerns/followable.rb
+++ b/app/models/concerns/followable.rb
@@ -6,7 +6,7 @@ module Followable
     has_many :followers, through: :follows, source: :user
 
     scope :followed_by_user, ->(user) {
-      joins(:follows).where("follows.user_id = ?", user.id)
+      joins(:follows).where(follows: { user_id: user.id })
     }
   end
 
diff --git a/app/models/concerns/randomizable.rb b/app/models/concerns/randomizable.rb
index 98a86b426..6b8299368 100644
--- a/app/models/concerns/randomizable.rb
+++ b/app/models/concerns/randomizable.rb
@@ -3,7 +3,7 @@ module Randomizable
 
   class_methods do
     def sort_by_random(seed = rand(10_000_000))
-      ids = order(:id).pluck(:id).shuffle(random: Random.new(seed))
+      ids = order(:id).ids.shuffle(random: Random.new(seed))
 
       return all if ids.empty?
 
diff --git a/app/models/dashboard/action.rb b/app/models/dashboard/action.rb
index 72340f0b8..f3734c0d0 100644
--- a/app/models/dashboard/action.rb
+++ b/app/models/dashboard/action.rb
@@ -86,10 +86,7 @@ class Dashboard::Action < ApplicationRecord
     actions_for_today = get_actions_for_today(proposal)
     actions_for_date = get_actions_for_date(proposal, date)
 
-    actions_for_today_ids = actions_for_today.pluck(:id)
-    actions_for_date_ids = actions_for_date.pluck(:id)
-
-    actions_for_today_ids - actions_for_date_ids
+    actions_for_today.ids - actions_for_date.ids
   end
 
   private
diff --git a/app/models/debate.rb b/app/models/debate.rb
index 47a78f360..7366249c6 100644
--- a/app/models/debate.rb
+++ b/app/models/debate.rb
@@ -45,7 +45,7 @@ class Debate < ApplicationRecord
   scope :sort_by_flags,            -> { order(flags_count: :desc, updated_at: :desc) }
   scope :sort_by_recommendations,  -> { order(cached_votes_total: :desc) }
   scope :last_week,                -> { where("created_at >= ?", 7.days.ago) }
-  scope :featured,                 -> { where("featured_at is not null") }
+  scope :featured,                 -> { where.not(featured_at: nil) }
   scope :public_for_api,           -> { all }
 
   # Ahoy setup
@@ -58,8 +58,7 @@ class Debate < ApplicationRecord
   end
 
   def self.recommendations(user)
-    tagged_with(user.interests, any: true)
-      .where("author_id != ?", user.id)
+    tagged_with(user.interests, any: true).where.not(author_id: user.id)
   end
 
   def searchable_translations_definitions
diff --git a/app/models/legislation/question.rb b/app/models/legislation/question.rb
index 73f1cc946..89515d943 100644
--- a/app/models/legislation/question.rb
+++ b/app/models/legislation/question.rb
@@ -22,11 +22,11 @@ class Legislation::Question < ApplicationRecord
   scope :sorted, -> { order("id ASC") }
 
   def next_question_id
-    @next_question_id ||= process.questions.where("id > ?", id).sorted.limit(1).pluck(:id).first
+    @next_question_id ||= process.questions.where("id > ?", id).sorted.limit(1).ids.first
   end
 
   def first_question_id
-    @first_question_id ||= process.questions.sorted.limit(1).pluck(:id).first
+    @first_question_id ||= process.questions.sorted.limit(1).ids.first
   end
 
   def answer_for_user(user)
diff --git a/app/models/milestone.rb b/app/models/milestone.rb
index 8401a3a86..0498d24c4 100644
--- a/app/models/milestone.rb
+++ b/app/models/milestone.rb
@@ -15,7 +15,7 @@ class Milestone < ApplicationRecord
 
   scope :order_by_publication_date, -> { order(publication_date: :asc, created_at: :asc) }
   scope :published,                 -> { where("publication_date <= ?", Date.current.end_of_day) }
-  scope :with_status,               -> { where("status_id IS NOT NULL") }
+  scope :with_status,               -> { where.not(status_id: nil) }
 
   def self.title_max_length
     80
diff --git a/app/models/poll.rb b/app/models/poll.rb
index 08e11f854..ac9fd07fc 100644
--- a/app/models/poll.rb
+++ b/app/models/poll.rb
@@ -45,7 +45,7 @@ class Poll < ApplicationRecord
   scope :current,  -> { where("starts_at <= ? and ? <= ends_at", Date.current.beginning_of_day, Date.current.beginning_of_day) }
   scope :expired,  -> { where("ends_at < ?", Date.current.beginning_of_day) }
   scope :recounting, -> { where(ends_at: (Date.current.beginning_of_day - RECOUNT_DURATION)..Date.current.beginning_of_day) }
-  scope :published, -> { where("published = ?", true) }
+  scope :published, -> { where(published: true) }
   scope :by_geozone_id, ->(geozone_id) { where(geozones: { id: geozone_id }.joins(:geozones)) }
   scope :public_for_api, -> { all }
   scope :not_budget, -> { where(budget_id: nil) }
@@ -122,7 +122,7 @@ class Poll < ApplicationRecord
   end
 
   def self.not_voted_by(user)
-    where("polls.id not in (?)", poll_ids_voted_by(user))
+    where.not(id: poll_ids_voted_by(user))
   end
 
   def self.poll_ids_voted_by(user)
diff --git a/app/models/proposal.rb b/app/models/proposal.rb
index 9fe469915..643c51de5 100644
--- a/app/models/proposal.rb
+++ b/app/models/proposal.rb
@@ -106,7 +106,7 @@ class Proposal < ApplicationRecord
 
   def self.recommendations(user)
     tagged_with(user.interests, any: true)
-      .where("author_id != ?", user.id)
+      .where.not(author_id: user.id)
       .unsuccessful
       .not_followed_by_user(user)
       .not_archived
@@ -114,7 +114,7 @@ class Proposal < ApplicationRecord
   end
 
   def self.not_followed_by_user(user)
-    where.not(id: followed_by_user(user).pluck(:id))
+    where.not(id: followed_by_user(user).ids)
   end
 
   def to_param
diff --git a/app/models/user.rb b/app/models/user.rb
index 75da22c3b..918667840 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -243,7 +243,7 @@ class User < ApplicationRecord
     Comment.hide_all comment_ids
     Proposal.hide_all proposal_ids
     Budget::Investment.hide_all budget_investment_ids
-    ProposalNotification.hide_all ProposalNotification.where(author_id: id).pluck(:id)
+    ProposalNotification.hide_all ProposalNotification.where(author_id: id).ids
   end
 
   def full_restore
diff --git a/app/models/verification/management/managed_user.rb b/app/models/verification/management/managed_user.rb
index 45ed1bbab..babf18f58 100644
--- a/app/models/verification/management/managed_user.rb
+++ b/app/models/verification/management/managed_user.rb
@@ -2,7 +2,7 @@ class Verification::Management::ManagedUser
   include ActiveModel::Model
 
   def self.find(document_type, document_number)
-    User.where("document_number is not null").
+    User.where.not(document_number: nil).
     find_or_initialize_by(document_type:   document_type,
                           document_number: document_number)
   end
diff --git a/db/dev_seeds/flags.rb b/db/dev_seeds/flags.rb
index ebddb901a..a31c0e550 100644
--- a/db/dev_seeds/flags.rb
+++ b/db/dev_seeds/flags.rb
@@ -1,19 +1,19 @@
 section "Flagging Debates & Comments" do
   40.times do
     debate = Debate.all.sample
-    flagger = User.where(["users.id <> ?", debate.author_id]).all.sample
+    flagger = User.where.not(id: debate.author_id).all.sample
     Flag.flag(flagger, debate)
   end
 
   40.times do
     comment = Comment.all.sample
-    flagger = User.where(["users.id <> ?", comment.user_id]).all.sample
+    flagger = User.where.not(id: comment.user_id).all.sample
     Flag.flag(flagger, comment)
   end
 
   40.times do
     proposal = Proposal.all.sample
-    flagger = User.where(["users.id <> ?", proposal.author_id]).all.sample
+    flagger = User.where.not(id: proposal.author_id).all.sample
     Flag.flag(flagger, proposal)
   end
 end
diff --git a/db/migrate/20171002103314_add_poll_shift_task_index.rb b/db/migrate/20171002103314_add_poll_shift_task_index.rb
index 3e28def56..8d283c7e1 100644
--- a/db/migrate/20171002103314_add_poll_shift_task_index.rb
+++ b/db/migrate/20171002103314_add_poll_shift_task_index.rb
@@ -1,6 +1,6 @@
 class AddPollShiftTaskIndex < ActiveRecord::Migration[4.2]
   def change
-    remove_index "poll_shifts", name: "index_poll_shifts_on_booth_id_and_officer_id"
+    remove_index "poll_shifts", column: [:booth_id, :officer_id]
     add_index :poll_shifts, :task
     add_index :poll_shifts, [:booth_id, :officer_id, :task], unique: true
   end
diff --git a/db/migrate/20171003095936_remove_officer_assigment_composed_index.rb b/db/migrate/20171003095936_remove_officer_assigment_composed_index.rb
index 62e4d12cf..16772972b 100644
--- a/db/migrate/20171003095936_remove_officer_assigment_composed_index.rb
+++ b/db/migrate/20171003095936_remove_officer_assigment_composed_index.rb
@@ -1,5 +1,5 @@
 class RemoveOfficerAssigmentComposedIndex < ActiveRecord::Migration[4.2]
   def change
-    remove_index "poll_officer_assignments", name: "index_poll_officer_assignments_on_officer_id_and_date"
+    remove_index "poll_officer_assignments", column: [:officer_id, :date]
   end
 end
diff --git a/db/migrate/20171003212958_add_date_to_poll_shift_composed_index.rb b/db/migrate/20171003212958_add_date_to_poll_shift_composed_index.rb
index 28c7e51ac..2b309b4bd 100644
--- a/db/migrate/20171003212958_add_date_to_poll_shift_composed_index.rb
+++ b/db/migrate/20171003212958_add_date_to_poll_shift_composed_index.rb
@@ -1,7 +1,7 @@
 class AddDateToPollShiftComposedIndex < ActiveRecord::Migration[4.2]
   def change
-    remove_index "poll_shifts", name: "index_poll_shifts_on_booth_id_and_officer_id_and_task"
-    remove_index "poll_shifts", name: "index_poll_shifts_on_task"
+    remove_index "poll_shifts", column: [:booth_id, :officer_id, :task]
+    remove_index "poll_shifts", :task
     add_index :poll_shifts, [:booth_id, :officer_id, :date, :task], unique: true
   end
 end
diff --git a/db/migrate/20190321144328_add_config_to_download_settings.rb b/db/migrate/20190321144328_add_config_to_download_settings.rb
index 74c650011..5a5404026 100644
--- a/db/migrate/20190321144328_add_config_to_download_settings.rb
+++ b/db/migrate/20190321144328_add_config_to_download_settings.rb
@@ -2,7 +2,7 @@ class AddConfigToDownloadSettings < ActiveRecord::Migration[4.2]
   def change
     add_column :download_settings, :config, :integer, default: 0, null: false
 
-    remove_index :download_settings, name: "index_download_settings_on_name_model_and_name_field"
+    remove_index :download_settings, column: [:name_model, :name_field]
     add_index :download_settings, [:name_model, :name_field, :config], unique: true
   end
 end