Liam Hurst

Liam Hurst

1564545000

How To Use PostgreSQL with Your Ruby on Rails Application on macOS

In this tutorial, you will set up a Ruby on Rails development environment connected to a PostgreSQL database on a local macOS machine. You will install and configure PostgreSQL, and then test your setup by creating a Rails application that uses PostgreSQL as its database server.

Introduction

When using the Ruby on Rails web framework, your application is set up by default to use SQLite as a database. SQLite is a lightweight, portable, and user-friendly relational database that performs especially well in low-memory environments, and will work well in many cases. However, for highly complex applications that need more reliable data integrity and programmatic extensibility, a PostgreSQL database will be a more robust and flexible choice. In order to configure your Ruby on Rails setup to use PostgreSQL, you will need to perform a few additional steps to get it up and running.

Prerequisites

This tutorial requires the following:

  • One computer or virtual machine with macOS installed, with administrative access to that machine and an internet connection.
  • A Ruby on Rails development environment installed on your macOS machine. To set this up, follow our guide on How To Install Ruby on Rails with rbenv on macOS. This tutorial will use version 2.6.3 of Ruby and 5.2.3 of Rails; for information on the latest versions, check out the official sites for Ruby and Rails.

Step 1 — Installing PostgreSQL

In order to configure Ruby on Rails to create your web application with PostgreSQL as a database, you will first install the database onto your machine. Although there are many ways to install PostgreSQL on macOS, this tutorial will use the package manager Homebrew.

There are multiple Homebrew packages to install different versions of PostgreSQL. To install the latest version, run the following command:

brew install postgresql

If you would like to download a specific version of PostgreSQL, replace postgresql in the previous command with your desired package. You can find the available packages at the Homebrew website.

Next, include the PostgreSQL binary in your PATH variable in order to access the PostgreSQL command line tools, making sure to replace the 10 with the version number you are using:

echo 'export PATH="/usr/local/opt/postgresql@10/bin:$PATH"' >> ~/.bash_profile

Then, apply the changes you made to your ~/.bash_profile file to your current shell session:

source ~/.bash_profile

To start the service and enable it to start at login, run the following:

brew services start postgresql@10

Check to make sure the installation was successful:

postgres -V

You will get the following output:

Output
postgres (PostgreSQL) 10.9 

Once PostgreSQL is installed, the next step is to create a role that your Rails application will use later to create your database.

Step 2 — Creating a Database Role for Your Application

In PostgreSQL, roles can be used to organize permissions and authorization. When starting PostgreSQL with Homebrew, you will automatically have a superuser role created with your macOS username. In order to keep these superuser privileges separate from the database instance you use for your Rails application, in this step you will create a new role with less access.

To create a new role, run the following command, replacing appname with whatever name you’d like to give the role:

createuser -P -d appname

In this command, you used createuser to create a role named appname. The -d flag gave the role the permission to create new databases.

You also specified the -P flag, which means you will be prompted to enter a password for your new role. Enter your desired password, making sure to record it so that you can use it in a configuration file in a future step.

If you did not use the -P flag and want to set a password for the role after you create it, enter the PostgreSQL console with the following command:

psql postgres

You will receive the following output, along with the prompt for the PostgreSQL console:

Output
psql (10.9)
Type "help" for help.
 
postgres=#

The PostgreSQL console is indicated by the postgres=# prompt. At the PostgreSQL prompt, enter this command to set the password for the new database role, replacing the highlighted name with the one you created:

\password appname

PostgreSQL will prompt you for a password. Enter your desired password at the prompt, then confirm it.

Now, exit the PostgreSQL console by entering this command:

\q

Your usual prompt will now reappear.

In this step, you created a new PostgreSQL role without superuser privileges for your application. Now you are ready to create a new Rails app that uses this role to create a database.

Step 3 — Creating a New Rails Application

With your role configured for PostgreSQL, you can now create a new Rails application that is set up to use PostgreSQL as a database.

First, navigate to your home directory:

cd ~

Create a new Rails application in this directory, replacing appname with whatever you would like to call your app:

rails new appname -d=postgresql

The -d=postgresql option sets PostgreSQL as the database.

Once you’ve run this command, a new folder named appname will appear in your home directory, containing all the elements of a basic Rails application.

Next, move into the application’s directory:

cd appname

Now that you have created a new Rails application and have moved into the root directory for your project, you can configure and create your PostgreSQL database from within your Rails app.

Step 4 — Configuring and Creating Your Database

When creating the development and test databases for your application, Rails will use the PostgreSQL role that you created in Step 2. To make sure that Rails creates these databases, you will alter the database configuration file of your project. You will then create your databases.

One of the configuration changes to make in your Rails application is to add the password for the PostgreSQL role you created in the last step. To keep sensitive information like passwords safe, it is a good idea to store this in an environment variable rather than to write it directly in your configuration file.

To store your password in an environment variable at login, run the following command, replacing APPNAME with the name of your app and PostgreSQL_Role_Password with the password you created in the last step:

echo 'export APPNAME_DATABASE_PASSWORD="PostgreSQL_Role_Password"' >> ~/.bash_profile

This command writes the export command to your ~/.bash_profile file so that the environment variable will be set at login.

To export the variable for your current session, use the source command:

source ~/.bash_profile

Now that you have stored your password in your environment, it’s time to alter the configuration file.

Open your application’s database configuration file in your preferred text editor. This tutorial will use nano:

nano config/database.yml

Under the default section, find the line that says pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> and add the following highlighted lines, filling in your credentials and the environment variable you created. It should look something like this:

config/database.yml

...
default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  # http://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: appname
  password: <%= ENV['APPNAME_DATABASE_PASSWORD'] %>
 
development:
  <<: *default
  database: appname_development
...

This will make the Rails application run the database with the correct role and password. Save and exit by pressing CTRL+X, Y, then ENTER.

For more information on configuring databases in Rails, see the Rails documentation.

Now that you have made changes to config/database.yml, create your application’s databases by using the rails command:

rails db:create

Once Rails creates the database, you will receive the following output:

Output
Created database 'appname_development' 
Created database 'appname_test' 

As the output suggests, this command created a development and test database in your PostgreSQL server.

You now have a PostgreSQL database connected to your Rails app. To ensure that your application is working, the next step is to test your configuration.

Step 5 — Testing Your Configuration

To test that your application is able to use the PostgreSQL database, try to run your web application so that it will show up in a browser.

First, you’ll use the built-in web server for Rails, Puma, to serve your application. This web server comes with Rails automatically and requires no additional setup. To serve your application, run the following command:

rails server --binding=127.0.0.1

--binding binds your application to a specified IP. By default, this flag will bind Rails to 0.0.0.0, but since this means that Rails will listen to all interfaces, it is more secure to use 127.0.0.1 to specify the localhost. By default, the application listens on port 3000.

Once your Rails app is running, your command prompt will disappear, replaced by this output:

Output
=> Booting Puma
=> Rails 5.2.3 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.1 (ruby 2.6.3-p62), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://127.0.0.1:3000
Use Ctrl-C to stop 

To test if your application is running, open up a new terminal window on your server and use the curl command to send a request to 127.0.0.1:3000:

curl http://127.0.0.1:3000

You will receive a lot of output in HTML, ending in something like:

Output
...
        <strong>Rails version:</strong> 5.2.3<br />
        <strong>Ruby version:</strong> 2.6.3 (x86_64-darwin18)
      </p>
    </section>
  </div>
</body>
</html>

You can also access your Rails application in a local web browser by visiting:

http://127.0.0.1:3000

At this URL, you will find a Ruby on Rails welcome page:

This means that your application is properly configured and connected to the PostgreSQL database.

Conclusion

In this tutorial, you created a Ruby on Rails web application that was configured to use PostgreSQL as a database on a local macOS machine.

#postgresql #ruby-on-rails #ruby #macos #database

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How To Use PostgreSQL with Your Ruby on Rails Application on macOS
Shardul Bhatt

Shardul Bhatt

1618576835

Why should we use Ruby on Rails for Software Development?

What is Rails, Ruby on Rails?

Rails is a server-side web application development framework written in the Ruby programming language. Its emergence in 2005 has influenced and impacted web application development to a vast range, including but not limited to seamless database tables, migrations, and scaffolding of views. In the simplest understanding, Rails is a highly productive and intuitive software developer. 

Websites and applications of any complexity can be achieved with Ruby on Rails. The software is designed to perceive the needs of ruby on rails developers and encourage them with the best way out. It is designed to allow developers to write lesser code while spiking productivity much more than any other framework or language. Ruby on Rails rapid application development offers everyday web development tasks easier and uniquely out-of-the-box, both with the same effectiveness.

The Ruby on Rails framework is based on two philosophies:

 

  • Don’t Repeat Yourself (DRY): It is a software development principle that ensures that every piece or entity of knowledge must be assigned with a single and unambiguous representation within a development system.

    It not only reduces the need to write lengthy codes but also eliminates the repetitive writing of codes. As a result, it provides a much more manageable web app development with the least possible bugs.

 

  • Convention over Configuration (CoC): It indicates the highly opinionated feature that the Ruby on Rails framework possesses. It offers ready-made solutions or the “best way out” for many tasks in a web application and defaults them to the convention without the need for external specification. The programmer using the software is required to specify only the unconventional aspects of the web application. 

Some of the commonly known websites built by the Ruby on Rails software developers are Instacart, Scribd, Shopify, Github, ConvertKit, Soundcloud, GoodReads, Airbnb. It finds its application in Sa-as Solutions, Social Networking Platforms, Dating websites, Stock Exchange Platforms, etc.  

Read more: Why Ruby on Rails is Perfect for eCommerce Web Development

Why use Ruby on Rails: The multifold benefits

  • Community and its abundant resources 

    • There is a large community that is dedicated to Ruby on Rails that keeps it up-to-date and indeed encourages its family of developers to continue using it. They make sure the benefits are soaring with every update they make. 

    • The community is committed to developing several ready-to-use code packages, commonly known as gems, for its users. They discuss and announce new project launches, help each other with queries, and engage in framework discussions and betterment. While Ruby on Rails helps developers in rapid application development, it also connects and grows businesses together.

  • Project Scalability

    • To talk about scalability, we indicate the ability to grow and manage more and more user requests per minute (RPM). However, this depends on the architecture rather than the framework. The right architecture of Ruby on Rails web application development allows it to write bulky codes and programs as compared to early-stage difficulties with scalability. 

    • It uses the Representational State Transfer (REST) architecture. This will enable Rails to create efficient web applications based on Rails 6, launched last year in 2020, which addresses most scalability issues. The portable components are agile and help in a better understanding of new requirements and needful adaptations for any business. The framework and architecture allow both vertical and horizontal scalability.

  • Fast Application Development and Cost Effectiveness

    • Ruby on Rails is lucid, logical, and has lean code requirements, thereby cutting down redundancy and improving the overall development speed. Lesser amount of code is proportional to lesser time investment with optimal results. The more time it takes for development, the more expensive it becomes for the end customers.

    • Considering the ready-made code modules/packages (gems) available, Ruby on Rails development company will less time and money are spent creating and modifying Rails websites and applications. Another advantage that has made Ruby on Rails super attractive for startups is its use of Model-View-Controller (MVC) architecture. It has a component separation scheme that speeds up the web development process and fixes any errors that occur.  

  • Data Protection

    • Rails framework and the Ruby on Rails community put in a lot of efforts for data protection and security of its customer base. It is also one of the efficient frameworks for developing database-backed applications. 

    • The developers at Ruby on Rails cover many aspects of cybersecurity, including encryptions of  passwords, credit card information, and users’ personal database. Special measures are taken to prevent the framework from SQL injections and XSS attacks. 

  • Ruby on Rails Enterprise Application Development

    • Ruby on Rails simplifies the daily operations and lowers the cost of enterprise app developments. The prominent features include data management, seamless updating of applications, easy and efficient code development, and high scalability, as discussed above. 

    • Ruby on Rails enterprise application development is preferred by companies and is slightly cost-intensive. It can be easily integrated with third-party apps like Oracle Business, Oracle, Windows services, and others. Ruby enterprise app development allows the developers and programmers to solve the problems at the root level, given its transparency.

Ruby on Rails V/S Django

Checkout Blog on Django vs Ruby on Rails Comparison

Bottom Line

There are several reasons to prefer Ruby on Rails discussed above and extend further to early detection of errors, reduced time to market, and easy adaptation for API developments. It makes web programming much easier and simplifies website building of any complexity. Its flexibility and acceptance among new developers and programmers make it the perfect, one-stop choice for software application development company in 2021. 

Source: https://techsite.io/p/2121044

#ruby on rails examples #ruby on rails rapid application development #ruby on rails web application development #ruby on rails software developer #ruby on rails enterprise application development

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Liam Hurst

Liam Hurst

1564545000

How To Use PostgreSQL with Your Ruby on Rails Application on macOS

In this tutorial, you will set up a Ruby on Rails development environment connected to a PostgreSQL database on a local macOS machine. You will install and configure PostgreSQL, and then test your setup by creating a Rails application that uses PostgreSQL as its database server.

Introduction

When using the Ruby on Rails web framework, your application is set up by default to use SQLite as a database. SQLite is a lightweight, portable, and user-friendly relational database that performs especially well in low-memory environments, and will work well in many cases. However, for highly complex applications that need more reliable data integrity and programmatic extensibility, a PostgreSQL database will be a more robust and flexible choice. In order to configure your Ruby on Rails setup to use PostgreSQL, you will need to perform a few additional steps to get it up and running.

Prerequisites

This tutorial requires the following:

  • One computer or virtual machine with macOS installed, with administrative access to that machine and an internet connection.
  • A Ruby on Rails development environment installed on your macOS machine. To set this up, follow our guide on How To Install Ruby on Rails with rbenv on macOS. This tutorial will use version 2.6.3 of Ruby and 5.2.3 of Rails; for information on the latest versions, check out the official sites for Ruby and Rails.

Step 1 — Installing PostgreSQL

In order to configure Ruby on Rails to create your web application with PostgreSQL as a database, you will first install the database onto your machine. Although there are many ways to install PostgreSQL on macOS, this tutorial will use the package manager Homebrew.

There are multiple Homebrew packages to install different versions of PostgreSQL. To install the latest version, run the following command:

brew install postgresql

If you would like to download a specific version of PostgreSQL, replace postgresql in the previous command with your desired package. You can find the available packages at the Homebrew website.

Next, include the PostgreSQL binary in your PATH variable in order to access the PostgreSQL command line tools, making sure to replace the 10 with the version number you are using:

echo 'export PATH="/usr/local/opt/postgresql@10/bin:$PATH"' >> ~/.bash_profile

Then, apply the changes you made to your ~/.bash_profile file to your current shell session:

source ~/.bash_profile

To start the service and enable it to start at login, run the following:

brew services start postgresql@10

Check to make sure the installation was successful:

postgres -V

You will get the following output:

Output
postgres (PostgreSQL) 10.9 

Once PostgreSQL is installed, the next step is to create a role that your Rails application will use later to create your database.

Step 2 — Creating a Database Role for Your Application

In PostgreSQL, roles can be used to organize permissions and authorization. When starting PostgreSQL with Homebrew, you will automatically have a superuser role created with your macOS username. In order to keep these superuser privileges separate from the database instance you use for your Rails application, in this step you will create a new role with less access.

To create a new role, run the following command, replacing appname with whatever name you’d like to give the role:

createuser -P -d appname

In this command, you used createuser to create a role named appname. The -d flag gave the role the permission to create new databases.

You also specified the -P flag, which means you will be prompted to enter a password for your new role. Enter your desired password, making sure to record it so that you can use it in a configuration file in a future step.

If you did not use the -P flag and want to set a password for the role after you create it, enter the PostgreSQL console with the following command:

psql postgres

You will receive the following output, along with the prompt for the PostgreSQL console:

Output
psql (10.9)
Type "help" for help.
 
postgres=#

The PostgreSQL console is indicated by the postgres=# prompt. At the PostgreSQL prompt, enter this command to set the password for the new database role, replacing the highlighted name with the one you created:

\password appname

PostgreSQL will prompt you for a password. Enter your desired password at the prompt, then confirm it.

Now, exit the PostgreSQL console by entering this command:

\q

Your usual prompt will now reappear.

In this step, you created a new PostgreSQL role without superuser privileges for your application. Now you are ready to create a new Rails app that uses this role to create a database.

Step 3 — Creating a New Rails Application

With your role configured for PostgreSQL, you can now create a new Rails application that is set up to use PostgreSQL as a database.

First, navigate to your home directory:

cd ~

Create a new Rails application in this directory, replacing appname with whatever you would like to call your app:

rails new appname -d=postgresql

The -d=postgresql option sets PostgreSQL as the database.

Once you’ve run this command, a new folder named appname will appear in your home directory, containing all the elements of a basic Rails application.

Next, move into the application’s directory:

cd appname

Now that you have created a new Rails application and have moved into the root directory for your project, you can configure and create your PostgreSQL database from within your Rails app.

Step 4 — Configuring and Creating Your Database

When creating the development and test databases for your application, Rails will use the PostgreSQL role that you created in Step 2. To make sure that Rails creates these databases, you will alter the database configuration file of your project. You will then create your databases.

One of the configuration changes to make in your Rails application is to add the password for the PostgreSQL role you created in the last step. To keep sensitive information like passwords safe, it is a good idea to store this in an environment variable rather than to write it directly in your configuration file.

To store your password in an environment variable at login, run the following command, replacing APPNAME with the name of your app and PostgreSQL_Role_Password with the password you created in the last step:

echo 'export APPNAME_DATABASE_PASSWORD="PostgreSQL_Role_Password"' >> ~/.bash_profile

This command writes the export command to your ~/.bash_profile file so that the environment variable will be set at login.

To export the variable for your current session, use the source command:

source ~/.bash_profile

Now that you have stored your password in your environment, it’s time to alter the configuration file.

Open your application’s database configuration file in your preferred text editor. This tutorial will use nano:

nano config/database.yml

Under the default section, find the line that says pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> and add the following highlighted lines, filling in your credentials and the environment variable you created. It should look something like this:

config/database.yml

...
default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  # http://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: appname
  password: <%= ENV['APPNAME_DATABASE_PASSWORD'] %>
 
development:
  <<: *default
  database: appname_development
...

This will make the Rails application run the database with the correct role and password. Save and exit by pressing CTRL+X, Y, then ENTER.

For more information on configuring databases in Rails, see the Rails documentation.

Now that you have made changes to config/database.yml, create your application’s databases by using the rails command:

rails db:create

Once Rails creates the database, you will receive the following output:

Output
Created database 'appname_development' 
Created database 'appname_test' 

As the output suggests, this command created a development and test database in your PostgreSQL server.

You now have a PostgreSQL database connected to your Rails app. To ensure that your application is working, the next step is to test your configuration.

Step 5 — Testing Your Configuration

To test that your application is able to use the PostgreSQL database, try to run your web application so that it will show up in a browser.

First, you’ll use the built-in web server for Rails, Puma, to serve your application. This web server comes with Rails automatically and requires no additional setup. To serve your application, run the following command:

rails server --binding=127.0.0.1

--binding binds your application to a specified IP. By default, this flag will bind Rails to 0.0.0.0, but since this means that Rails will listen to all interfaces, it is more secure to use 127.0.0.1 to specify the localhost. By default, the application listens on port 3000.

Once your Rails app is running, your command prompt will disappear, replaced by this output:

Output
=> Booting Puma
=> Rails 5.2.3 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.1 (ruby 2.6.3-p62), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://127.0.0.1:3000
Use Ctrl-C to stop 

To test if your application is running, open up a new terminal window on your server and use the curl command to send a request to 127.0.0.1:3000:

curl http://127.0.0.1:3000

You will receive a lot of output in HTML, ending in something like:

Output
...
        <strong>Rails version:</strong> 5.2.3<br />
        <strong>Ruby version:</strong> 2.6.3 (x86_64-darwin18)
      </p>
    </section>
  </div>
</body>
</html>

You can also access your Rails application in a local web browser by visiting:

http://127.0.0.1:3000

At this URL, you will find a Ruby on Rails welcome page:

This means that your application is properly configured and connected to the PostgreSQL database.

Conclusion

In this tutorial, you created a Ruby on Rails web application that was configured to use PostgreSQL as a database on a local macOS machine.

#postgresql #ruby-on-rails #ruby #macos #database

Emily Johnson

1599568900

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Shardul Bhatt

Shardul Bhatt

1626850869

7 Reasons to Trust Ruby on Rails

Ruby on Rails is an amazing web development framework. Known for its adaptability, it powers 3,903,258 sites internationally. Ruby on Rails development speeds up the interaction within web applications. It is productive to such an extent that a Ruby on Rails developer can develop an application 25% to 40% quicker when contrasted with different frameworks. 

Around 2.1% (21,034) of the best 1 million sites utilize Ruby on Rails. The framework is perfect for creating web applications in every industry. Regardless of whether it's medical services or vehicles, Rails carries a higher degree of dynamism to each application. 

Be that as it may, what makes the framework so mainstream? Some say that it is affordable, some say it is on the grounds that the Ruby on Rails improvement environment is simple and basic. There are numerous reasons that make it ideal for creating dynamic applications.

Read more: Best Ruby on Rails projects Examples

7 reasons Ruby on Rails is preferred

There are a few other well-known backend services for web applications like Django, Flask, Laravel, and that's only the tip of the iceberg. So for what reason should organizations pick Ruby on Rails application development? We believe the accompanying reasons will feature why different organizations trust the framework -

Quick prototyping 

Rails works on building MVPs in a couple of months. Organizations incline toward Ruby on Rails quick application development as it offers them more opportunity to showcase the elements. Regular development groups accomplish 25% to 40% higher efficiency when working with Rails. Joined with agile, Ruby on Rails empowers timely delivery.

Basic and simple 

Ruby on Rails is easy to arrange and work with. It is not difficult to learn also. Both of these things are conceivable as a result of Ruby. The programming language has one of the most straightforward sentence structures, which is like the English language. Ruby is a universally useful programming language, working on things for web applications. 

Cost-effective 

Probably the greatest advantage of Rails is that it is very reasonable. The system is open-source, which implies there is no licensing charge included. Aside from that, engineers are additionally effectively accessible, that too at a lower cost. There are a large number of Ruby on Rails engineers for hire at an average compensation of $107,381 each year. 

Startup-friendly

Ruby on Rails is regularly known as "the startup technology." It offers adaptable, fast, and dynamic web improvement to new companies. Most arising organizations and new businesses lean toward this as a direct result of its quick application improvement capacities. It prompts quicker MVP development, which permits new companies to rapidly search for venture investment. 

Adaptable framework 

Ruby on Rails is profoundly adaptable and versatile. In any event, when engineers miss adding any functions, they can utilize different modules to add highlights into the application. Aside from that, they can likewise reclassify components by eliminating or adding them during the development environment. Indeed, even individual projects can be extended and changed. 

Convention over configuration

Regardless of whether it's Ruby on Rails enterprise application development or ecommerce-centered applications, the system utilizes convention over configuration. Developers don't have to go through hours attempting to set up the Ruby on Rails improvement environment. The standard conventions cover everything, improving on things for engineers on the task. The framework likewise utilizes the standard of "Don't Repeat Yourself" to guarantee there are no redundancies. 

Versatile applications 

At the point when organizations scale, applications regularly slack. However, this isn't the situation with Ruby on Rails web application development. The system powers sites with high traffic, It can deal with a huge load of worker demands immediately. Adaptability empowers new businesses to keep utilizing the structure even after they prepare their first model for dispatch. 

Checkout Pros and Cons of Ruby on Rails for Web Development

Bottom Line 

Ruby on Rails is as yet a significant framework utilized by organizations all over the world - of every kind. In this day and age, it is probably the best framework to digitize endeavors through powerful web applications.

A software application development company provides comprehensive Ruby on Rails development to guarantee startups and MNCs can benefit as much as possible from their digital application needs. 

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