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Has Placeholder Image is a Ruby on Rails gem that allows developers to generate placeholder images for models depending on the title or name attributes of model.
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 Project Readme

HasPlaceholderImage

Test Maintainability Test Coverage Gem Version

Has Placeholder Image is a Ruby on Rails plugin that allows developers to generate placeholder images for models that has ActiveStorage fields.

Installation

Add this line to your application's Gemfile:

gem 'has_placeholder_image'

And then execute:

$ bundle

Or install it yourself as:

$ gem install has_placeholder_image

after generate configuration file with this command;

rails g has_placeholder_image:install

Usage

Insert this method to your model which will have placeholder images:

has_placeholder_image

You can customize default configuration with config/initializers/has_placeholder_image.rb or you can customize placeholder image generation on model basis by adding custom attributes to placeholder callback.

For example;

has_placeholder_image source: :title, 
                      target: :logo, 
                      background_color: '#335eea'

Configuration

The default configuration lies in config/initializers/has_placeholder_image.rb and can be customized according to your liking.

HasPlaceholderImage.setup do |config|
  config.background_color = '#000000'
  config.font_color = '#FFFFFF'
  config.font_size = 200
  config.transformer = 'two_word_first_letter_upcase'
  config.source = 'name'
  config.target = 'photo'
  config.output_path = 'tmp/placeholders'
  config.height = 300
  config.width = 300
end
Key Description
background_color For image background color.
font_color For text color.
font_size For font size.
transformer How to generate your image title. This time only have 'two_word_first_letter_upcase' method.
source Placeholder image text generate with this field.
target Your active storage attribute on your model.
output_path Where to store generated images path.
height Generated image height.
width Generated image width.

Example

app/models/company.rb

# frozen_string_literal: true

class Company < ApplicationRecord
  has_one_attached :logo
  has_placeholder_image source: :title, target: :logo,
                        background_color: '#335eea',
			            font_size: 200

  validates :title, presence: true
end

Output

Contributing

See the contributing guide.

License

The gem is available as open source under the terms of the MIT License.