Class: ActiveStorage::Attached::One

Inherits:
ActiveStorage::Attached show all
Defined in:
lib/active_storage/attached/one.rb

Overview

Representation of a single attachment to a model.

Instance Attribute Summary

Attributes inherited from ActiveStorage::Attached

#dependent, #name, #record

Instance Method Summary collapse

Methods inherited from ActiveStorage::Attached

#initialize

Constructor Details

This class inherits a constructor from ActiveStorage::Attached

Instance Method Details

#attach(attachable) ⇒ Object

Associates a given attachment with the current record, saving it to the database.

person.avatar.attach(params[:avatar]) # ActionDispatch::Http::UploadedFile object
person.avatar.attach(params[:signed_blob_id]) # Signed reference to blob from direct upload
person.avatar.attach(io: File.open("/path/to/face.jpg"), filename: "face.jpg", content_type: "image/jpg")
person.avatar.attach(avatar_blob) # ActiveStorage::Blob object



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# File 'lib/active_storage/attached/one.rb', line 22

def attach(attachable)
  blob_was = blob if attached?
  blob = create_blob_from(attachable)

  unless blob == blob_was
    transaction do
      detach
      write_attachment build_attachment(blob: blob)
    end

    blob_was.purge_later if blob_was && dependent == :purge_later
  end
end

#attached? ⇒ Boolean

Returns true if an attachment has been made.

class User < ActiveRecord::Base
  has_one_attached :avatar
end

User.new.avatar.attached? # => false

Returns:

  • (Boolean) 


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# File 'lib/active_storage/attached/one.rb', line 43

def attached?
  attachment.present?
end

#attachment ⇒ Object

Returns the associated attachment record.

You don't have to call this method to access the attachment's methods as they are all available at the model level.



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# File 'lib/active_storage/attached/one.rb', line 12

def attachment
  record.public_send("#{name}_attachment")
end

#detach ⇒ Object

Deletes the attachment without purging it, leaving its blob in place.



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# File 'lib/active_storage/attached/one.rb', line 48

def detach
  if attached?
    attachment.destroy
    write_attachment nil
  end
end

#purge ⇒ Object

Directly purges the attachment (i.e. destroys the blob and attachment and deletes the file on the service).



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# File 'lib/active_storage/attached/one.rb', line 57

def purge
  if attached?
    attachment.purge
    write_attachment nil
  end
end

#purge_later ⇒ Object

Purges the attachment through the queuing system.



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# File 'lib/active_storage/attached/one.rb', line 65

def purge_later
  if attached?
    attachment.purge_later
  end
end