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Contents
module Copyable
module Declarations
class Columns < Declaration
# 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
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
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems