Module: DynamicImage::BelongsTo::ClassMethods

Defined in:
lib/dynamic_image/belongs_to.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to_image(name, scope = nil) ⇒ void

This method returns an undefined value.

Declares an association to an image. Behaves like belongs_to and takes the same arguments, with one addition: assigning anything that isn't a Model builds the associated record from it, treating it as an uploaded file. A file can therefore be posted straight to the parent model.

The image is built, not saved, and is written when the parent is. Add validates_associated if an invalid upload should invalidate the parent; without it the assignment is silently dropped on save.

Examples:

class User < ActiveRecord::Base
  belongs_to_image :avatar, class_name: "Image"
  validates_associated :avatar
end

User.create(avatar: params[:file])



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# File 'lib/dynamic_image/belongs_to.rb', line 32

def belongs_to_image(name, scope = nil, **)
  belongs_to(name, scope, **)

  define_method "#{name}=" do |new_image|
    if new_image.present? && !new_image.is_a?(DynamicImage::Model)
      new_image = send("build_#{name}", file: new_image)
    end
    super(new_image)
  end
end