Create followable concern, follow model. Add followable to proposal model.

app/controllers/follows_controller.rb

@@ -0,0 +1,28 @@
+class FollowsController < ApplicationController
+  before_action :authenticate_user!
+  load_and_authorize_resource
+
+  def create
+    @followable = find_followable
+    @follow = Follow.create(user: current_user, followable: @followable)
+    render :refresh_follow_button
+  end
+
+  def destroy
+    @follow = Follow.find(params[:id])
+    @followable = @follow.followable
+    @follow.destroy
+    render :refresh_follow_button
+  end
+
+  private
+
+  def find_followable
+    params.each do |name, value|
+      if name =~ /(.+)_id$/
+        return $1.classify.constantize.find(value)
+      end
+    end
+    nil
+  end
+end

app/helpers/follows_helper.rb

@@ -0,0 +1,28 @@
+module FollowsHelper
+
+  def show_follow_action?(followable)
+    current_user && !followed?(followable)
+  end
+
+  def show_unfollow_action?(followable)
+    current_user && followed?(followable)
+  end
+
+  def follow_entity_text(entity)
+    t('shared.follow_entity', entity: t("activerecord.models.#{entity}.one").downcase)
+  end
+
+  def unfollow_entity_text(entity)
+    t('shared.unfollow_entity', entity: t("activerecord.models.#{entity}.one").downcase)
+  end
+
+  def entity_name(followable)
+    followable.class.name.downcase
+  end
+  private
+
+    def followed?(followable)
+      Follow.followed?(current_user, followable)
+    end
+
+end

app/models/abilities/common.rb

@@ -34,6 +34,8 @@ module Abilities
       can [:flag, :unflag], Proposal
       cannot [:flag, :unflag], Proposal, author_id: user.id
 
+      can [:create, :destroy], Follow
+
       unless user.organization?
         can :vote, Debate
         can :vote, Comment

app/models/concerns/followable.rb

@@ -0,0 +1,8 @@
+module Followable
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :follows, as: :followable
+  end
+
+end

app/models/follow.rb

@@ -0,0 +1,32 @@
+class Follow < ActiveRecord::Base
+  belongs_to :user
+  #TODO Rock&RoR: Check touch usage on cache system
+  belongs_to :followable, polymorphic: true
+
+  validates :user_id, presence: true
+  validates :followable_id, presence: true
+  validates :followable_type, presence: true
+
+  scope(:by_user_and_followable, lambda do |user, followable|
+    where(user_id: user.id,
+          followable_type: followable.class.to_s,
+          followable_id: followable.id)
+  end)
+
+  # def self.follow(user, followable)
+  #   return false if interested?(user, followable)
+  #   create(user: user, followable: followable)
+  # end
+  #
+  # def self.unfollow(user, followable)
+  #   interests = by_user_and_followable(user, followable)
+  #   return false if interests.empty?
+  #   interests.destroy_all
+  # end
+  #
+  def self.followed?(user, followable)
+    return false unless user
+    !! by_user_and_followable(user, followable).try(:first)
+  end
+
+end

app/models/proposal.rb

@@ -8,6 +8,7 @@ class Proposal < ActiveRecord::Base
   include Filterable
   include HasPublicAuthor
   include Graphqlable
+  include Followable
 
   acts_as_votable
   acts_as_paranoid column: :hidden_at

app/models/user.rb

@@ -31,6 +31,7 @@ class User < ActiveRecord::Base
   has_many :direct_messages_sent,     class_name: 'DirectMessage', foreign_key: :sender_id
   has_many :direct_messages_received, class_name: 'DirectMessage', foreign_key: :receiver_id
   has_many :legislation_answers, class_name: 'Legislation::Answer', dependent: :destroy, inverse_of: :user
+  has_many :follows
   belongs_to :geozone
 
   validates :username, presence: true, if: :username_required?

app/views/follows/_followable_button.html.erb

@@ -0,0 +1,20 @@
+<span class="followable-content">
+  <% if show_follow_action? followable %>
+    <a id="follow-expand-<%= entity_name(followable) %>-<%= followable.id %>" data-toggle="follow-drop-<%= entity_name(followable) %>-<%= followable.id %>" title="<%= follow_entity_text(entity_name(followable)) %>">
+      <%= t('shared.follow') %>
+    </a>
+    <div class="dropdown-pane" id="follow-drop-<%= entity_name(followable) %>-<%= followable.id %>" data-dropdown data-auto-focus="true">
+      <%= link_to follow_entity_text(entity_name(followable)), follows_path("#{entity_name(followable)}_id": followable.id), method: :post, remote: true, id: "follow-#{entity_name(followable)}-#{ followable.id }" %>
+    </div>
+  <% end %>
+
+  <% if show_unfollow_action? followable %>
+    <% follow = followable.follows.where(user: current_user).first %>
+    <a id="unfollow-expand-<%= entity_name(followable) %>-<%= followable.id %>" data-toggle="unfollow-drop-<%= entity_name(followable) %>-<%= followable.id %>" title="<%= unfollow_entity_text(entity_name(followable)) %>">
+        <%= t('shared.unfollow') %>
+    </a>
+    <div class="dropdown-pane" id="unfollow-drop-<%= entity_name(followable) %>-<%= followable.id %>" data-dropdown data-auto-focus="true">
+      <%= link_to unfollow_entity_text(entity_name(followable)), follow_path(follow), method: :delete, remote: true, id: "unfollow-#{entity_name(followable)}-#{ followable.id }" %>
+    </div>
+  <% end %>
+</span>

app/views/follows/refresh_follow_button.js.erb

@@ -0,0 +1 @@
+$("#<%= dom_id(@followable) %> .js-follow").html('<%= j render("followable_button", followable: @followable) %>');

app/views/proposals/show.html.erb

@@ -53,6 +53,10 @@
           <span class="js-flag-actions">
             <%= render 'proposals/flag_actions', proposal: @proposal %>
           </span>
+          <span class="bullet">&nbsp;&bull;&nbsp;</span>
+          <span class="js-follow">
+            <%= render 'follows/followable_button', followable: @proposal %>
+          </span>
         </div>
 
         <br>

config/locales/en/general.yml

@@ -500,6 +500,8 @@ en:
     check_none: None
     collective: Collective
     flag: Flag as inappropriate
+    follow: "Follow"
+    follow_entity: "Follow %{entity}"
     hide: Hide
     print:
       print_button: Print this info
@@ -532,6 +534,8 @@ en:
     target_blank_html: " (link opens in new window)"
     you_are_in: "You are in"
     unflag: Unflag
+    unfollow: "Unfollow"
+    unfollow_entity: "Unfollow %{entity}"
     outline:
       debates: Debates
       proposals: Proposals
@@ -708,4 +712,3 @@ en:
   invisible_captcha:
     sentence_for_humans: "If you are human, ignore this field"
     timestamp_error_message: "Sorry, that was too quick! Please resubmit."
-

config/locales/es/general.yml

@@ -500,6 +500,8 @@ es:
     check_none: Ninguno
     collective: Colectivo
     flag: Denunciar como inapropiado
+    follow: "Seguir"
+    follow_entity: "Seguir %{entity}"
     hide: Ocultar
     print:
       print_button: Imprimir esta información
@@ -532,6 +534,8 @@ es:
     target_blank_html: " (se abre en ventana nueva)"
     you_are_in: "Estás en"
     unflag: Deshacer denuncia
+    unfollow: Dejar de seguir
+    unfollow_entity: "Dejar de seguir %{entity}"
     outline:
       debates: Debates
       proposals: Propuestas
@@ -707,4 +711,4 @@ es:
       user_permission_votes: Participar en las votaciones finales*
   invisible_captcha:
     sentence_for_humans: "Si eres humano, por favor ignora este campo"
-    timestamp_error_message: "Eso ha sido demasiado rápido. Por favor, reenvía el formulario."
+    timestamp_error_message: "Eso ha sido demasiado rápido. Por favor, reenvía el formulario."

config/routes.rb

@@ -93,6 +93,8 @@ Rails.application.routes.draw do
     end
   end
 
+  resources :follows, only: [:create, :destroy]
+
   resources :stats, only: [:index]
 
   resources :legacy_legislations, only: [:show], path: 'legislations'

db/migrate/20170626180127_create_follows.rb

@@ -0,0 +1,12 @@
+class CreateFollows < ActiveRecord::Migration
+  def change
+    create_table :follows do |t|
+      t.references :user, index: true, foreign_key: true
+      t.references :followable, polymorphic: true, index: true
+
+      t.timestamps null: false
+    end
+
+    add_index :follows, [:user_id, :followable_type, :followable_id], name: "access_follows"
+  end
+end

db/schema.rb

@@ -326,6 +326,18 @@ ActiveRecord::Schema.define(version: 20170704105112) do
   add_index "flags", ["user_id", "flaggable_type", "flaggable_id"], name: "access_inappropiate_flags", using: :btree
   add_index "flags", ["user_id"], name: "index_flags_on_user_id", using: :btree
 
+  create_table "follows", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "followable_id"
+    t.string   "followable_type"
+    t.datetime "created_at",      null: false
+    t.datetime "updated_at",      null: false
+  end
+
+  add_index "follows", ["followable_type", "followable_id"], name: "index_follows_on_followable_type_and_followable_id", using: :btree
+  add_index "follows", ["user_id", "followable_type", "followable_id"], name: "access_follows", using: :btree
+  add_index "follows", ["user_id"], name: "index_follows_on_user_id", using: :btree
+
   create_table "geozones", force: :cascade do |t|
     t.string   "name"
     t.string   "html_map_coordinates"
@@ -1036,6 +1048,7 @@ ActiveRecord::Schema.define(version: 20170704105112) do
   add_foreign_key "failed_census_calls", "poll_officers"
   add_foreign_key "failed_census_calls", "users"
   add_foreign_key "flags", "users"
+  add_foreign_key "follows", "users"
   add_foreign_key "geozones_polls", "geozones"
   add_foreign_key "geozones_polls", "polls"
   add_foreign_key "identities", "users"

spec/factories.rb

@@ -166,8 +166,8 @@ FactoryGirl.define do
     end
 
     trait :flagged do
-      after :create do |debate|
-        Flag.flag(FactoryGirl.create(:user), debate)
+      after :create do |proposal|
+        Flag.flag(FactoryGirl.create(:user), proposal)
       end
     end
 
@@ -349,6 +349,14 @@ FactoryGirl.define do
     association :user, factory: :user
   end
 
+  factory :follow do
+    association :user, factory: :user
+
+    trait :followed_proposal do
+      association :followable, factory: :proposal
+    end
+  end
+
   factory :comment do
     association :commentable, factory: :debate
     user

spec/features/proposals_spec.rb

@@ -1223,6 +1223,73 @@ feature 'Proposals' do
     expect(Flag.flagged?(user, proposal)).to_not be
   end
 
+  feature "Follows" do
+
+    scenario "Should not show follow button when there is no logged user" do
+      proposal = create(:proposal)
+
+      visit proposal_path(proposal)
+
+      within "#proposal_#{proposal.id}" do
+        expect(page).not_to have_link("Follow citizen proposal")
+      end
+    end
+
+    scenario "Following", :js do
+      user = create(:user)
+      proposal = create(:proposal)
+      login_as(user)
+
+      visit proposal_path(proposal)
+      within "#proposal_#{proposal.id}" do
+        page.find("#follow-expand-proposal-#{proposal.id}").click
+        page.find("#follow-proposal-#{proposal.id}").click
+
+        expect(page).to have_css("#unfollow-expand-proposal-#{proposal.id}")
+      end
+
+      expect(Follow.followed?(user, proposal)).to be
+    end
+
+    scenario "Show unfollow button when user already follow this proposal" do
+      user = create(:user)
+      follow = create(:follow, :followed_proposal, user: user)
+      login_as(user)
+
+      visit proposal_path(follow.followable)
+
+      expect(page).to have_link("Unfollow citizen proposal")
+    end
+
+    scenario "Unfollowing", :js do
+      user = create(:user)
+      proposal = create(:proposal)
+      follow = create(:follow, :followed_proposal, user: user, followable: proposal)
+      login_as(user)
+
+      visit proposal_path(proposal)
+      within "#proposal_#{proposal.id}" do
+        page.find("#unfollow-expand-proposal-#{proposal.id}").click
+        page.find("#unfollow-proposal-#{proposal.id}").click
+
+        expect(page).to have_css("#follow-expand-proposal-#{proposal.id}")
+      end
+
+      expect(Follow.followed?(user, proposal)).not_to be
+    end
+
+    scenario "Show follow button when user is not following this proposal" do
+      user = create(:user)
+      proposal = create(:proposal)
+      login_as(user)
+
+      visit proposal_path(proposal)
+
+      expect(page).to have_link("Follow citizen proposal")
+    end
+
+  end
+
   scenario 'Erased author' do
     user = create(:user)
     proposal = create(:proposal, author: user)

spec/models/follow_spec.rb

@@ -0,0 +1,134 @@
+require 'rails_helper'
+
+describe Follow do
+
+  let(:follow) { build(:follow, :followed_proposal) }
+
+  # it_behaves_like "has_public_author"
+
+  it "should be valid" do
+    expect(follow).to be_valid
+  end
+
+  it "should not be valid without an user_id" do
+    follow.user_id = nil
+    expect(follow).to_not be_valid
+  end
+
+  it "should not be valid without an followable_id" do
+    follow.followable_id = nil
+    expect(follow).to_not be_valid
+  end
+
+  it "should not be valid without an followable_type" do
+    follow.followable_type = nil
+    expect(follow).to_not be_valid
+  end
+
+
+  # describe "proposal" do
+  #
+  #   let(:proposal) { create(:proposal) }
+  #
+  #   describe 'create' do
+  #
+  #     it 'creates a interest when there is none' do
+  #       expect { described_class.follow(user, proposal) }.to change{ Interest.count }.by(1)
+  #       expect(Interest.last.user).to eq(user)
+  #       expect(Interest.last.interestable).to eq(proposal)
+  #     end
+  #
+  #     it 'does nothing if the interest already exists' do
+  #       described_class.follow(user, proposal)
+  #       expect(described_class.follow(user, proposal)).to eq(false)
+  #       expect(Interest.by_user_and_interestable(user, proposal).count).to eq(1)
+  #     end
+  #
+  #     it 'increases the interest count' do
+  #       expect { described_class.follow(user, proposal) }.to change{ proposal.reload.interests_count }.by(1)
+  #     end
+  #   end
+  #
+  #   describe 'destroy' do
+  #     it 'raises an error if the interest does not exist' do
+  #       expect(described_class.unfollow(user, proposal)).to eq(false)
+  #     end
+  #
+  #     describe 'when the interest already exists' do
+  #       before(:each) { described_class.follow(user, proposal) }
+  #
+  #       it 'removes an existing interest' do
+  #         expect { described_class.unfollow(user, proposal) }.to change{ Interest.count }.by(-1)
+  #       end
+  #
+  #       it 'decreases the interest count' do
+  #         expect { described_class.unfollow(user, proposal) }.to change{ proposal.reload.interests_count }.by(-1)
+  #       end
+  #     end
+  #   end
+  #
+  #   describe '.interested?' do
+  #     it 'returns false when the user has not flagged the proposal' do
+  #       expect(described_class.interested?(user, proposal)).to_not be
+  #     end
+  #
+  #     it 'returns true when the user has interested the proposal' do
+  #       described_class.follow(user, proposal)
+  #       expect(described_class.interested?(user, proposal)).to be
+  #     end
+  #   end
+  # end
+  #
+  # describe "debate" do
+  #
+  #   let(:debate) { create(:debate) }
+  #
+  #   describe 'create' do
+  #
+  #     it 'creates a interest when there is none' do
+  #       expect { described_class.follow(user, debate) }.to change{ Interest.count }.by(1)
+  #       expect(Interest.last.user).to eq(user)
+  #       expect(Interest.last.interestable).to eq(debate)
+  #     end
+  #
+  #     it 'does nothing if the interest already exists' do
+  #       described_class.follow(user, debate)
+  #       expect(described_class.follow(user, debate)).to eq(false)
+  #       expect(Interest.by_user_and_interestable(user, debate).count).to eq(1)
+  #     end
+  #
+  #     it 'increases the interest count' do
+  #       expect { described_class.follow(user, debate) }.to change{ debate.reload.interests_count }.by(1)
+  #     end
+  #   end
+  #
+  #   describe 'destroy' do
+  #     it 'raises an error if the interest does not exist' do
+  #       expect(described_class.unfollow(user, debate)).to eq(false)
+  #     end
+  #
+  #     describe 'when the interest already exists' do
+  #       before(:each) { described_class.follow(user, debate) }
+  #
+  #       it 'removes an existing interest' do
+  #         expect { described_class.unfollow(user, debate) }.to change{ Interest.count }.by(-1)
+  #       end
+  #
+  #       it 'decreases the interest count' do
+  #         expect { described_class.unfollow(user, debate) }.to change{ debate.reload.interests_count }.by(-1)
+  #       end
+  #     end
+  #   end
+  #
+  #   describe '.interested?' do
+  #     it 'returns false when the user has not flagged the debate' do
+  #       expect(described_class.interested?(user, debate)).to_not be
+  #     end
+  #
+  #     it 'returns true when the user has interested the debate' do
+  #       described_class.follow(user, debate)
+  #       expect(described_class.interested?(user, debate)).to be
+  #     end
+  #   end
+  # end
+end