Module: ArJdbc::Util::SerializedAttributes

Defined in:
lib/arjdbc/util/serialized_attributes.rb

Overview

Gets included into ActiveRecord::Base to support sending LOB values in a separate update SQL statement for DB adapters that need this.

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.dump_column_value(record, column) ⇒ Object 



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# File 'lib/arjdbc/util/serialized_attributes.rb', line 34

def self.dump_column_value(record, column)
  value = record[ column.name.to_s ]
  column.cast_type.type_cast_for_database(value)
end

.setup(lob_type = nil, after_save_alias = nil) ⇒ Object 



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# File 'lib/arjdbc/util/serialized_attributes.rb', line 59

def self.setup(lob_type = nil, after_save_alias = nil)
  ActiveRecord::Base.send :include, self # include SerializedAttributes
  ActiveRecord::Base.lob_type = lob_type unless lob_type.nil?
  if after_save_alias
    ActiveRecord::Base.class_eval do
      alias_method after_save_alias, 'update_lob_columns'
    end
    ActiveRecord::Base.after_save after_save_alias
  else
    ActiveRecord::Base.after_save 'update_lob_columns'
  end
end

Instance Method Details

#update_lob_columns ⇒ Object

protected



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# File 'lib/arjdbc/util/serialized_attributes.rb', line 9

def update_lob_columns
  klass = self.class
  return unless type = klass.lob_type # e.g. /blob/i
  connection = klass.connection
  if connection.respond_to?(:update_lob_values?)
    return false unless connection.update_lob_values?
  end
  klass.columns.each do |column|
    next if column.sql_type !~ type
    next if ( value = dump_column_value(column) ).nil?
    if connection.respond_to?(:update_lob_value?)
      next unless connection.update_lob_value?(value, column)
    end
    connection.update_lob_value(self, column, value)
  end
end