adds activity model

app/models/activity.rb

@@ -0,0 +1,22 @@
+class Activity < ActiveRecord::Base
+
+  belongs_to :actionable, polymorphic: true
+  belongs_to :user
+
+  VALID_ACTIONS = %w( hide block restore )
+
+  validates :action, inclusion: {in: VALID_ACTIONS}
+
+  def self.log(user, action, actionable)
+    create(user: user, action: action.to_s, actionable: actionable)
+  end
+
+  def self.on(actionable)
+    where(actionable_type: actionable.class.name, actionable_id: actionable.id)
+  end
+
+  def self.by(user)
+    where(user: user)
+  end
+
+end

spec/factories.rb

@@ -33,6 +33,12 @@ FactoryGirl.define do
     uid "MyString"
   end
 
+  factory :activity do
+    user
+    action "hide"
+    association :actionable, factory: :proposal
+  end
+
   factory :verification_residence, class: Verification::Residence do
     user
     document_number  '12345678Z'

spec/models/activity_spec.rb

@@ -0,0 +1,69 @@
+require 'rails_helper'
+
+describe Activity do
+
+  it "should be valid for different actionables" do
+    expect(build(:activity, actionable: create(:proposal))).to be_valid
+    expect(build(:activity, actionable: create(:debate))).to be_valid
+    expect(build(:activity, actionable: create(:comment))).to be_valid
+    expect(build(:activity, actionable: create(:user))).to be_valid
+  end
+
+  it "should be a valid only with allowed actions" do
+    expect(build(:activity, action: "hide")).to be_valid
+    expect(build(:activity, action: "block")).to be_valid
+    expect(build(:activity, action: "restore")).to be_valid
+    expect(build(:activity, action: "dissapear")).to_not be_valid
+  end
+
+  describe "log" do
+    it "should create an activity entry" do
+      user = create(:user)
+      proposal = create(:proposal)
+
+      expect{ Activity.log(user, :hide, proposal) }.to change { Activity.count }.by(1)
+
+      activity = Activity.last
+      expect(activity.user_id).to eq(user.id)
+      expect(activity.action).to eq("hide")
+      expect(activity.actionable).to eq(proposal)
+    end
+  end
+
+  describe "on" do
+    it "should list all activity on an actionable object" do
+      proposal  = create(:proposal)
+      activity1 = create(:activity, action: "hide", actionable: proposal)
+      activity2 = create(:activity, action: "restore", actionable: proposal)
+      activity3 = create(:activity, action: "hide", actionable: proposal)
+      create(:activity, action: "restore", actionable: create(:debate))
+      create(:activity, action: "hide", actionable: create(:proposal))
+      create(:activity, action: "hide", actionable: create(:comment))
+      create(:activity, action: "block", actionable: create(:user))
+
+      expect(Activity.on(proposal).size).to eq 3
+      [activity1, activity2, activity3].each do |a|
+        expect(Activity.on(proposal)).to include(a)
+      end
+    end
+  end
+
+  describe "by" do
+    it "should list all activity of a user" do
+      user1 = create(:user)
+      activity1 = create(:activity, user: user1)
+      activity2 = create(:activity, user: user1, action: "restore", actionable: create(:debate))
+      activity3 = create(:activity, user: user1, action: "hide", actionable: create(:proposal))
+      activity4 = create(:activity, user: user1, action: "hide", actionable: create(:comment))
+      activity5 = create(:activity, user: user1, action: "block", actionable: create(:user))
+      create_list(:activity, 3)
+
+      expect(Activity.by(user1).size).to eq 5
+
+      [activity1, activity2, activity3, activity4, activity5].each do |a|
+        expect(Activity.by(user1)).to include(a)
+      end
+    end
+  end
+
+end