Method: Og::Evolution#evolve_schema

Defined in:
lib/og/store/sql/evolution.rb

#evolve_schema(klass) ⇒ Object

Evolve the schema (table in sql stores) for the given class. Compares the fields in the database schema with the serializable attributes of the given class and tries to fix mismatches by adding are droping columns.

Evolution options

  • :evolve_schema => :add (only add, dont remove columns)

  • :evolve_schema => :full (add and delete columns)

  • :evolve_schema => :warn (only emit warnings, DEFAULT_

  • :evolve_schema => false (no evolution)

Example

Og.setup(

..
:evolve_schema => :full
..

)



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# File 'lib/og/store/sql/evolution.rb', line 59

def evolve_schema(klass)
  return unless @options[:evolve_schema]

  sql_fields = create_field_map(klass).keys
  attrs = serializable_attributes_for_class(klass)

  # Add new fields to the table.
  
  for field in attrs
    unless sql_fields.include? field
      unless @options[:evolve_schema] == :warn
        add_sql_field klass, field, klass.ann(field)
      else
        Logger.warn "Missing field '#{field}' on table '#{klass.table}'!"
      end
    end
  end
    
  # Remove obsolete fields from the table.
 
  for field in sql_fields
    unless attrs.include? field
      if @options[:evolve_schema] == :full 
        remove_sql_field klass, field
      else
        Logger.warn "Obsolete field '#{field}' found on table '#{klass.table}'!"
      end
    end
  end   
end