Add comments export

app/controllers/export/comments_controller.rb

@@ -0,0 +1,10 @@
+module Export
+  class CommentsController < ApplicationController
+    def index
+        comments = Comment.joins(:post).where(status: "public", comments: {status: "public"})
+        respond_to do |format|
+            format.csv { send_data comments.to_csv, filename: "comments-#{DateTime.now.strftime("%d%m%Y%H%M")}.csv"}
+        end
+    end
+  end
+end

app/models/comment.rb

@@ -1,4 +1,15 @@
+require 'csv'
+
 class Comment < ApplicationRecord
   include Visible
   belongs_to :post
+
+  def self.to_csv
+    CSV.generate do |csv|
+      csv << ["Post title", "Comment author", "Comment body"]
+      all.each do |comment|
+        csv << [comment.post.title, comment.author, comment.body]
+      end
+    end
+  end
 end

app/views/posts/index.html.erb

@@ -5,6 +5,12 @@
 
 <h1 align="center">Listing all articles</h1>
 
+<div class="row" style="margin-bottom: 12px;">
+  <div class="col-md-4 col-xs-8 col-xs-offset-2">
+    <%= link_to "Export", export_comments_path(format: 'csv'), class: "btn btn-primary" %>
+  </div>
+</div>
+
 <% @posts.each do |post| %>
   <%unless post.archived?%>
  <div class="row">

config/routes.rb

@@ -12,4 +12,8 @@
   resources :posts do
     resources :comments
   end
+
+  namespace :export do
+    resources :comments, only: :index
+  end
 end

test/fixtures/comments.yml

@@ -1,11 +1,13 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
 one:
-  author: MyString
-  body: MyText
+  author: Author
+  body: Body
   post: one
+  status: public
 
 two:
   author: MyString
   body: MyText
   post: two
+  status: private

test/fixtures/posts.yml

@@ -1,7 +1,7 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
 one:
-  title: MyString
+  title: Title1
   body: MyText
 
 two:

test/fixtures/users.yml

@@ -1,11 +1,11 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
-one:
-  name: MyString
-  age: 1
-  occupation: MyString
+# one:
+#   name: MyString
+#   age: 1
+#   occupation: MyString
 
-two:
-  name: MyString
-  age: 1
-  occupation: MyString
+# two:
+#   name: MyString
+#   age: 1
+#   occupation: MyString

test/models/comment_test.rb

@@ -1,7 +1,10 @@
 require "test_helper"
 
 class CommentTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  test "to csv" do
+    assert_equal(
+      "Post title,Comment author,Comment body\nTitle1,Author,Body\n",
+      posts(:one).comments.to_csv
+    )
+  end
 end