include ability to unfollow from email

app/controllers/maps_controller.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 class MapsController < ApplicationController
   before_action :require_user, only: [:create, :update, :destroy, :events, :follow, :unfollow]
-  before_action :set_map, only: [:show, :conversation, :update, :destroy, :contains, :events, :export, :follow, :unfollow]
+  before_action :set_map, only: [:show, :conversation, :update, :destroy, :contains, :events, :export, :follow, :unfollow, :unfollow_from_email]
   after_action :verify_authorized
 
   # GET maps/:id
@@ -164,6 +164,17 @@ class MapsController < ApplicationController
     end
   end
 
+  # GET maps/:id/unfollow_from_email
+  def unfollow_from_email
+    FollowService.unfollow(@map, current_user)
+
+    respond_to do |format|
+      format.html do
+        redirect_to map_path(@map), notice: 'You are no longer following this map'
+      end
+    end
+  end
+
   private
 
   def set_map

app/controllers/topics_controller.rb

@@ -3,7 +3,9 @@ class TopicsController < ApplicationController
   include TopicsHelper
 
   before_action :require_user, only: [:create, :update, :destroy, :follow, :unfollow]
-  before_action :set_topic, only: [:show, :update, :relative_numbers, :relatives, :network, :destroy, :follow, :unfollow]
+  before_action :set_topic, only: [:show, :update, :relative_numbers,
+                                   :relatives, :network, :destroy,
+                                   :follow, :unfollow, :unfollow_from_email]
   after_action :verify_authorized, except: :autocomplete_topic
 
   respond_to :html, :js, :json
@@ -185,6 +187,17 @@ class TopicsController < ApplicationController
     end
   end
 
+  # GET topics/:id/unfollow_from_email
+  def unfollow_from_email
+    FollowService.unfollow(@topic, current_user)
+
+    respond_to do |format|
+      format.html do
+        redirect_to topic_path(@topic), notice: 'You are no longer following this topic'
+      end
+    end
+  end
+
   private
 
   def set_topic

app/views/topic_mailer/_unfollow.html.erb

@@ -0,0 +1,4 @@
+<hr>
+<% topic = @entity || entity %>
+You are receiving this email because you are following this topic.
+<%= link_to 'Unfollow', unfollow_from_email_topic_url(topic) %>

app/views/topic_mailer/_unfollow.text.erb

@@ -0,0 +1,3 @@
+<% topic = @entity || entity %>
+You are receiving this email because you are following this topic.
+To unfollow, go to: <%= unfollow_from_email_topic_url(topic) %>

app/views/topic_mailer/added_to_map.html.erb

@@ -9,3 +9,5 @@
 
 <%= link_to 'Go to Topic', topic_url(topic), style: button_style %>
 <%= link_to 'Go to Map', map_url(event.map), style: button_style %>
+
+<%= render :partial => 'topic_mailer/unfollow' %>

app/views/topic_mailer/added_to_map.text.erb

@@ -4,3 +4,5 @@
 
 topic_url(topic)
 map_url(event.map)
+
+<%= render :partial => 'topic_mailer/unfollow' %>

app/views/topic_mailer/connected.html.erb

@@ -13,3 +13,5 @@
 </p>
 
 <%= link_to 'View the connection', topic_url(topic1), style: button_style %>
+
+<%= render :partial => 'topic_mailer/unfollow' %>

app/views/topic_mailer/connected.text.erb

@@ -6,3 +6,5 @@
 <%= synapse.desc.length > 0 ? ' with the description' + synapse.desc : '' %>
 
 <%= topic_url(topic1) %>
+
+<%= render :partial => 'topic_mailer/unfollow' %>

config/routes.rb

@@ -50,6 +50,7 @@ Metamaps::Application.routes.draw do
       post :unstar, to: 'stars#destroy', default: { format: :json }
       post :follow, default: { format: :json }
       post :unfollow, default: { format: :json }
+      get  :unfollow_from_email
     end
   end
 
@@ -87,6 +88,7 @@ Metamaps::Application.routes.draw do
       get :relatives
       post :follow, default: { format: :json }
       post :unfollow, default: { format: :json }
+      get  :unfollow_from_email
     end
     collection do
       get :autocomplete_topic

spec/mailers/previews/map_mailer_preview.rb

@@ -6,12 +6,12 @@ class MapMailerPreview < ActionMailer::Preview
     MapMailer.invite_to_edit(user_map)
   end
 
-  def access_request_email
+  def access_request
     request = AccessRequest.first
     MapMailer.access_request(request)
   end
 
-  def access_approved_email
+  def access_approved
     request = AccessRequest.first
     MapMailer.access_approved(request)
   end

spec/mailers/previews/topic_mailer_preview.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+# Preview all emails at http://localhost:3000/rails/mailers/topic_mailer
+class TopicMailerPreview < ActionMailer::Preview
+  def added_to_map
+    event = Event.where(kind: 'topic_added_to_map').first
+    user = User.first
+    TopicMailer.added_to_map(event, user)
+  end
+
+  def connected
+    synapse = Synapse.first
+    topic = synapse.topic1
+    user = User.first
+    TopicMailer.connected(synapse, topic, user)
+  end
+end