class ActiveStorage::Attached::One
Representation of a single attachment to a model.
Public Instance Methods
attach(attachable)
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Attaches an attachable
to the record.
If the record is persisted and unchanged, the attachment is saved to the database immediately. Otherwise, it’ll be saved to the DB when the record is next saved.
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/jpeg") person.avatar.attach(avatar_blob) # ActiveStorage::Blob object
# File lib/active_storage/attached/one.rb, line 56 def attach(attachable) if record.persisted? && !record.changed? record.public_send("#{name}=", attachable) record.save else record.public_send("#{name}=", attachable) end end
attached?()
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Returns true
if an attachment has been made.
class User < ApplicationRecord has_one_attached :avatar end User.new.avatar.attached? # => false
# File lib/active_storage/attached/one.rb, line 72 def attached? attachment.present? end
attachment()
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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.
# File lib/active_storage/attached/one.rb, line 31 def attachment change.present? ? change.attachment : record.public_send("#{name}_attachment") end
blank?()
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Returns true
if an attachment is not attached.
class User < ApplicationRecord has_one_attached :avatar end User.new.avatar.blank? # => true
# File lib/active_storage/attached/one.rb, line 42 def blank? !attached? end
detach()
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Deletes the attachment without purging it, leaving its blob in place.
# File lib/active_storage/attached/one.rb, line 23 delegate :detach, to: :detach_one
purge()
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Directly purges the attachment (i.e. destroys the blob and attachment and deletes the file on the service).
# File lib/active_storage/attached/one.rb, line 11 delegate :purge, to: :purge_one
purge_later()
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Purges the attachment through the queuing system.
# File lib/active_storage/attached/one.rb, line 17 delegate :purge_later, to: :purge_one
Private Instance Methods
detach_one()
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# File lib/active_storage/attached/one.rb, line 81 def detach_one Attached::Changes::DetachOne.new(name, record, attachment) end
purge_one()
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# File lib/active_storage/attached/one.rb, line 77 def purge_one Attached::Changes::PurgeOne.new(name, record, attachment) end