Finding Rails ActiveModel Errors

Rails allows to filter ActiveModel erros by field name and type with the where method. Check this out:

user = User.new(email: "user@test.com")
user.valid?

user.errors.where(:email).map(&:full_message)
# => [
#      "Email has already been taken",
#      "Email is too short (minimum is 20 characters)"
#    ]

user.errors.where(:email, :taken).map(&:full_message)
# => ["Email has already been taken"]