overlaps?

Adjacency

Just for completeness (it should behave like this), comparing ranges that start and end with the same value will overlap, e.g.

(1..5).overlaps?(5..10) # => true

Take care with time ranges

Trying this in the console:

(1.day.from_now..5.days.from_now).overlaps?(5.days.from_now..10.days.from_now)

will blow up…

It’s fine with Dates though:

(1.day.from_now.to_date..5.days.from_now.to_date).overlaps?(5.days.from_now.to_date..10.days.from_now.to_date) # => true

If you need to check for overlaps in Times, use the validates_overlap gem.

github.com/robinbortlik/validates_overlap

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/