Rails 4 - setting belongs_to relationship not working

Question

I have two models, Team and Plan. Team has a one to many relationship with plans, where plans can have many teams and each team have one plan. It looks like this:

#Plan
has_many :teams

#Team
belongs_to :plan

I'm using Stripe for recurring billing, and I'm using [webhooks][2] to keep my app synced with Stripe. To receive Stripe events I'm using the gem [stripe_event][3]. When subscriptions are created I want to set the plan to the newly created subscription plan. When I get the Stripe event customer.subscription.created I do the following:

events.subscribe 'customer.subscription.created' do |event|
  team = Team.find_by_stripe_customer_id(event.data.object.customer)
  create_subscription_for_team(team, event.data.object)

  # In this methods I want to set my plan
  set_team_plan(team, event.data.object.plan)
end

def set_team_plan(team, plan)
  team_plan = Plan.find_by_stripe_id(plan.id)
  team.update_attribute(plan_id: team_plan.id)
end

I don't get any errors what I can see, but the plan don't seem to get updated. I have also tried:

team.plan = team_plan
team.save!

But this gives me the same result. When I have logged I have confirmed that team_plan is the correct plan, and is not nil.

Any ideas on what I'm doing wrong?

Answer 1

Try adding the inverse relationships:

#Plan
has_many :teams, inverse_of: :plan

#Team
belongs_to :plan, inverse_of: teams

The inverse relationships help ensure that save works when you save subobjects.

Try looking at the id of each item before and after save:

p "team_plan.id:#{team_plan.id}, team.plan.id: #{team.plan.id}"
team.plan = team_plan
p "team_plan.id:#{team_plan.id}, team.plan.id:#{team.plan.id}"
team.save!
p "team_plan.id:#{team_plan.id}, team.plan.id:#{team.plan.id}"

If you're comfortable with Rails logger, or pry, or a debugger, use those instead of print statements. :)