RoR Guide & Solutions: 2017

Wednesday, November 1, 2017

Image upload using paperclip gem in rails5

Image uploading is an important feature in web application. Here are few steps to enable image uploading function using “Paperclip gem”:

Step-1:

Paperclip requires the installation of ImageMagick on your Mac machine:

brew install imagemagick

Step-2:

Open gemfile and add gem:

gem 'paperclip'

then run bundle install

Step-3:

After adding gem add the image column in your table, here users table. Run

command:

rails generate migration add_image_to_users

This will create new migration in db/migrate then run migration

Step-4:

We also need to add validation for your image attribute. Add following code in your model 'user.rb'

has_attached_file :img, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"

validates_attachment_content_type :img, content_type: /\Aimage\/.*\z/

Step-5:

After that you need to edit in your users new form and edit form with following HTML code

app/views/users/new.html.erb

app/views/users/edit.html.erb

<%= f.file_field :image %>

</div>

Step-6:

After submitting the form if you want to show the image you need to add following code to the app/views/users/show.html.erb

<p>

<strong>Image:</strong>

<%= image_tag @user.image %>

</p>

Wednesday, March 1, 2017

Sending email in Rails5 using Mailtrap

Email Functionality:-

In our rails application we want to create email functionality so that rails application will send an email to the user when a new user is created.

Following step will show how to send email through ActionMailer, ActionMailer Preview and third party email provider.

Step-1 :-

In your rails app on terminal start with following command.

$ rails g mailer example_mailer

this will create mailer folder in our application.

Step-2 :-

Then go for the following path

app/mailers/example_mailer.rb

Add following code

class ExampleMailer < ActionMailer::Base

default from: "from@example.com"

end

It will set a sender’s email address by default

Step-3 :-

Create a sample_email method it will take the parameter and send email to email address of user.

class ExampleMailer < ActionMailer::Base

default from: "from@example.com"

def sample_email(user)

@user = user mail(to: @user.email, subject: 'Sample Email')

end

Step-4 :-

Now we will write a mail we want to send to our user and this can be done by adding sample_email.html.erb file in views

so create sample_email.html.erb to app/views/example_mailer/sample_email.html.erb

and write following code.

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<p> Sample mail sent using smtp. </p>

</body>

</html>

Step-5:-

We also need create text part for this email.

So create sample_email.text.erb in your app/views/example_mailer and add following code:

Hi <%= @user.name %>

Sample mail sent using smtp.

Step-6:-

By default rails tries to send emails via SMTP. We will provide SMTP configuration in environment settings/config/environments/production.rb. Add following code using your any mailtrap address

config.action_mailer.smtp_settings = {

:user_name => ‘<username>,

:password => '<pwd>',

:address => 'smtp.mailtrap.io',

:domain => 'smtp.mailtrap.io',

:port => '2525',

:authentication => :cram_md5

}

Step-7 :-

Now edit the UsersController to trigger the event that will send an email to a user.

We just need to add “ExampleMailer.sample_email(@user).deliver”

line to the create method in app/controllers/users_controller.rb.

def create

@user = User.new(user_params)

respond_to do |format|

if @user.save

ExampleMailer.sample_email(@user).deliver

format.html { redirect_to @user, notice: 'User was successfully created.' }

format.json { render :show, status: :created, location: @user }

else

format.html { render :new }

format.json { render json: @user.errors, status: :unprocessable_entity }

end

After doing all this step restart your server and create any new user. User will receive welcome mail in mail account.

RoR Guide & Solutions

Wednesday, November 1, 2017

Image upload using paperclip gem in rails5

Wednesday, March 1, 2017

Sending email in Rails5 using Mailtrap

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