diff --git a/app/models/activity.rb b/app/models/activity.rb
index 3accc495b..2d969e924 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -4,7 +4,7 @@ class Activity < ApplicationRecord
 
   VALID_ACTIONS = %w[hide block restore valuate email].freeze
 
-  validates :action, inclusion: { in: VALID_ACTIONS }
+  validates :action, inclusion: { in: ->(*) { VALID_ACTIONS }}
 
   scope :on_proposals, -> { where(actionable_type: "Proposal") }
   scope :on_debates, -> { where(actionable_type: "Debate") }
diff --git a/app/models/budget.rb b/app/models/budget.rb
index 1f7c7dc2b..cec58efe6 100644
--- a/app/models/budget.rb
+++ b/app/models/budget.rb
@@ -25,10 +25,10 @@ class Budget < ApplicationRecord
 
   validates_translation :name, presence: true
   validates_translation :main_link_url, presence: true, unless: -> { main_link_text.blank? }
-  validates :phase, inclusion: { in: Budget::Phase::PHASE_KINDS }
+  validates :phase, inclusion: { in: ->(*) { Budget::Phase::PHASE_KINDS }}
   validates :currency_symbol, presence: true
   validates :slug, presence: true, format: /\A[a-z0-9\-_]+\z/
-  validates :voting_style, inclusion: { in: VOTING_STYLES }
+  validates :voting_style, inclusion: { in: ->(*) { VOTING_STYLES }}
 
   has_many :investments, dependent: :destroy
   has_many :ballots, dependent: :destroy
diff --git a/app/models/budget/phase.rb b/app/models/budget/phase.rb
index ae0c37634..28ae761d1 100644
--- a/app/models/budget/phase.rb
+++ b/app/models/budget/phase.rb
@@ -19,7 +19,7 @@ class Budget
     has_one :prev_phase, class_name: name, foreign_key: :next_phase_id, inverse_of: :next_phase
 
     validates_translation :name, presence: true
-    validates_translation :description, length: { maximum: DESCRIPTION_MAX_LENGTH }
+    validates_translation :description, length: { maximum: ->(*) { DESCRIPTION_MAX_LENGTH }}
     validates_translation :main_link_url, presence: true, unless: -> { main_link_text.blank? }
     validates :budget, presence: true
     validates :kind, presence: true, uniqueness: { scope: :budget }, inclusion: { in: ->(*) { PHASE_KINDS }}
diff --git a/app/models/budget/reclassified_vote.rb b/app/models/budget/reclassified_vote.rb
index ea73d27c1..958f6479a 100644
--- a/app/models/budget/reclassified_vote.rb
+++ b/app/models/budget/reclassified_vote.rb
@@ -7,6 +7,6 @@ class Budget
 
     validates :user, presence: true
     validates :investment, presence: true
-    validates :reason, inclusion: { in: REASONS, allow_nil: false }
+    validates :reason, inclusion: { in: ->(*) { REASONS }, allow_nil: false }
   end
 end
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 443d2322d..e6f9a0af3 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -21,7 +21,7 @@ class Comment < ApplicationRecord
   validates_translation :body, presence: true
   validates :user, presence: true
 
-  validates :commentable_type, inclusion: { in: COMMENTABLE_TYPES }
+  validates :commentable_type, inclusion: { in: ->(*) { COMMENTABLE_TYPES }}
 
   validate :validate_body_length
   validate :comment_valuation, if: -> { valuation }
diff --git a/app/models/legislation/draft_version.rb b/app/models/legislation/draft_version.rb
index 9019d6cb8..c7576c421 100644
--- a/app/models/legislation/draft_version.rb
+++ b/app/models/legislation/draft_version.rb
@@ -17,7 +17,7 @@ class Legislation::DraftVersion < ApplicationRecord
 
   validates_translation :title, presence: true
   validates_translation :body, presence: true
-  validates :status, presence: true, inclusion: { in: VALID_STATUSES }
+  validates :status, presence: true, inclusion: { in: ->(*) { VALID_STATUSES }}
 
   scope :published, -> { where(status: "published").order("id DESC") }
 
diff --git a/app/models/legislation/process.rb b/app/models/legislation/process.rb
index 77240a13e..a0b28c3fd 100644
--- a/app/models/legislation/process.rb
+++ b/app/models/legislation/process.rb
@@ -55,8 +55,8 @@ class Legislation::Process < ApplicationRecord
   end
 
   validate :valid_date_ranges
-  validates :background_color, format: { allow_blank: true, with: CSS_HEX_COLOR }
-  validates :font_color, format: { allow_blank: true, with: CSS_HEX_COLOR }
+  validates :background_color, format: { allow_blank: true, with: ->(*) { CSS_HEX_COLOR }}
+  validates :font_color, format: { allow_blank: true, with: ->(*) { CSS_HEX_COLOR }}
 
   class << self; undef :open; end
   scope :open, -> { where("start_date <= ? and end_date >= ?", Date.current, Date.current) }
diff --git a/app/models/poll/partial_result.rb b/app/models/poll/partial_result.rb
index d8e9cc18b..eb11dd4e3 100644
--- a/app/models/poll/partial_result.rb
+++ b/app/models/poll/partial_result.rb
@@ -11,7 +11,7 @@ class Poll::PartialResult < ApplicationRecord
   validates :answer, presence: true
   validates :answer, inclusion: { in: ->(a) { a.question.possible_answers }},
                      unless: ->(a) { a.question.blank? }
-  validates :origin, inclusion: { in: VALID_ORIGINS }
+  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) }
diff --git a/app/models/poll/recount.rb b/app/models/poll/recount.rb
index b5fb52bbf..578956692 100644
--- a/app/models/poll/recount.rb
+++ b/app/models/poll/recount.rb
@@ -6,7 +6,7 @@ class Poll::Recount < ApplicationRecord
   belongs_to :officer_assignment
 
   validates :author, presence: true
-  validates :origin, inclusion: { in: VALID_ORIGINS }
+  validates :origin, inclusion: { in: ->(*) { VALID_ORIGINS }}
 
   scope :web,    -> { where(origin: "web") }
   scope :booth,  -> { where(origin: "booth") }
diff --git a/app/models/poll/voter.rb b/app/models/poll/voter.rb
index 2ea150718..ab6e3a0a6 100644
--- a/app/models/poll/voter.rb
+++ b/app/models/poll/voter.rb
@@ -16,7 +16,7 @@ class Poll
 
     validates :document_number, presence: true, unless: :skip_user_verification?
     validates :user_id, uniqueness: { scope: [:poll_id], message: :has_voted }
-    validates :origin, inclusion: { in: VALID_ORIGINS }
+    validates :origin, inclusion: { in: ->(*) { VALID_ORIGINS }}
 
     before_validation :set_demographic_info, :set_document_info, :set_denormalized_booth_assignment_id
 
diff --git a/app/models/progress_bar.rb b/app/models/progress_bar.rb
index 3da9c072b..cf20c0d2e 100644
--- a/app/models/progress_bar.rb
+++ b/app/models/progress_bar.rb
@@ -16,7 +16,7 @@ class ProgressBar < ApplicationRecord
               scope: [:progressable_type, :progressable_id],
               conditions: -> { primary }
             }
-  validates :percentage, presence: true, inclusion: RANGE, numericality: { only_integer: true }
+  validates :percentage, presence: true, inclusion: { in: ->(*) { RANGE }}, numericality: { only_integer: true }
 
   validates_translation :title, presence: true, unless: :primary?
 end
diff --git a/app/models/proposal.rb b/app/models/proposal.rb
index 3f1ff98e3..92bcc2aa1 100644
--- a/app/models/proposal.rb
+++ b/app/models/proposal.rb
@@ -51,7 +51,7 @@ class Proposal < ApplicationRecord
   validates :responsible_name, presence: true, unless: :skip_user_verification?
 
   validates :responsible_name, length: { in: 6..Proposal.responsible_name_max_length }, unless: :skip_user_verification?
-  validates :retired_reason, presence: true, inclusion: { in: RETIRE_OPTIONS }, unless: -> { retired_at.blank? }
+  validates :retired_reason, presence: true, inclusion: { in: ->(*) { RETIRE_OPTIONS }}, unless: -> { retired_at.blank? }
 
   validates :terms_of_service, acceptance: { allow_nil: false }, on: :create
 
diff --git a/app/models/signature_sheet.rb b/app/models/signature_sheet.rb
index c767c0bf1..713d6ef71 100644
--- a/app/models/signature_sheet.rb
+++ b/app/models/signature_sheet.rb
@@ -7,7 +7,7 @@ class SignatureSheet < ApplicationRecord
   has_many :signatures
 
   validates :author, presence: true
-  validates :signable_type, inclusion: { in: VALID_SIGNABLES }
+  validates :signable_type, inclusion: { in: ->(*) { VALID_SIGNABLES }}
   validates :required_fields_to_verify, presence: true
   validates :signable, presence: true
   validate  :signable_found
diff --git a/app/models/site_customization/content_block.rb b/app/models/site_customization/content_block.rb
index a41580e36..744819956 100644
--- a/app/models/site_customization/content_block.rb
+++ b/app/models/site_customization/content_block.rb
@@ -2,7 +2,7 @@ class SiteCustomization::ContentBlock < ApplicationRecord
   VALID_BLOCKS = %w[top_links footer subnavigation_left subnavigation_right].freeze
 
   validates :locale, presence: true, inclusion: { in: I18n.available_locales.map(&:to_s) }
-  validates :name, presence: true, uniqueness: { scope: :locale }, inclusion: { in: VALID_BLOCKS }
+  validates :name, presence: true, uniqueness: { scope: :locale }, inclusion: { in: ->(*) { VALID_BLOCKS }}
 
   def self.block_for(name, locale)
     locale ||= I18n.default_locale
diff --git a/app/models/site_customization/image.rb b/app/models/site_customization/image.rb
index c9c41ed6a..185da4a25 100644
--- a/app/models/site_customization/image.rb
+++ b/app/models/site_customization/image.rb
@@ -13,7 +13,7 @@ class SiteCustomization::Image < ApplicationRecord
 
   has_attachment :image
 
-  validates :name, presence: true, uniqueness: true, inclusion: { in: VALID_IMAGES.keys }
+  validates :name, presence: true, uniqueness: true, inclusion: { in: ->(*) { VALID_IMAGES.keys }}
   validates :image, file_content_type: { allow: ["image/png", "image/jpeg"], if: -> { image.attached? }}
   validate :check_image
 
diff --git a/app/models/site_customization/page.rb b/app/models/site_customization/page.rb
index 2c2c84fd5..a5a1105d1 100644
--- a/app/models/site_customization/page.rb
+++ b/app/models/site_customization/page.rb
@@ -10,7 +10,7 @@ class SiteCustomization::Page < ApplicationRecord
   validates :slug, presence: true,
                    uniqueness: { case_sensitive: false },
                    format: { with: /\A[0-9a-zA-Z\-_]*\Z/, message: :slug_format }
-  validates :status, presence: true, inclusion: { in: VALID_STATUSES }
+  validates :status, presence: true, inclusion: { in: ->(*) { VALID_STATUSES }}
 
   scope :published, -> { where(status: "published").sort_desc }
   scope :sort_asc, -> { order("id ASC") }
diff --git a/spec/models/activity_spec.rb b/spec/models/activity_spec.rb
index 16db70490..185d9ea84 100644
--- a/spec/models/activity_spec.rb
+++ b/spec/models/activity_spec.rb
@@ -17,6 +17,13 @@ describe Activity do
     expect(build(:activity, action: "dissapear")).not_to be_valid
   end
 
+  it "dynamically validates valid actions" do
+    stub_const("#{Activity}::VALID_ACTIONS", %w[custom])
+
+    expect(build(:activity, action: "custom")).to be_valid
+    expect(build(:activity, action: "hide")).not_to be_valid
+  end
+
   describe "log" do
     it "creates an activity entry" do
       user = create(:user)
diff --git a/spec/models/budget/phase_spec.rb b/spec/models/budget/phase_spec.rb
index 58d70ca44..0833a2a62 100644
--- a/spec/models/budget/phase_spec.rb
+++ b/spec/models/budget/phase_spec.rb
@@ -28,6 +28,16 @@ describe Budget::Phase do
       end
     end
 
+    describe "description validations" do
+      it "dynamically validates the maximum length" do
+        stub_const("#{Budget::Phase}::DESCRIPTION_MAX_LENGTH", 3)
+
+        informing_phase.description_en = "long"
+
+        expect(informing_phase).not_to be_valid
+      end
+    end
+
     describe "#dates_range_valid?" do
       it "is valid when start & end dates are different & consecutive" do
         informing_phase.assign_attributes(starts_at: Date.current, ends_at: Date.tomorrow)
diff --git a/spec/models/budget/reclassified_vote_spec.rb b/spec/models/budget/reclassified_vote_spec.rb
index 90f0e04f5..5b0b8d893 100644
--- a/spec/models/budget/reclassified_vote_spec.rb
+++ b/spec/models/budget/reclassified_vote_spec.rb
@@ -34,5 +34,15 @@ describe Budget::ReclassifiedVote do
       reclassified_vote.reason = "unfeasible"
       expect(reclassified_vote).to be_valid
     end
+
+    it "dynamically validates the reasons" do
+      stub_const("#{Budget::ReclassifiedVote}::REASONS", %w[custom])
+
+      reclassified_vote.reason = "custom"
+      expect(reclassified_vote).to be_valid
+
+      reclassified_vote.reason = "unfeasible"
+      expect(reclassified_vote).not_to be_valid
+    end
   end
 end
diff --git a/spec/models/budget_spec.rb b/spec/models/budget_spec.rb
index 41e827e31..f6d9818d5 100644
--- a/spec/models/budget_spec.rb
+++ b/spec/models/budget_spec.rb
@@ -148,6 +148,16 @@ describe Budget do
       expect(budget).not_to be_valid
     end
 
+    it "dynamically validates the phases" do
+      stub_const("#{Budget::Phase}::PHASE_KINDS", %w[accepting custom])
+
+      budget.phase = "custom"
+      expect(budget).to be_valid
+
+      budget.phase = "reviewing"
+      expect(budget).not_to be_valid
+    end
+
     it "produces auxiliary methods" do
       budget.phase = "accepting"
       expect(budget).to be_accepting
@@ -444,6 +454,13 @@ describe Budget do
       it { expect(build(:budget, :approval)).to be_valid }
       it { expect(build(:budget, :knapsack)).to be_valid }
       it { expect(build(:budget, voting_style: "Oups!")).not_to be_valid }
+
+      it "dynamically validates the voting styles" do
+        stub_const("#{Budget}::VOTING_STYLES", %w[custom])
+
+        expect(build(:budget, voting_style: "custom")).to be_valid
+        expect(build(:budget, voting_style: "knapsack")).not_to be_valid
+      end
     end
 
     context "Related supportive methods" do
diff --git a/spec/models/comment_spec.rb b/spec/models/comment_spec.rb
index f52b099d9..7123c9605 100644
--- a/spec/models/comment_spec.rb
+++ b/spec/models/comment_spec.rb
@@ -11,6 +11,13 @@ describe Comment do
     expect(comment).to be_valid
   end
 
+  it "dynamically validates the commentable types" do
+    stub_const("#{Comment}::COMMENTABLE_TYPES", %w[Debate])
+
+    expect(build(:comment, commentable: create(:debate))).to be_valid
+    expect(build(:comment, commentable: create(:proposal))).not_to be_valid
+  end
+
   it "updates cache_counter in debate after hide and restore" do
     debate  = create(:debate)
     comment = create(:comment, commentable: debate)
diff --git a/spec/models/legislation/draft_version_spec.rb b/spec/models/legislation/draft_version_spec.rb
index b0416d590..910a15f65 100644
--- a/spec/models/legislation/draft_version_spec.rb
+++ b/spec/models/legislation/draft_version_spec.rb
@@ -10,6 +10,16 @@ describe Legislation::DraftVersion do
     expect(legislation_draft_version).to be_valid
   end
 
+  it "dynamically validates the valid statuses" do
+    stub_const("#{Legislation::DraftVersion}::VALID_STATUSES", %w[custom])
+
+    legislation_draft_version.status = "custom"
+    expect(legislation_draft_version).to be_valid
+
+    legislation_draft_version.status = "published"
+    expect(legislation_draft_version).not_to be_valid
+  end
+
   it "renders the html from the markdown body field" do
     legislation_draft_version.body = body_markdown
 
diff --git a/spec/models/legislation/process_spec.rb b/spec/models/legislation/process_spec.rb
index 0d0519407..5f0e2999c 100644
--- a/spec/models/legislation/process_spec.rb
+++ b/spec/models/legislation/process_spec.rb
@@ -10,6 +10,13 @@ describe Legislation::Process do
     expect(process).to be_valid
   end
 
+  it "dynamically validates the color format" do
+    stub_const("#{Legislation::Process}::CSS_HEX_COLOR", /[G-H]{2}/)
+
+    expect(build(:legislation_process, font_color: "GG", background_color: "GH")).to be_valid
+    expect(build(:legislation_process, font_color: "#ff0", background_color: "#00f")).not_to be_valid
+  end
+
   it "assigns default values to new processes" do
     process = Legislation::Process.new
 
diff --git a/spec/models/poll/partial_result_spec.rb b/spec/models/poll/partial_result_spec.rb
index b5a045329..3e92379a2 100644
--- a/spec/models/poll/partial_result_spec.rb
+++ b/spec/models/poll/partial_result_spec.rb
@@ -14,6 +14,13 @@ describe Poll::PartialResult do
 
       expect(build(:poll_partial_result, question: question, answer: "Four")).not_to be_valid
     end
+
+    it "dynamically validates the valid origins" do
+      stub_const("#{Poll::PartialResult}::VALID_ORIGINS", %w[custom])
+
+      expect(build(:poll_partial_result, origin: "custom")).to be_valid
+      expect(build(:poll_partial_result, origin: "web")).not_to be_valid
+    end
   end
 
   describe "logging changes" do
diff --git a/spec/models/poll/recount_spec.rb b/spec/models/poll/recount_spec.rb
index 11646edd8..4a8e741a4 100644
--- a/spec/models/poll/recount_spec.rb
+++ b/spec/models/poll/recount_spec.rb
@@ -1,6 +1,15 @@
 require "rails_helper"
 
 describe Poll::Recount do
+  describe "validations" do
+    it "dynamically validates the valid origins" do
+      stub_const("#{Poll::Recount}::VALID_ORIGINS", %w[custom])
+
+      expect(build(:poll_recount, origin: "custom")).to be_valid
+      expect(build(:poll_recount, origin: "web")).not_to be_valid
+    end
+  end
+
   describe "logging changes" do
     let(:author) { create(:user) }
     let(:officer_assignment) { create(:poll_officer_assignment) }
diff --git a/spec/models/poll/voter_spec.rb b/spec/models/poll/voter_spec.rb
index 9ed82be67..b30c7428e 100644
--- a/spec/models/poll/voter_spec.rb
+++ b/spec/models/poll/voter_spec.rb
@@ -117,6 +117,13 @@ describe Poll::Voter do
         voter.origin = "web"
         expect(voter).to be_valid
       end
+
+      it "dynamically validates the valid origins" do
+        stub_const("#{Poll::Voter}::VALID_ORIGINS", %w[custom])
+
+        expect(build(:poll_voter, origin: "custom")).to be_valid
+        expect(build(:poll_voter, origin: "web")).not_to be_valid
+      end
     end
 
     context "assignments" do
diff --git a/spec/models/progress_bar_spec.rb b/spec/models/progress_bar_spec.rb
index f5ea05c8f..f0efbbcbd 100644
--- a/spec/models/progress_bar_spec.rb
+++ b/spec/models/progress_bar_spec.rb
@@ -64,6 +64,18 @@ describe ProgressBar do
     expect(progress_bar).to be_valid
   end
 
+  it "dynamically validates the percentage range" do
+    stub_const("#{ProgressBar}::RANGE", (-99..99))
+
+    progress_bar.percentage = -99
+
+    expect(progress_bar).to be_valid
+
+    progress_bar.percentage = 100
+
+    expect(progress_bar).not_to be_valid
+  end
+
   it "is not valid without a progressable" do
     progress_bar.progressable = nil
 
diff --git a/spec/models/proposal_spec.rb b/spec/models/proposal_spec.rb
index 5e14c7688..469e986b2 100644
--- a/spec/models/proposal_spec.rb
+++ b/spec/models/proposal_spec.rb
@@ -171,6 +171,19 @@ describe Proposal do
       proposal.retired_reason = nil
       expect(proposal).not_to be_valid
     end
+
+    it "dynamically validates the retired reason" do
+      stub_const("#{Proposal}::RETIRE_OPTIONS", %w[custom])
+
+      proposal.retired_at = Time.current
+      proposal.retired_explanation = "My custom reason"
+
+      proposal.retired_reason = "custom"
+      expect(proposal).to be_valid
+
+      proposal.retired_reason = "duplicated"
+      expect(proposal).not_to be_valid
+    end
   end
 
   describe "#editable?" do
diff --git a/spec/models/signature_sheet_spec.rb b/spec/models/signature_sheet_spec.rb
index c32e94b5c..9224b61a9 100644
--- a/spec/models/signature_sheet_spec.rb
+++ b/spec/models/signature_sheet_spec.rb
@@ -26,6 +26,16 @@ describe SignatureSheet do
       expect(signature_sheet).not_to be_valid
     end
 
+    it "dynamically validates the valid signables" do
+      stub_const("#{SignatureSheet}::VALID_SIGNABLES", %w[Comment])
+
+      signature_sheet.signable = create(:comment)
+      expect(signature_sheet).to be_valid
+
+      signature_sheet.signable = create(:proposal)
+      expect(signature_sheet).not_to be_valid
+    end
+
     it "is not valid without document numbers" do
       signature_sheet.required_fields_to_verify = nil
       expect(signature_sheet).not_to be_valid
diff --git a/spec/models/site_customization/content_block_spec.rb b/spec/models/site_customization/content_block_spec.rb
index 7cdc5b1b8..e5f1e1ec5 100644
--- a/spec/models/site_customization/content_block_spec.rb
+++ b/spec/models/site_customization/content_block_spec.rb
@@ -17,4 +17,14 @@ RSpec.describe SiteCustomization::ContentBlock, type: :model do
     valid_block = build(:site_customization_content_block, name: "top_links", locale: "es")
     expect(valid_block).to be_valid
   end
+
+  it "dynamically validates the valid blocks" do
+    stub_const("#{SiteCustomization::ContentBlock}::VALID_BLOCKS", %w[custom])
+
+    block.name = "custom"
+    expect(block).to be_valid
+
+    block.name = "top_links"
+    expect(block).not_to be_valid
+  end
 end
diff --git a/spec/models/site_customization/image_spec.rb b/spec/models/site_customization/image_spec.rb
index 076fc01d5..945046144 100644
--- a/spec/models/site_customization/image_spec.rb
+++ b/spec/models/site_customization/image_spec.rb
@@ -33,5 +33,15 @@ describe SiteCustomization::Image do
 
       expect(image).not_to be_valid
     end
+
+    it "dynamically validates the valid images" do
+      stub_const("#{SiteCustomization::Image}::VALID_IMAGES", { "custom" => [223, 80] })
+
+      custom = build(:site_customization_image, name: "custom", image: fixture_file_upload("logo_header.png"))
+      expect(custom).to be_valid
+
+      map = build(:site_customization_image, name: "map", image: fixture_file_upload("custom_map.jpg"))
+      expect(map).not_to be_valid
+    end
   end
 end
diff --git a/spec/models/site_customization/page_spec.rb b/spec/models/site_customization/page_spec.rb
index e2c4f4250..cc700a59f 100644
--- a/spec/models/site_customization/page_spec.rb
+++ b/spec/models/site_customization/page_spec.rb
@@ -13,4 +13,14 @@ RSpec.describe SiteCustomization::Page, type: :model do
     custom_page = build(:site_customization_page, slug: "as/as*la")
     expect(custom_page).to be_invalid
   end
+
+  it "dynamically validates the valid statuses" do
+    stub_const("#{SiteCustomization::Page}::VALID_STATUSES", %w[custom])
+
+    custom_page.status = "custom"
+    expect(custom_page).to be_valid
+
+    custom_page.status = "published"
+    expect(custom_page).not_to be_valid
+  end
 end