Module: DataMapper::Adapters::AbstractAdapter::Coersion

Defined in:
lib/data_mapper/adapters/abstract_adapter.rb

Overview

Coersion is a mixin that allows for coercing database values to Ruby Types.

DESIGN: Probably should handle the opposite scenario here too. I believe that’s currently in DataMapper::Database, which is obviously not a very good spot for it.

Instance Method Summary collapse

Instance Method Details

#type_cast_value(type, raw_value) ⇒ Object 



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# File 'lib/data_mapper/adapters/abstract_adapter.rb', line 139

def type_cast_value(type, raw_value)
  return nil if raw_value.nil?

  case type
  when :class then Kernel::const_get(raw_value)
  when :string, :text then
    return nil if raw_value.nil?
    value_as_string = raw_value.to_s.strip
    return nil if value_as_string.empty?
    value_as_string
  when :integer then
    return nil if raw_value.nil? || (raw_value.kind_of?(String) && raw_value.empty?)
    begin
      Integer(raw_value)
    rescue ArgumentError
      nil
    end
  else
    if respond_to?("type_cast_#{type}")
      send("type_cast_#{type}", raw_value)
    else
      raise "Don't know how to type-cast #{{ type => raw_value }.inspect }"
    end
  end      
end