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Ruby Ohm, undefined method exception when trying create a model setting an array with ids

I have tried to set an array with ids in a model attribute like is explained within https://github.com/soveran/ohm#models but I get an exception. What is wrong in my code?

Model

class Event < Ohm::Model

attribute :title
set :attendees, :User

end

Test

@fran = User.create(name: "Fran", email: '[email protected]')
@jose = User.create(name: "Jose", email: '[email protected]')

event = Event.create(title: 'Party in Las Vegas', attendees: [@fran.id,@jose.id])

NoMethodError: undefined method `attendees=' for #<Event:0x000000020fb430>
    /home/ciro/.rvm/gems/ruby-2.1.3/gems/ohm-2.0.1/lib/ohm.rb:1470:in `block in update_attributes'
    /home/ciro/.rvm/gems/ruby-2.1.3/gems/ohm-2.0.1/lib/ohm.rb:1470:in `each'
    /home/ciro/.rvm/gems/ruby-2.1.3/gems/ohm-2.0.1/lib/ohm.rb:1470:in `update_attributes'
Solution

  • You need to use the Set#add method for this to work and that method only takes 1 argument:

    @fran = User.create(name: "Fran", email: '[email protected]')
@jose = User.create(name: "Jose", email: '[email protected]')

event = Event.create(title: 'Party in Las Vegas')
event.attendees.add(@fran)
event.attendees.add(@jose)

    If these are meant to be associations then I'd look at collections