Paperclip::Validate::ClassMethods

Places ActiveRecord-style validations on the content type of the file assigned. The possible options are:

• content_type: Allowed content types. Can be a single content type or an array. Allows all by default.

• message: The message to display when the uploaded file has an invalid content type.

# File lib/dm-paperclip/validations.rb, line 30
def validates_attachment_content_type(*fields)
  validators.add ContentTypeValidator, *fields
end

Places ActiveRecord-style validations on the presence of a file.

# File lib/dm-paperclip/validations.rb, line 22
def validates_attachment_presence(*fields)
  validators.add RequiredFieldValidator, *fields
end

Places ActiveRecord-style validations on the size of the file assigned. The possible options are:

• in: a Range of bytes (i.e. 1..1.megabyte),

• less_than: equivalent to :in => 0..options

• greater_than: equivalent to :in => options..Infinity

• message: error message to display, use :min and :max as replacements

# File lib/dm-paperclip/validations.rb, line 12
def validates_attachment_size(*fields)
  validators.add SizeValidator, *fields
end

Adds errors if thumbnail creation fails. The same as specifying :whiny_thumbnails => true.

# File lib/dm-paperclip/validations.rb, line 17
def validates_attachment_thumbnails name, options = {}
  self.attachment_definitions[name][:whiny_thumbnails] = true
end