diff --git a/app/controllers/users/sessions_controller.rb b/app/controllers/users/sessions_controller.rb
index 046d0a6f2..6a077ee54 100644
--- a/app/controllers/users/sessions_controller.rb
+++ b/app/controllers/users/sessions_controller.rb
@@ -15,7 +15,7 @@ class Users::SessionsController < Devise::SessionsController
     end
 
     def verifying_via_email?
-      return false unless resource.present?
+      return false if resource.blank?
       stored_path = session[stored_location_key_for(resource)] || ""
       stored_path[0..5] == "/email"
     end
diff --git a/app/controllers/valuation/budget_investments_controller.rb b/app/controllers/valuation/budget_investments_controller.rb
index ae747464e..c01f87c38 100644
--- a/app/controllers/valuation/budget_investments_controller.rb
+++ b/app/controllers/valuation/budget_investments_controller.rb
@@ -59,7 +59,7 @@ class Valuation::BudgetInvestmentsController < Valuation::BaseController
     end
 
     def params_for_current_valuator
-        Budget::Investment.filter_params(params).merge({valuator_id: current_user.valuator.id, budget_id: @budget.id})
+      Budget::Investment.filter_params(params).merge(valuator_id: current_user.valuator.id, budget_id: @budget.id)
     end
 
     def valuation_params
diff --git a/app/helpers/budgets_helper.rb b/app/helpers/budgets_helper.rb
index 3a07f0393..fefda85ab 100644
--- a/app/helpers/budgets_helper.rb
+++ b/app/helpers/budgets_helper.rb
@@ -8,7 +8,7 @@ module BudgetsHelper
     Budget::CURRENCY_SYMBOLS.map { |cs| [ cs, cs ] }
   end
 
-  def namespaced_budget_investment_path(investment, options={})
+  def namespaced_budget_investment_path(investment, options = {})
     case namespace
     when "management/budgets"
       management_budget_investment_path(investment.budget, investment, options)
@@ -17,7 +17,7 @@ module BudgetsHelper
     end
   end
 
-  def namespaced_budget_investment_vote_path(investment, options={})
+  def namespaced_budget_investment_vote_path(investment, options = {})
     case namespace
     when "management/budgets"
       vote_management_budget_investment_path(investment.budget, investment, options)
@@ -31,7 +31,7 @@ module BudgetsHelper
   end
 
   def css_for_ballot_heading(heading)
-    return '' unless current_ballot.present?
+    return '' if current_ballot.blank?
     current_ballot.has_lines_in_heading?(heading) ? 'active' : ''
   end
 
diff --git a/app/helpers/layouts_helper.rb b/app/helpers/layouts_helper.rb
index c92f57898..40c8b0b98 100644
--- a/app/helpers/layouts_helper.rb
+++ b/app/helpers/layouts_helper.rb
@@ -3,7 +3,7 @@ module LayoutsHelper
   def layout_menu_link_to(text, path, is_active, options)
     if is_active
       content_tag(:span, t('shared.you_are_in'), class: 'sr-only') + ' ' +
-      link_to(text, path, options.merge(class: "active"))
+        link_to(text, path, options.merge(class: "active"))
     else
       link_to(text, path, options)
     end
diff --git a/app/helpers/officing_helper.rb b/app/helpers/officing_helper.rb
index 2cfebf832..f5bdb26ea 100644
--- a/app/helpers/officing_helper.rb
+++ b/app/helpers/officing_helper.rb
@@ -11,9 +11,9 @@ module OfficingHelper
   def booths_for_officer_select_options(officer_assignments)
     options = []
     officer_assignments.each do |oa|
-      options << ["#{oa.booth_assignment.booth.name}", oa.id]
+      options << [oa.booth_assignment.booth.name.to_s, oa.id]
     end
-    options.sort! {|x,y| x[0]<=>y[0]}
+    options.sort! {|x, y| x[0]<=>y[0]}
     options_for_select(options, params[:oa])
   end
 
diff --git a/app/helpers/polls_helper.rb b/app/helpers/polls_helper.rb
index 5425a6b52..169599a7c 100644
--- a/app/helpers/polls_helper.rb
+++ b/app/helpers/polls_helper.rb
@@ -1,9 +1,9 @@
 module PollsHelper
 
-  def poll_select_options(include_all=nil)
-    options = @polls.collect {|poll|
+  def poll_select_options(include_all = nil)
+    options = @polls.collect do |poll|
       [poll.name, current_path_with_query_params(poll_id: poll.id)]
-    }
+    end
     options << all_polls if include_all
     options_for_select(options, request.fullpath)
   end
diff --git a/app/models/budget/ballot/line.rb b/app/models/budget/ballot/line.rb
index 175e9886d..e4e1d598b 100644
--- a/app/models/budget/ballot/line.rb
+++ b/app/models/budget/ballot/line.rb
@@ -13,7 +13,7 @@ class Budget
       validate :check_sufficient_funds
       validate :check_valid_heading
 
-      scope :by_investment, -> (investment_id) { where(investment_id: investment_id) }
+      scope :by_investment, ->(investment_id) { where(investment_id: investment_id) }
 
       before_validation :set_denormalized_ids
 
diff --git a/app/models/budget/investment.rb b/app/models/budget/investment.rb
index 7aabf7093..01ab15de3 100644
--- a/app/models/budget/investment.rb
+++ b/app/models/budget/investment.rb
@@ -52,11 +52,11 @@ class Budget
     scope :unselected,                  -> { not_unfeasible.where(selected: false) }
     scope :last_week,                   -> { where("created_at >= ?", 7.days.ago)}
 
-    scope :by_group,    -> (group_id)    { where(group_id: group_id) }
-    scope :by_heading,  -> (heading_id)  { where(heading_id: heading_id) }
-    scope :by_admin,    -> (admin_id)    { where(administrator_id: admin_id) }
-    scope :by_tag,      -> (tag_name)    { tagged_with(tag_name) }
-    scope :by_valuator, -> (valuator_id) { where("budget_valuator_assignments.valuator_id = ?", valuator_id).joins(:valuator_assignments) }
+    scope :by_group,    ->(group_id)    { where(group_id: group_id) }
+    scope :by_heading,  ->(heading_id)  { where(heading_id: heading_id) }
+    scope :by_admin,    ->(admin_id)    { where(administrator_id: admin_id) }
+    scope :by_tag,      ->(tag_name)    { tagged_with(tag_name) }
+    scope :by_valuator, ->(valuator_id) { where("budget_valuator_assignments.valuator_id = ?", valuator_id).joins(:valuator_assignments) }
 
     scope :for_render,             -> { includes(:heading) }
 
@@ -65,7 +65,7 @@ class Budget
     before_validation :set_denormalized_ids
 
     def self.filter_params(params)
-      params.select{|x,_| %w{heading_id group_id administrator_id tag_name valuator_id}.include? x.to_s }
+      params.select{|x, _| %w{heading_id group_id administrator_id tag_name valuator_id}.include? x.to_s }
     end
 
     def self.scoped_filter(params, current_filter)
@@ -152,7 +152,7 @@ class Budget
       return :not_logged_in unless user
       return :organization  if user.organization?
       return :not_verified  unless user.can?(:vote, Budget::Investment)
-      return nil
+      nil
     end
 
     def permission_problem?(user)
@@ -177,8 +177,8 @@ class Budget
     end
 
     def heading_voted_by_user?(user)
-      user.votes.for_budget_investments(budget.investments.where(group: group)).
-      votables.map(&:heading_id).first
+      user.votes.for_budget_investments(budget.investments.where(group: group))
+          .votables.map(&:heading_id).first
     end
 
     def ballotable_by?(user)
@@ -204,8 +204,8 @@ class Budget
 
     def should_show_aside?
       (budget.selecting?  && !unfeasible?) ||
-      (budget.balloting?  && feasible?)    ||
-      (budget.valuating? && !unfeasible?)
+        (budget.balloting?  && feasible?)    ||
+        (budget.valuating? && !unfeasible?)
     end
 
     def should_show_votes?
@@ -222,21 +222,21 @@ class Budget
 
     def should_show_price?
       feasible? &&
-      selected? &&
-      (budget.reviewing_ballots? || budget.finished?)
+        selected? &&
+        (budget.reviewing_ballots? || budget.finished?)
     end
 
     def should_show_price_info?
       feasible? &&
-      price_explanation.present? &&
-      (budget.balloting? || budget.reviewing_ballots? || budget.finished?)
+        price_explanation.present? &&
+        (budget.balloting? || budget.reviewing_ballots? || budget.finished?)
     end
 
     def formatted_price
       budget.formatted_amount(price)
     end
 
-    def self.apply_filters_and_search(budget, params, current_filter=nil)
+    def self.apply_filters_and_search(_budget, params, current_filter = nil)
       investments = all
       investments = investments.send(current_filter)            if current_filter.present?
       investments = investments.by_heading(params[:heading_id]) if params[:heading_id].present?
diff --git a/app/models/budget/reclassification.rb b/app/models/budget/reclassification.rb
index f8d1db7fd..3ce3ab146 100644
--- a/app/models/budget/reclassification.rb
+++ b/app/models/budget/reclassification.rb
@@ -7,14 +7,14 @@ class Budget
     end
 
     def check_for_reclassification
-     if heading_changed?
-       log_heading_change
-       store_reclassified_votes("heading_changed")
-       remove_reclassified_votes
-     elsif marked_as_unfeasible?
-       store_reclassified_votes("unfeasible")
-       remove_reclassified_votes
-     end
+      if heading_changed?
+        log_heading_change
+        store_reclassified_votes("heading_changed")
+        remove_reclassified_votes
+      elsif marked_as_unfeasible?
+        store_reclassified_votes("unfeasible")
+        remove_reclassified_votes
+      end
     end
 
     def heading_changed?
diff --git a/app/models/officing/residence.rb b/app/models/officing/residence.rb
index 6343fc5f7..539b557a5 100644
--- a/app/models/officing/residence.rb
+++ b/app/models/officing/residence.rb
@@ -108,7 +108,7 @@ class Officing::Residence
 
     def residency_valid?
       @census_api_response.valid? &&
-      @census_api_response.date_of_birth.year.to_s == year_of_birth.to_s
+        @census_api_response.date_of_birth.year.to_s == year_of_birth.to_s
     end
 
     def census_year_of_birth
@@ -116,7 +116,7 @@ class Officing::Residence
     end
 
     def clean_document_number
-      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase unless self.document_number.blank?
+      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase if self.document_number.present?
     end
 
     def random_password
diff --git a/app/models/poll/answer.rb b/app/models/poll/answer.rb
index 52fb11469..a1ff30f0a 100644
--- a/app/models/poll/answer.rb
+++ b/app/models/poll/answer.rb
@@ -10,8 +10,8 @@ class Poll::Answer < ActiveRecord::Base
   validates :answer, presence: true
   validates :answer, inclusion: {in: ->(a) { a.question.valid_answers }}
 
-  scope :by_author, -> (author_id) { where(author_id: author_id) }
-  scope :by_question, -> (question_id) { where(question_id: question_id) }
+  scope :by_author, ->(author_id) { where(author_id: author_id) }
+  scope :by_question, ->(question_id) { where(question_id: question_id) }
 
   def record_voter_participation
     Poll::Voter.create!(user: author, poll: poll)
diff --git a/app/models/poll/null_result.rb b/app/models/poll/null_result.rb
index 222432c7f..d1724037b 100644
--- a/app/models/poll/null_result.rb
+++ b/app/models/poll/null_result.rb
@@ -1,6 +1,6 @@
 class Poll::NullResult < ActiveRecord::Base
 
-  VALID_ORIGINS = %w{ web booth }
+  VALID_ORIGINS = %w{web booth}
 
   belongs_to :author, ->   { with_hidden }, class_name: 'User', foreign_key: 'author_id'
   belongs_to :booth_assignment
@@ -9,7 +9,7 @@ class Poll::NullResult < ActiveRecord::Base
   validates :author, presence: true
   validates :origin, inclusion: {in: VALID_ORIGINS}
 
-  scope :by_author, -> (author_id) { where(author_id: author_id) }
+  scope :by_author, ->(author_id) { where(author_id: author_id) }
 
   before_save :update_logs
 
@@ -20,4 +20,4 @@ class Poll::NullResult < ActiveRecord::Base
       self.author_id_log += ":#{self.author_id_was.to_s}"
     end
   end
-end
\ No newline at end of file
+end
diff --git a/app/models/poll/partial_result.rb b/app/models/poll/partial_result.rb
index e42589a03..dbc0d6bae 100644
--- a/app/models/poll/partial_result.rb
+++ b/app/models/poll/partial_result.rb
@@ -1,6 +1,6 @@
 class Poll::PartialResult < ActiveRecord::Base
 
-  VALID_ORIGINS = %w{ web booth }
+  VALID_ORIGINS = %w{web booth}
 
   belongs_to :question, -> { with_hidden }
   belongs_to :author, ->   { with_hidden }, class_name: 'User', foreign_key: 'author_id'
@@ -13,8 +13,8 @@ class Poll::PartialResult < ActiveRecord::Base
   validates :answer, inclusion: {in: ->(a) { a.question.valid_answers }}
   validates :origin, inclusion: {in: VALID_ORIGINS}
 
-  scope :by_author, -> (author_id) { where(author_id: author_id) }
-  scope :by_question, -> (question_id) { where(question_id: question_id) }
+  scope :by_author, ->(author_id) { where(author_id: author_id) }
+  scope :by_question, ->(question_id) { where(question_id: question_id) }
 
   before_save :update_logs
 
@@ -25,4 +25,4 @@ class Poll::PartialResult < ActiveRecord::Base
       self.author_id_log += ":#{self.author_id_was.to_s}"
     end
   end
-end
\ No newline at end of file
+end
diff --git a/app/models/poll/voter.rb b/app/models/poll/voter.rb
index b05839501..6da6b98b2 100644
--- a/app/models/poll/voter.rb
+++ b/app/models/poll/voter.rb
@@ -14,7 +14,7 @@ class Poll
     before_validation :set_demographic_info, :set_document_info
 
     def set_demographic_info
-      return unless user.present?
+      return if user.blank?
 
       self.gender  = user.gender
       self.age     = user.age
@@ -22,7 +22,7 @@ class Poll
     end
 
     def set_document_info
-      return unless user.present?
+      return if user.blank?
 
       self.document_type   = user.document_type
       self.document_number = user.document_number
@@ -51,7 +51,7 @@ class Poll
           nil
         else
           now = Time.current.to_date
-          now.year - dob.year - ((now.month > dob.month || (now.month == dob.month && now.day >= dob.day)) ? 0 : 1)
+          now.year - dob.year - (now.month > dob.month || (now.month == dob.month && now.day >= dob.day) ? 0 : 1)
         end
       end
 
diff --git a/app/models/poll/white_result.rb b/app/models/poll/white_result.rb
index 5b0aa4966..6ca613d05 100644
--- a/app/models/poll/white_result.rb
+++ b/app/models/poll/white_result.rb
@@ -1,6 +1,6 @@
 class Poll::WhiteResult < ActiveRecord::Base
 
-  VALID_ORIGINS = %w{ web booth }
+  VALID_ORIGINS = %w{web booth}
 
   belongs_to :author, ->   { with_hidden }, class_name: 'User', foreign_key: 'author_id'
   belongs_to :booth_assignment
@@ -9,7 +9,7 @@ class Poll::WhiteResult < ActiveRecord::Base
   validates :author, presence: true
   validates :origin, inclusion: {in: VALID_ORIGINS}
 
-  scope :by_author, -> (author_id) { where(author_id: author_id) }
+  scope :by_author, ->(author_id) { where(author_id: author_id) }
 
   before_save :update_logs
 
@@ -20,4 +20,4 @@ class Poll::WhiteResult < ActiveRecord::Base
       self.author_id_log += ":#{self.author_id_was.to_s}"
     end
   end
-end
\ No newline at end of file
+end
diff --git a/app/models/signature_sheet.rb b/app/models/signature_sheet.rb
index 1434143ac..3b2f8333d 100644
--- a/app/models/signature_sheet.rb
+++ b/app/models/signature_sheet.rb
@@ -2,7 +2,7 @@ class SignatureSheet < ActiveRecord::Base
   belongs_to :signable, polymorphic: true
   belongs_to :author, class_name: 'User', foreign_key: 'author_id'
 
-  VALID_SIGNABLES = %w( Proposal Budget::Investment SpendingProposal )
+  VALID_SIGNABLES = %w(Proposal Budget::Investment SpendingProposal)
 
   has_many :signatures
 
@@ -35,4 +35,4 @@ class SignatureSheet < ActiveRecord::Base
   def signable_found
     errors.add(:signable_id, :not_found) if errors.messages[:signable].present?
   end
-end
\ No newline at end of file
+end
diff --git a/app/models/site_customization/image.rb b/app/models/site_customization/image.rb
index 2230a96ce..0886a3d03 100644
--- a/app/models/site_customization/image.rb
+++ b/app/models/site_customization/image.rb
@@ -9,7 +9,7 @@ class SiteCustomization::Image < ActiveRecord::Base
   has_attached_file :image
 
   validates :name, presence: true, uniqueness: true, inclusion: { in: VALID_IMAGES.keys }
-  validates_attachment_content_type :image, :content_type => ["image/png"]
+  validates_attachment_content_type :image, content_type: ["image/png"]
   validate :check_image
 
   def self.all_images
diff --git a/app/models/user.rb b/app/models/user.rb
index e55bd00e5..7d696297e 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -154,7 +154,7 @@ class User < ActiveRecord::Base
 
   def has_official_email?
     domain = Setting['email_domain_for_officials']
-    !email.blank? && ( (email.end_with? "@#{domain}") || (email.end_with? ".#{domain}") )
+    email.present? && ( (email.end_with? "@#{domain}") || (email.end_with? ".#{domain}") )
   end
 
   def display_official_position_badge?
@@ -289,7 +289,7 @@ class User < ActiveRecord::Base
   private
 
     def clean_document_number
-      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase unless self.document_number.blank?
+      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase if self.document_number.present?
     end
 
     def validate_username_length
diff --git a/app/models/verification/residence.rb b/app/models/verification/residence.rb
index ea000677f..bafff129b 100644
--- a/app/models/verification/residence.rb
+++ b/app/models/verification/residence.rb
@@ -81,7 +81,7 @@ class Verification::Residence
     end
 
     def clean_document_number
-      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase unless self.document_number.blank?
+      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase if self.document_number.present?
     end
 
 end
diff --git a/lib/age.rb b/lib/age.rb
index f0ca9abe0..cf619133d 100644
--- a/lib/age.rb
+++ b/lib/age.rb
@@ -1,7 +1,7 @@
 module Age
   def self.in_years(dob, now = Time.current.to_date)
-    return nil unless dob.present?
+    return nil if dob.blank?
     # reference: http://stackoverflow.com/questions/819263/get-persons-age-in-ruby#comment21200772_819263
-    now.year - dob.year - ((now.month > dob.month || (now.month == dob.month && now.day >= dob.day)) ? 0 : 1)
+    now.year - dob.year - (now.month > dob.month || (now.month == dob.month && now.day >= dob.day) ? 0 : 1)
   end
 end
diff --git a/lib/document_parser.rb b/lib/document_parser.rb
index c6cd53c92..c60b180dc 100644
--- a/lib/document_parser.rb
+++ b/lib/document_parser.rb
@@ -26,18 +26,18 @@ module DocumentParser
     else
       letter = nil
     end
-    return document_number, letter
+    [document_number, letter]
   end
 
   # if the number has less digits than it should, pad with zeros to the left and add each variant to the list
   # For example, if the initial document_number is 1234, and digits=8, the result is
   # ['1234', '01234', '001234', '0001234']
-  def get_number_variants_with_leading_zeroes_from(document_number, digits=8)
+  def get_number_variants_with_leading_zeroes_from(document_number, digits = 8)
     document_number = document_number.to_s.last(digits) # Keep only the last x digits
     document_number = document_number.gsub(/^0+/, '')   # Removes leading zeros
 
     variants = []
-    variants << document_number unless document_number.blank?
+    variants << document_number if document_number.present?
     while document_number.size < digits
       document_number = "0#{document_number}"
       variants << document_number
@@ -50,7 +50,7 @@ module DocumentParser
   # ['1234a', '1234A', '01234a', '01234A']
   def get_letter_variants(number_variants, letter)
     variants = []
-    if letter.present? then
+    if letter.present?
       number_variants.each do |number|
         variants << number + letter.downcase << number + letter.upcase
       end