Ruby on Rails - how to set models to true?

Question

Ruby on Rails

I'm learning Ruby On Rails and I have a question about models.
The model has a boolean field. Only one entry in the collection can be set to true, the rest are reset to false.
How to correctly implement?

Answer 1

The easiest way is to select a model in which the field is true and replace it with false before saving. Or add a method that will be a trigger to replace the bool field.
api.rubyonrails.org/classes/ActiveRecord/Callbacks.html
apidock.com/rails/v4.0.2/ActiveRecord/Persistence/...

Answer 2

before_save :method

def method
  if column_changed? and column?
    Model.where(column: true).update_all(column: false)
  end
end

column - your column
Model - model.