Add Amendment Count column in Proposal admin panel

.github/workflows/test.yml

@@ -44,6 +44,7 @@ jobs:
           DATABASE_PASSWORD: postgres
       - name: Precompile assets
         run: |
+          sudo apt install imagemagick
           npm install
           bundle exec rake assets:precompile
         env:

app/models/decidim/amendment.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+module Decidim
+  class Amendment < ApplicationRecord
+    STATES = { draft: 0, evaluating: 10, accepted: 20, rejected: 30, withdrawn: -1 }.freeze
+
+    belongs_to :amendable, foreign_key: "decidim_amendable_id", foreign_type: "decidim_amendable_type", polymorphic: true
+    belongs_to :amender, foreign_key: "decidim_user_id", class_name: "Decidim::User"
+    belongs_to :emendation, foreign_key: "decidim_emendation_id", foreign_type: "decidim_emendation_type", polymorphic: true
+
+    validates :state, presence: true, inclusion: { in: STATES.keys.map(&:to_s) }
+
+    enum state: STATES, _default: "draft"
+
+    after_destroy :update_proposal_amendments_count
+    after_save :update_proposal_amendments_count
+
+    # Reports the mapped resource type for authorization transfers.
+    #
+    # @return [String] The resource type as string (i.e. its class name).
+    def mapped_resource_type
+      decidim_amendable_type
+    end
+
+    def promoted?
+      return false unless rejected?
+
+      emendation.linked_promoted_resource.present?
+    end
+
+    private
+
+    def update_proposal_amendments_count
+      Decidim::Proposals::Proposal.find(decidim_amendable_id).update_amendments_count
+    end
+  end
+end