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    assignment.rb associations.rb basics.rb callbacks.rb composite.rb conversions.rb database.rb index.rb modifiers.rb queries.rb spec.rb validations.rb

  • modifiers.rb

  • ¶

    Modeifiers in [Mongo Model][mongodb_model].

    Usually if You want to update model You load it, make changes and save it back. But if You want to update only some of attributes there’s more efficient way - modifiers.

    In this example we’ll create simpel model and update it using modifiers.

    require 'mongo/model'
  • ¶

    Connecting to test database and cleaning it before starting.

    Mongo::Model.default_database_name = :default_test
Mongo::Model.default_database.clear
  • ¶

    Defining game Unit.

    class Unit
  inherit Mongo::Model
  collection :units

  attr_accessor :name, :life
end
  • ¶

    Creating brave Tassadar.

    tassadar = Unit.create name: 'Tassadar', life: 80
  • ¶

    Updating model with modifiers.

    tassadar.update _inc: {life: -40}
tassadar.reload
p tassadar.life                                  # => 40
  • ¶

    There’s also helper on the model class.

    Unit.update({id: tassadar.id}, {_inc: {life: -20}})
tassadar.reload
p tassadar.life                                  # => 20
  • ¶

    In this example we covered using modifiers.