Module: DataMapper::Has::Versions::InstanceMethods

Defined in:
lib/dm-has-versions/has/versions.rb

Instance Method Summary collapse

Instance Method Details

#latest? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dm-has-versions/has/versions.rb', line 93

def latest?
  version == versions.size
end

#pending_version_attributes ⇒ Hash

Returns a hash of original values to be stored in the versions table when a new version is created. It is cleared after a version model is created.

–

Returns:

  • (Hash) 


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# File 'lib/dm-has-versions/has/versions.rb', line 76

def pending_version_attributes
  @pending_version_attributes ||= {}
end

#revert ⇒ Object 



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# File 'lib/dm-has-versions/has/versions.rb', line 128

def revert
  revert_to(version) or raise RevertError
end

#revert_to(version) ⇒ Object 



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# File 'lib/dm-has-versions/has/versions.rb', line 121

def revert_to(version)
  transaction{revert_to!(version)}
  true
rescue RevertError
  false
end

#revert_to!(version) ⇒ Object

Raises:



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# File 'lib/dm-has-versions/has/versions.rb', line 113

def revert_to!(version)
  self.version = version
  pending_version_attributes.clear
  raise RevertError unless save
  target_id = versions[version].id
  versions.all(:id.gte => target_id).destroy!
end

#version ⇒ Object 



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# File 'lib/dm-has-versions/has/versions.rb', line 97

def version
  @version ||= versions.size
end

#version=(version) ⇒ Object 



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# File 'lib/dm-has-versions/has/versions.rb', line 101

def version=(version)
  if target = versions.first(:offset => version)
    self.properties.each do |property|
      next if property.key?
      name = property.name
      self.attribute_set(name, target.attribute_get(name))
    end
    @version = version
  end
  !!target
end

#versions ⇒ Collection

Returns a collection of other versions of this resource. The versions are related on the models keys, and ordered by the version field.

–

Returns:

  • (Collection) 


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# File 'lib/dm-has-versions/has/versions.rb', line 87

def versions
  version = self.class.const_get("Version")
  original_key = "#{self.class.storage_name.singular}_id".intern
  version.all(original_key => self.id, :order => [:id.asc])
end