Install and Use Redis Server

Sort Introduction

Redis is an extremely fast, atomic key-value store. It allows the storage of strings, sets, sorted sets, lists and hashes. Redis keeps all the data in RAM, much like Memcached but unlike Memcached, Redis periodically writes to disk, giving it persistence. It is quite useful as both a cache store and as a full-fledged, NoSQL data store.

This blog describes getting Redis working on your rails application.

Initial setup

  1. Start off by updating all of the apt-get packages:
    $ sudo apt-get update
  2. Now Download a compiler with build essential which will help us install Redis from source:
    $ sudo apt-get install build-essential
  3. Now in the last we need to download tcl:
    $ sudo apt-get install tcl8.5

Redis Installation

Thats all… Finish Now try to run the redis server into your machine

$ redis-serverredis

Stop redis server running in background :

  • $ killall redis-server

OR

  • sidekiqctl

If you are, looking to Develop and design for your project then feel free to contact us at any time

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Deploy Ruby on Rails project with Passenger and Nginx

I’m assuming that you have installed ruby and rails at your server and have a Ruby on rails project to deploy with Passenger and Nginx

Step 1 –  First of all, we need to add a Sudo User to our system so user can have privilege to access the files.

create a user if not exists, in this example, I will explain to create a root user

tecorb@tecorb-Lenovo-B40-80:~$  adduser root

(this will ask few questions like your password etc.)

Step 2 – Now we have to add this new user to the sudo group

Syntex:

tecorb@tecorb-Lenovo-B40-80:~$ gpasswd -a root sudo

Step 3 – Now we need to install Passenger and Nginx

First of all we will install a PGP (Pretty Good Privacy) key:

tecorb@tecorb-Lenovo-B40-80:~$  sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 561F9B9CAC40B2F7

Now we have to create an APT (Advanced Packaging Tool) source file

tecorb@tecorb-Lenovo-B40-80:~$  sudo vim /etc/apt/sources.list.d/passenger.list

And insert the following line in the file:

deb https://oss-binaries.phusionpassenger.com/apt/passenger trusty main

Press ESC then :wq and hit enter, Now our file has been saved through vi editor

Now we need to change the owner and permissions for this passenger.list file:

tecorb@tecorb-Lenovo-B40-80:~$  sudo chown root: /etc/apt/sources.list.d/passenger.list

tecorb@tecorb-Lenovo-B40-80:~$  sudo chmod 600 /etc/apt/sources.list.d/passenger.list

Now we have to update our APT cache:

tecorb@tecorb-Lenovo-B40-80:~$   sudo apt-get update

And finally, we will install Passenger with Nginx:

tecorb@tecorb-Lenovo-B40-80:~$  sudo apt-get install nginx-extras passenger

Step 4- In this step we will open the Nginx configuration file for some changes:

tecorb@tecorb-Lenovo-B40-80:~$  sudo vim /etc/nginx/nginx.conf

now file will be open in vi editer, Uncomment given line, These lines will look like this:

# passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini;

# passenger_ruby /usr/bin/ruby;

uncomment these lines and update the path mentioned in the passenger_ruby line and add default user :

passenger_default_user root;

passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini;

passenger_ruby /usr/local/rvm/gems/ruby-2.3.0/wrappers/ruby;

Note if you are unable to get what is your path to ruby then follow these steps:

tecorb@tecorb-Lenovo-B40-80:~$   which passenger-config

this will return a path like: /usr/bin/passenger-config

If you are on RVM and use Ruby 2.2.1 (version can be whatever you are using)

tecorb@tecorb-Lenovo-B40-80:~$  rvm use 2.3.0

Now finally, we will invoke passenger-config with its full path, passing –ruby-command as parameter like:

tecorb@tecorb-Lenovo-B40-80:~$  /usr/bin/passenger-config –ruby-command

This will show you something like:

  To use in Apache: PassengerRuby /usr/local/rvm/wrappers/ruby-1.8.7-p358/ruby

  To use in Nginx : passenger_ruby /usr/local/rvm/wrappers/ruby-1.8.7-p358/ruby

  To use with Standalone: /usr/local/rvm/wrappers/ruby-1.8.7-p358/ruby /opt/passenger/bin/passenger start

From here you will get path for your passenger_ruby (Nginx). This path will use at passenger_ruby in nginx.conf

Now finally we will save our file and exit by Press ESC then type :wq and hit enter.

Step 5- Now we have almost done, we need to disable the default Nginx configuration at Nginx config file:

tecorb@tecorb-Lenovo-B40-80:~$  sudo vim /etc/nginx/sites-available/default

Findout these lines and comment them:

# listen 80 default_server;

# listen [::]:80 default_server ipv6only=on;

Save this config file, Press ESC then type :wq and hit enter.

Step 6- Now we will create an Nginx configuration file for our application (like our app name is tecorbapp):

tecorb@tecorb-Lenovo-B40-80:~$  sudo vim /etc/nginx/sites-available/tecorbapp

Add the following server block into this file:

server {

  listen 80 default_server;

  server_name tecorbdomain.com http://www.tecorbdomain.com;

  passenger_enabled on;

  passenger_app_env development;

  root /home/rails/tecorbapp/public;

}

In this file we enable listening on port 80, set our domain, enable Passenger, set the application environment here we have used development environment and set the root to the public directory of our ruby on rails project.

If you don’t want to add your domain to the application, you can skip the server_name line from this file, or if you want to use any IP address you can replace

tecorbdomain.com http://www.tecorbdomain.com with your ip address.

Now we will save this config file, Press ESC then type :wq and hit enter.

Step 7- Now finally we will create a symlink this file:

tecorb@tecorb-Lenovo-B40-80:~$   sudo ln -s /etc/nginx/sites-available/tecorbapp /etc/nginx/sites-enabled/tecorbapp

and Restart our Nginx:

tecorb@tecorb-Lenovo-B40-80:~$  sudo nginx -s reload

Now our application should be accessible from our domain, go to your browser and hit the domain.

Also Read- AngularJs with Ruby on Rails Task-1

If you are, looking to Develop and design for your project then feel free to contact us at any time

  • Call Us- +91 9910781148, +1 8033353593
  • Email: company@tecorb.com
  • Skype- tecorb

“We maintain transparency with our customers. Our values and business ethics has given us repeated customers. We tend are proud to be a reliable outsourcing partner for many clients across the World.”

AngularJs with Ruby on Rails Task-3

In Part-2 we have worked with the controller and model in angularJs with Ruby on Rails  and submitted the book form, add that book into the list.

Today we will discuss how to save and get and save data  from/to  the database model using API in ruby on rails with the help of AngularJs.

Lets proceed further :

Step 1: First of all we have to create a Book model in rails with name attribute. And migrate the migration.

Step 2. Now create a  books controller in rails that will contain two actions first for index (to  make an api to get all books records from the db) and another for create( to save data in Book Model). And generate the routes for both of these.

  • Assuming that you are generating the routes using resources :books  in route.rb
  • So for index action path will be ‘books/’ with GET type and for create action path will be same ‘books/’ with POST type.

 Step 3: Now we have to create the JSON Apis for index and create in our books controller like so we can call them from angularJs Controller

rsz_book8

Step 4: Now from AngularJS controller that we have defined in welcome.js we have to call these apis to fetch the book records and save the book into the database.

rsz_1book9

Now We have all done. Refresh your page add book from text-box that will save into your database and all blow listing will be fetch from database. Have fun with AngularJS

rsz_book6

Also Read- AngularJs with Ruby on Rails Task-II

If you are, looking to Develop and design for your project then feel free to contact us at any time

Call Us- +91 9910781148, +1 8033353593
Email: company@tecorb.com
Skype- tecorb
“We maintain transparency with our customers. Our values and business ethics has given us repeated customers. We tend are proud to be a reliable outsourcing partner for many clients across the World.”

AngularJs with Ruby on Rails Task-II

In Part-I we have done how to use basic AngularJs in our Ruby on Rails Project.

Now today we will work with the controller and model in angularJs and submit that book form and add that book into the list.Lets proceed further:

Step 1: Now we will define a controller into our view (index.html.erb) using a div using ‘ng-controller’ like:

rsz_book3

Step 2: Now we will define the controller in the welcome.js fil

rsz_book4

Here ‘myapp’ is same as we have defined in application.html.erb within ‘ng-app’ and ‘welcomeCtrl’ is same which we have defined in view index.html.erb.

$scope is an object by which we will use to interact with the view, we can get and set variables and functions on it.

Here we have set a books array with hashes as the elements.

Step 3: Now first of all we have to access this books array on our view and show a list of books . So come to the index.html.erb and add a list like:

rsz_2book5

Here ‘ng-repeat’ will works like as loop and return every book one by one that are available in books array.

rsz_book6

Step 4: Now we have to submit this form and add the value to the list shown below.

For this we have to add  ng-submit=”addEntry()” in our form tag. Basically ‘ng-submit’ will call the ‘addEntry()’ method when this form will submit. Like,

<form ng-submit=”addEntry()”>

Step 5: Now we have to define this ‘addEntry()’ method in our Angular controller that we have defined in welcome.js file

rsz_1book7

Here $scope.books.push($scope.newEntry) will push the newEntry object in books array. ‘newEntry’ is that object which will use to access the form fields as we have described in Part-I blog.

And after pushing the newEntry data into books array we have to reset the fields so we will initialize ‘newEntry’ with null {}

Now All Done, refresh and add some book.

Also Read- AngularJs with Ruby on Rails Task-1

If you are, looking to Develop and design for your project then feel free to contact us at any time

Call Us- +91 9910781148, +1 8033353593
Email: company@tecorb.com
Skype- tecorb
“We maintain transparency with our customers. Our values and business ethics has given us repeated customers. We tend are proud to be a reliable outsourcing partner for many clients across the World.”

AngularJs with Ruby on Rails Task-I

As we know that Ruby and Rails is a great for  building the backend (Server) Apis. AngularJs is great for building the client side JavaScript Applications. So by combining both of these together for building the applications then surly they will deliver a  great products. So I think AngularJs is a great tool for building the application with Ruby on Rails.

Lets proceed for using AngularJs in our Rails Application:

Step 1: Create a rails application like lets say ‘angulardemo’

Step 2: Add gem “angularjs-rails” to your gem file and do bundle.

Step 3: Now bind the ng-app=”myapp” with html tag in application.html.erb like:

<html ng-app=”myapp”>

And in application.js  just add

 //= require angular

The ng-app directive defines that this is an AngularJS application

 Step 4:  Make a controller with index action and set this as root in route.rb

 Step 5: Now we are going to make a simple form that will take a book name from user and add this name in the books list shown below.

rsz_book

So for this first of all we have to put a html form with name attribute that will be the book name.

Step 6: Now add  ng-model=”newEntry.name” with this text box like:

<input type=”text” name=”name” placeholder=”Type a name here” ng-model=”newEntry.name” autocomplete=”off”>

Here ‘ng-model’ binds the value of HTML controls like select,input etc to application data.

And ‘newEntry’ is the object that will working with in this form and name being an attribute that will set on this object for this given field.

Step 7: Now put {{newEntry.name}}  below the form

this will print the model value when you will type in the textbox now. So refresh your page and try to write in your text field and look you will notice same text will appear below the form what you are typing now.

rsz_book2

So in this Part we have learn how to use AngularJs in our Rails Application.

In Next part we will discuss the working with controller and submit this form and add this name to a list.

Also Read- Few steps for choosing Enterprise Mobile and Web Application Development Company

If you are, looking to Develop and design for your project then feel free to contact us at any time

  • Call Us- +91 9910781148, +1 8033353593
  • Email: company@tecorb.com
  • Skype- tecorb

“We maintain transparency with our customers . Our values and business ethics has given us repeated customers. We tend are proud to be a reliable outsourcing partner for many clients across the World.”