Tip in joins

If you need to query users which profile is validated you may end up doing:

# User model
scope :activated, ->{
  joins(:profile).where(profiles: { activated: true })
}

Instead this use this aproach

# Profile model
scope :activated, ->{ where(activated: true) }

# User model
scope :activated, ->{ joins(:profile).merge(Profile.activated) }

https://medium.com/@apneadiving