Module: Refile::Attachment

Included in:
Refile::ActiveRecord::Attachment
Defined in:
lib/refile/attachment.rb,
lib/refile/attachment/multiple_attachments.rb

Instance Method Summary collapse

Instance Method Details

#accepts_attachments_for(collection_name, collection_class:, accessor_prefix:, attachment: :file, append: false)

This method returns an undefined value.

Macro which generates accessors in pure Ruby classes for assigning multiple attachments at once. This is primarily useful together with multiple file uploads. There is also an Active Record version of this macro.

The name of the generated accessors will be the name of the association (represented by an attribute accessor) and the name of the attachment in the associated class. So if a Post accepts attachments for images, and the attachment in the Image class is named file, then the accessors will be named images_files.

Examples:

in associated class

class Document
  extend Refile::Attachment
  attr_accessor :file_id

  attachment :file

  def initialize(attributes = {})
    self.file = attributes[:file]
  end
end

in class

class Post
  extend Refile::Attachment
  include ActiveModel::Model

  attr_accessor :documents

  accepts_attachments_for :documents, accessor_prefix: 'documents_files', collection_class: Document

  def initialize(attributes = {})
    @documents = attributes[:documents] || []
  end
end

in form

<%= form_for @post do |form| %>
  <%= form.attachment_field :documents_files, multiple: true %>
<% end %>

Parameters:

  • collection_name (Symbol) —

    Name of the association

  • collection_class (Class) —

    Associated class

  • accessor_prefix (String) —

    Name of the generated accessors

  • attachment (Symbol) (defaults to: :file) —

    Name of the attachment in the associated class

  • append (Boolean) (defaults to: false) —

    If true, new files are appended instead of replacing the entire list of associated classes.


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# File 'lib/refile/attachment.rb', line 156

def accepts_attachments_for(collection_name, collection_class:, accessor_prefix:, attachment: :file, append: false)
  include MultipleAttachments.new(
    collection_name,
    collection_class: collection_class,
    name: accessor_prefix,
    attachment: attachment,
    append: append
  )
end

#attachment(name, cache: :cache, store: :store, raise_errors: true, type: nil, extension: nil, content_type: nil)

This method returns an undefined value.

Macro which generates accessors for the given column which make it possible to upload and retrieve previously uploaded files through the generated accessors.

The raise_errors option controls whether assigning an invalid file should immediately raise an error, or save the error and defer handling it until later.

Given a record with an attachment named image, the following methods will be added:

  • image
  • image=
  • remove_image
  • remove_image=
  • remote_image_url
  • remote_image_url=
  • image_url
  • image_presigned_url

Examples:

class User
  extend Refile::Attachment

  attachment :image
  attr_accessor :image_id
end

Parameters:

  • name (String) —

    Name of the column which accessor are generated for

  • cache (#to_s) (defaults to: :cache) —

    Name of a backend in Refile.backends to use as transient cache

  • store (#to_s) (defaults to: :store) —

    Name of a backend in Refile.backends to use as permanent store

  • raise_errors (true, false) (defaults to: true) —

    Whether to raise errors in case an invalid file is assigned

  • type (Symbol, nil) (defaults to: nil) —

    The type of file that can be uploaded, see Refile.types

  • extension (String, Array<String>, nil) (defaults to: nil) —

    Limit the uploaded file to the given extension or list of extensions

  • content_type (String, Array<String>, nil) (defaults to: nil) —

    Limit the uploaded file to the given content type or list of content types


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# File 'lib/refile/attachment.rb', line 39

def attachment(name, cache: :cache, store: :store, raise_errors: true, type: nil, extension: nil, content_type: nil)
  definition = AttachmentDefinition.new(name,
    cache: cache,
    store: store,
    raise_errors: raise_errors,
    type: type,
    extension: extension,
    content_type: content_type
  )

  define_singleton_method :"#{name}_attachment_definition" do
    definition
  end

  mod = Module.new do
    attacher = :"#{name}_attacher"

    define_method :"#{name}_attachment_definition" do
      definition
    end

    define_method attacher do
      ivar = :"@#{attacher}"
      instance_variable_get(ivar) or instance_variable_set(ivar, Attacher.new(definition, self))
    end

    define_method "#{name}=" do |value|
      send(attacher).set(value)
    end

    define_method name do
      send(attacher).get
    end

    define_method "remove_#{name}=" do |remove|
      send(attacher).remove = remove
    end

    define_method "remove_#{name}" do
      send(attacher).remove
    end

    define_method "remote_#{name}_url=" do |url|
      send(attacher).download(url)
    end

    define_method "remote_#{name}_url" do
    end

    define_method "#{name}_url" do |*args|
      Refile.attachment_url(self, name, *args)
    end

    define_method "presigned_#{name}_url" do |expires_in = 900|
      attachment = send(attacher)
      attachment.store.object(attachment.id).presigned_url(:get, expires_in: expires_in) unless attachment.id.nil?
    end

    define_method "#{name}_data" do
      send(attacher).data
    end

    define_singleton_method("to_s")    { "Refile::Attachment(#{name})" }
    define_singleton_method("inspect") { "Refile::Attachment(#{name})" }
  end

  include mod
end