Make subscriptions insert-only

app/controllers/comments_controller.rb

@@ -123,7 +123,8 @@ class CommentsController < ApplicationController
     request_for_comment.commenters.each do |commenter|
       subscriptions = Subscription.where(
           :request_for_comment_id => request_for_comment.id,
-          :user_id => commenter.id, :user_type => commenter.class.name)
+          :user_id => commenter.id, :user_type => commenter.class.name,
+          :deleted => false)
       subscriptions.each do |subscription|
         if (subscription.subscription_type == 'author' and current_user == request_for_comment.user) or subscription.subscription_type == 'all'
           if subscription.user != current_user

app/controllers/subscriptions_controller.rb

@@ -32,7 +32,8 @@ class SubscriptionsController < ApplicationController
     else
       authorize!
       rfc = @subscription.try(:request_for_comment)
-      if @subscription.destroy
+      @subscription.deleted = true
+      if @subscription.save
         respond_to do |format|
           format.html { redirect_to request_for_comment_url(rfc), notice: t('subscriptions.successfully_unsubscribed') }
           format.json { render json: {message: t('subscriptions.successfully_unsubscribed')}, status: :ok}
@@ -55,7 +56,7 @@ class SubscriptionsController < ApplicationController
   def subscription_params
     current_user_id = current_user.try(:id)
     current_user_class_name = current_user.try(:class).try(:name)
-    params[:subscription].permit(:request_for_comment_id, :subscription_type).merge(user_id: current_user_id, user_type: current_user_class_name)
+    params[:subscription].permit(:request_for_comment_id, :subscription_type).merge(user_id: current_user_id, user_type: current_user_class_name, deleted: false)
   end
   private :subscription_params
 end

app/views/exercises/_comment_dialogcontent.html.slim

@@ -2,7 +2,7 @@
   h5 =t('exercises.implement.comment.others')
   .container
   label
-    input#subscribe type='checkbox' title=t('request_for_comments.subscribe_to_author') data-subscription=Subscription.where(user: current_user, request_for_comment_id: @request_for_comment.id).try(:first).try(:id)
+    input#subscribe type='checkbox' title=t('request_for_comments.subscribe_to_author') data-subscription=Subscription.where(user: current_user, request_for_comment_id: @request_for_comment.id, subscription_type: 'author', deleted: false).try(:first).try(:id)
     = t('request_for_comments.subscribe_to_author')
 
 #myComment

db/migrate/20170920145852_add_deleted_to_subscription.rb

@@ -0,0 +1,5 @@
+class AddDeletedToSubscription < ActiveRecord::Migration
+  def change
+    add_column :subscriptions, :deleted, :boolean
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170913054203) do
+ActiveRecord::Schema.define(version: 20170920145852) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -288,6 +288,7 @@ ActiveRecord::Schema.define(version: 20170913054203) do
     t.string   "subscription_type"
     t.datetime "created_at",             null: false
     t.datetime "updated_at",             null: false
+    t.boolean  "deleted"
   end
 
   create_table "tags", force: :cascade do |t|