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January 17, 2019 - (v4.2.7)
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This method has been completely removed from Rails 5 onwards

Completely removed from Rails from 5 onwards. See issue: github.com/rails/rails/issues/18336

Just remove from your codebase, or protect with `private` keyword

June 4, 2018 - (v4.2.7)
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Upload Files Directly To S3 Using Paperclip And Dropzone.js

Upload Files Directly To S3 Using Paperclip And Dropzone.js

by | Dec 22, 2017 | Technical Articles | 0 comments

It’s usually the small time-consuming tasks that frustrate us the most. Such as uploading a file to S3; the requirement is pretty simple but the method chosen to upload the file will decide the efficiency of the task. As uploading files is a feature that most applications require, RailsCarma has compiled a brief tutorial on one of the best methods of getting this task done efficiently: using Paperclip and Dropzone.js.

Paperclip is a popular choice for uploading images and files as it offers great features to handle the attachments;paperclip’ gem is the go-to option. Paperclip allows you to upload multiple images and files, generate thumbnails and even automatically resize the images. It boasts of a large and active community making it the top choice of most developers.
Dropzone.js is an open source library with file drag & drop (with image preview) features.
Amazon S3 is a simple storage device for data storage. We can use it to retrieve images and all type of files.

Why Paperclip?

Paperclip is a popular file uploading tool for the following reasons:

Supports File Caching:
If a form fails to validate, we don’t want the user to pick his file again and re-upload it. Therefore, file caching is necessary from a UX standpoint. And it also conserves the bandwidth.

Processes Images
Paperclip is able to resize and crop images to several different formats thus allowing the developer to choose the library.

Simplifies The Task!
Paperclip gem does not pollute your code and is easy to test!

Allows File Processing
Paperclip allows file processing for EXIF data extraction and thumbnail creation of uploaded PDFs, PSDs, DOCs, XLSXs.

Provides CDN & Storage-Service Support 
This is a big plus as we want to keep the bandwidth to our servers as low as possible and avoid possible data loss due to server failure.

Offers On-The-Fly Processing
Paperclip processes images and files on a per-request basis. This is an innovative feature that enables developers to create custom content that adapts best to different situations.

What Are The Dropzone Asynchronous Events?

addedfile:  When a file is added to the list.
removedfile: Used whenever a file is removed from the list. You can listen to this and delete the file from your server if you want to.
thumbnail: When the thumbnail has been generated. It receives the data URL as second parameter.
error: An error occurred receives the error message as the second parameter. And if the error was due to xmlhttprequest, the xhr object is received as the third parameter.
processing: When a file is processed (since there is a queue, not all files are processed immediately). This event was previously called processingfile.
drop: The user dropped something onto the drop zone.

How Can We Configure Paperclip In Our Application?

has_attached _file: asset
:storage => :s3
:S3_host_name => ENV[“S3_HOST_NAME”]
:S3_region => ENV[“S3_REGION”]
:S3_protocol => ENV[“S3_PROTOCOL”]
:path =>:account_id/:class/:source_id/:attachment/:file_name”,:s3_headers => {‘ContentDisposition’ =>attachment’,content-type’ =>‘application/octet_stream’},
:bucket => ENV[“S3_BUCKET”],
:s3_credentials => Proc.new{|a| a.instance.s3_credentials}
Do_not_validate_attachment_file_type :asset
def s3_credentials
{:access_key_id => ENV[“S3_ACCESS_KEY_ID”], :secret_access_key => ENV[“S3_SECRET_ACCESS_KEY”]}

end 

How Can We Handle Custom Paths In Our Application? Read More from here http://www.railscarma.com/blog/technical-articles/upload-files-directly-s3-using-paperclip-dropzone-js/

May 3, 2018
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April 17, 2018
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When using ActionView::Base.new to render templates views

when calling this method to render templates to a string. in order to use any helper methods you need to add them to the view like this

view = ActionView::Base.new(ActionController::Base.view_paths, {})
view.class_eval do  
  # include any needed helpers (for the view)
  include ApplicationHelper
end 

source: http://peden.biz/rendering-a-rails-view-from-a-script/

March 22, 2018
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Each attribute has a `reset_<attribute>!` method on it as well.

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method is working until rails 4

deprecation message and rails line (till v 2.3.8) is not correct. Method exist and working until rails 4.

January 29, 2018 - (<= v3.2.13)
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Correction: Getting just the ordinal on Rails 3.

The ordinal method isn’t publicly available in Rails 3 so you can do something like this:

ordinalize(1).last(2) #=> "st"

ordinalize(20).last(2) #=> "th"
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Effectively identical to Hash#as_json

As of 5.2.0.beta, there is no ActiveRecord::Relation specific implementation. This will result in Object#as_json , which will convert the relation to a hash and call Hash#as_json .

class Object
  def as_json(options = nil) #:nodoc:
    if respond_to?(:to_hash)
      to_hash.as_json(options)
    else
      instance_values.as_json(options)
    end
  end
end
December 20, 2017
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Counting with select

If you try to write

Model.select('field_one', 'field_two AS something').count

it will fail (at least for Rails 5.0) with the message PG::SyntaxError: ERROR: syntax error at or near “AS”. In order to fix that issue, you should write

Model.select('field_one', 'field_two AS something').count(:all)
December 9, 2017 - (<= v3.2.13)
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Getting just the ordinal on Rails 3.

The ordinal method isn’t publicly available in Rails 3 so you can do something like this:

ordinal(1).last(2) #=> "st"

ordinal(20).last(2) #=> "th"
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