{"id":3239,"date":"2018-02-17T02:55:06","date_gmt":"2018-02-17T02:55:06","guid":{"rendered":"https:\/\/www.botreetechnologies.com\/blog\/?p=3239"},"modified":"2022-12-13T16:30:58","modified_gmt":"2022-12-13T11:00:58","slug":"compare-text-differences-between-two-contents-using-ruby-on-rails","status":"publish","type":"post","link":"https:\/\/www.botreetechnologies.com\/blog\/compare-text-differences-between-two-contents-using-ruby-on-rails\/","title":{"rendered":"Compare Text Differences Between Two Contents (%) Using Ruby on Rails"},"content":{"rendered":"\n

Requirement:<\/b> Compare two contents (HTML, JavaScript code or any other text) and find text difference in percentage(%) between them.<\/i><\/p>\n\n\n\n

Technology:<\/b> Ruby on Rails<\/i><\/p>\n\n\n\n

Versions:<\/b> Rails: 5.1.4 , Ruby: 2.4.1 (would work with almost any version)<\/i><\/p>\n\n\n\n

Git Repo:<\/b> https:\/\/github.com\/AnkurVyas-BTC\/compare<\/a><\/i><\/p>\n\n\n\n

We are going to build something like below.<\/p>\n\n\n\n

\"DifferenceDifference Comparison (%)<\/h6>\n\n\n\n

For this we are going to use string metric<\/a> called as Levenshtein distance<\/a>.<\/p>\n\n\n

\n
\"virus<\/figure>\n<\/div>\n\n\n
PC: https:\/\/www.memecenter.com\/fun\/1057701\/virus-elaboration<\/h6>\n\n\n\n

Okay sir !!!<\/p>\n\n\n\n

In information theory<\/a>, Linguistics<\/a> and computer science<\/a>, the Levenshtein distance<\/b> is a string metric<\/a> for measuring the difference between two sequences. It is named after Vladimir Levenshtein<\/a>, who considered this distance in 1965.<\/p>\n\n\n\n

Informally, the Levenshtein distance between two words is the minimum number of single-character edits (insertions, deletions or substitutions) required to change one word into the other.<\/i><\/p><\/blockquote>\n\n\n\n

For this, we are going to use text<\/a> gem. Let’s start creating our app.<\/p>\n\n\n\n

$ rails new compare<\/code><\/p><\/blockquote>\n\n\n\n

This will create our rails app with name compare<\/i>.<\/p>\n\n\n\n

Then move to our app directory and install the dependencies.<\/p>\n\n\n\n

$ bundle install<\/code><\/p><\/blockquote>\n\n\n\n

If above command gives you an error you may need install bundler gem for this.<\/p>\n\n\n\n

$ gem install bundler<\/code><\/p><\/blockquote>\n\n\n\n

Now your rails app is ready. Let’s add text<\/i> gem to our app. Open Gemfile<\/i> and write following line to add gem.<\/p>\n\n\n\n

gem 'text'<\/code><\/p><\/blockquote>\n\n\n\n

Again do bundle install<\/code><\/i> to install the gem.<\/p>\n\n\n\n

Let’s create controller now by the following command.<\/p>\n\n\n\n

$ rails g controller comparisons compare<\/code><\/p><\/blockquote>\n\n\n\n

This will generate following files.<\/p>\n\n\n

\n
\"comparison<\/figure>\n<\/div>\n\n\n
Output of comparison controller generation!<\/h6>\n\n\n\n

Add the routes at config\/routes.rb<\/i><\/p>\n\n\n\n

Rails.application.routes.draw do<\/code><\/p>

get ‘comparisons\/compare’<\/p>

post ‘comparisons\/compare_sections’<\/p>

root to: ‘comparisons#compare’<\/p>

end<\/p><\/blockquote>\n\n\n\n

Now go to controllers\/comparisons_controller.rb<\/code><\/i> file and paste following contents.<\/p>\n\n\n\n