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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

  • assignment.rb

  • ¶

    Mass assignment for [Mongo Model][mongodb_model].

    In this example we’ll discover how to define attribute types, and protect some of them from mass assignment.

    require 'mongo/model'
  • ¶

    Connecting to test database and cleaning it before starting.

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

    Let’s define User.

    class User
  inherit Mongo::Model

  attr_accessor :name, :age
end
  • ¶

    By defautl there’s no any types and You can assign anything to any attribute using the set method.

    user = User.new
user.set name: 'Gordon Freeman', age: '28'
p [user.name, user.age]                          # => ['Gordon Freeman', '28']
  • ¶

    In previous example the age attribute is supposed to be Integer but it has been assigned as String. This is wrong, we need to fix it.

    class User
  • ¶

    Declaring attribute tupes, and allowing to update it in mass assignment.

      assign do
    name String,  true
    age  Integer, true
  end
  • ¶

    There’s also another version of declaring attribute type.

      assign :name, String, true
end
  • ¶

    This time String has been casted to Integer before assigning it to the age attribute.

    user.set name: 'Gordon Freeman', age: '28'
p [user.name, user.age]                          # => ['Gordon Freeman', 28]
  • ¶

    There are some sensitive attributes that shouldn’t be allowed to update in mass assignment, let’s add the password attribute and make it protected.

    class User
  • ¶

    Actually there’s no need to explicitly specify that attribute is protected, if You don’t explicitly allow it to be updated by mass assignment it will be protected.

      attr_accessor :password
end
  • ¶

    If we try to to change password using mass assignment we got an error.

    user.set(password: 'Black Mesa') rescue p('No!') # => "No!"
p user.password                                  # => nil
  • ¶

    You can forcefully assign protected attribute if You want.

    user.set! password: 'Black Mesa'
p user.password                                  # => "Black Mesa"
  • ¶

    In this example we covered mass assignment, attribute types and attribute protection.