Integrating CarrierWave in my Rails Application

rails -v
gem install rails 6.0.3.4

Setting Up CarrierWave

*config/initializers/carrier_wave.rb*require 'carrierwave/orm/activerecord'
rails generate uploader Image
*app/uploaders/image_uploader.rb*# encoding: utf-8class ImageUploader < CarrierWave::Uploader::Base# Include RMagick or MiniMagick support:
# include CarrierWave::RMagick
# include CarrierWave::MiniMagick
# Choose what kind of storage to use for this uploader:
storage :file
# storage :fog
# Override the directory where uploaded files will be stored.
# This is a sensible default for uploaders that are meant to be mounted:
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
# Provide a default URL as a default if there hasn't been a file uploaded:
# def default_url
# # For Rails 3.1+ asset pipeline compatibility:
# # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
#
# "/images/fallback/" + [version_name, "default.png"].compact.join('_')
# end
# Process files as they are uploaded:
# process :scale => [200, 300]
#
# def scale(width, height)
# # do something
# end
# Create different versions of your uploaded files:
# version :thumb do
# process :resize_to_fit => [50, 50]
# end
# Add a white list of extensions which are allowed to be uploaded.
# For images you might use something like this:
# def extension_white_list
# %w(jpg jpeg gif png)
# end
# Override the filename of the uploaded files:
# Avoid using model.id or version_name here, see uploader/store.rb for details.
# def filename
# "something.jpg" if original_filename
# end
end
...
include CarrierWave::MiniMagick
...
...
version :thumb do
process :resize_to_fill => [50, 50]
end
...
...
def extension_white_list
%w(jpg jpeg gif png)
end
...
*app/model/image.rb*
mount_uploader :image, ImageUploader

Validating Image Size

*app/model/image.rb
validates_processing_of :image
validate :image_size_validation
private
def image_size_validation
errors[:image] << "should be less than 500KB" if image.size >
0.5.megabytes

--

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Saman Batool

Saman Batool

just a junior developer navigating through problems in Rails and React. I like sharing my solutions, thinking processes and sometimes frustration..