Module: TaliaCore::DataTypes::TempFileHandling

Included in:
FileRecord
Defined in:
lib/talia_core/data_types/temp_file_handling.rb

Overview

Module for the handling of temporary files in data storage objects

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#copy_to_temp_file(file) ⇒ Object

Copies the given file to a randomly named Tempfile.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 69

def copy_to_temp_file(file)
  self.class.copy_to_temp_file file, random_tempfile_filename
end

#random_tempfile_filename ⇒ Object

Generates a unique filename for a Tempfile.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 79

def random_tempfile_filename
  "#{rand Time.now.to_i}#{location || 'attachment'}"
end

#temp_data ⇒ Object

Gets the data from the latest temp file. This will read the file into memory.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 59

def temp_data
  save_attachment? ? File.read(temp_path) : nil
end

#temp_data=(data) ⇒ Object

Writes the given data to a Tempfile and adds it to the collection of temp files.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 64

def temp_data=(data)
  self.temp_path = write_to_temp_file data unless data.nil?
end

#temp_path ⇒ Object

Gets the latest temp path from the collection of temp paths. While working with an attachment, multiple Tempfile objects may be created for various processing purposes (resizing, for example). An array of all the tempfile objects is stored so that the Tempfile instance is held on to until it’s not needed anymore. The collection is cleared after saving the attachment.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 40

def temp_path
  p = temp_paths.first
  p.respond_to?(:path) ? p.path : p.to_s
end

#temp_path=(value) ⇒ Object

Adds a new temp_path to the array. This should take a string or a Tempfile. This class makes no attempt to remove the files, so Tempfiles should be used. Tempfiles remove themselves when they go out of scope. You can also use string paths for temporary files, such as those used for uploaded files in a web server.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 53

def temp_path=(value)
  temp_paths.unshift value
  temp_path
end

#temp_paths ⇒ Object

Gets an array of the currently used temp paths. Defaults to a copy of #full_filename.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 46

def temp_paths
  @temp_paths ||= (new_record? || !File.exist?(full_filename)) ? [] : [copy_to_temp_file(full_filename)]
end

#write_to_temp_file(data) ⇒ Object

Writes the given file to a randomly named Tempfile.



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# File 'lib/talia_core/data_types/temp_file_handling.rb', line 74

def write_to_temp_file(data)
  self.class.write_to_temp_file data, self.location
end