Class: Copyable::Declarations::Columns

Inherits:
Declaration show all
Defined in:
lib/copyable/declarations/columns.rb

Class Method Summary collapse

Methods inherited from Declaration

method_name, required?

Class Method Details

.execute(column_list, original_model, new_model, overrides) ⇒ Object

this is the algorithm for copying columns from the original record to the brand new copy of the record according to the instructions given in the copyable declaration



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# File 'lib/copyable/declarations/columns.rb', line 8

def self.execute(column_list, original_model, new_model, overrides)
  column_list.each do |column, advice|
    # when create_copy! is called, you can pass in a hash of
    # overrides that trumps the instructions in the copyable
    # declaration
    if overrides[column.to_sym].present?
      value = overrides[column.to_sym]
    elsif overrides[column.to_s].present?
      value = overrides[column.to_s]
    elsif advice == :copy
      value = original_model.send(column)
    elsif advice == :do_not_copy
      value = nil
    elsif advice.is_a? Proc
      value = advice.call(original_model)
    else
      message = "Error in copyable:columns of #{original_model.class.name}: "
      message << "the column '#{column}' must be :copy, :do_not_copy, or a lambda."
      raise ColumnError.new(message)
    end
    new_model.send("#{column}=", value)
  end
end