adds scopes for every actionable class to activity

app/models/activity.rb

@@ -7,6 +7,12 @@ class Activity < ActiveRecord::Base
 
   validates :action, inclusion: {in: VALID_ACTIONS}
 
+  scope :on_proposals, -> { where(actionable_type: 'Proposal') }
+  scope :on_debates, -> { where(actionable_type: 'Debate') }
+  scope :on_users, -> { where(actionable_type: 'User') }
+  scope :on_comments, -> { where(actionable_type: 'Comment') }
+  scope :for_render, -> { includes(user: [:moderator, :administrator]).includes(:actionable) }
+
   def self.log(user, action, actionable)
     create(user: user, action: action.to_s, actionable: actionable)
   end

spec/models/activity_spec.rb

@@ -66,4 +66,23 @@ describe Activity do
     end
   end
 
+  describe "scopes by actionable" do
+    it "should filter by actionable type" do
+      on_proposal = create(:activity, actionable: create(:proposal))
+      on_debate   = create(:activity, actionable: create(:debate))
+      on_comment  = create(:activity, actionable: create(:comment))
+      on_user     = create(:activity, actionable: create(:user))
+
+      expect(Activity.on_proposals.size).to eq 1
+      expect(Activity.on_debates.size).to eq 1
+      expect(Activity.on_comments.size).to eq 1
+      expect(Activity.on_users.size).to eq 1
+
+      expect(Activity.on_proposals.first).to eq on_proposal
+      expect(Activity.on_debates.first).to eq on_debate
+      expect(Activity.on_comments.first).to eq on_comment
+      expect(Activity.on_users.first).to eq on_user
+    end
+  end
+
 end