How to fix Rails console error about ActiveRecord::StatementInvalid

Question

I am implementing a Student class which inherits from a User class using STI in Rails. Each Student is associated with a StudentRecord via a has_one association where each StudentRecord belongs to a Student.

In the console , when I add a StudentRecord via student.build_student_record and I call student.save I receive an error of the form "ActiveRecord::StatementInvalid..." . However, when I test this same functionality using rails test I receive no errors...

test/models/student_test.rb :

class StudentTest < ActiveSupport::TestCase
  test "create Student with student_record" do
    student = Student.create(
      name:  "Example Student", 
      email: "example@student.org",
      password:              "foobar",
      password_confirmation: "foobar")
    student.build_student_record(student_number: 12345)
    student.save
    student = student.reload
    assert_equal 12345, student.student_record.student_number
  end
end

Here is a photo of the console error , and I have added my other relevant code below.

app/models/user.rb :

class User < ApplicationRecord
  ...
end

db/migrate/[timestamp]_add_type_to_users :

class AddTypeToUsers < ActiveRecord::Migration[5.1]
  def change
    add_column :users, :type, :string
  end
end

app/models/student.rb :

class Student < User
  has_one :student_record
end

db/migrate/[timestamp]_create_student_records.rb :

class CreateStudentRecords < ActiveRecord::Migration[5.1]
  def change
    create_table :student_records do |t|
      t.integer :student_number
      t.references :student, foreign_key: true
      t.timestamps
    end
  end
end

app/models/student_record :

class StudentRecord < ApplicationRecord
  belongs_to :student
  validates :student_id, presence: true
  validates :student_number, presence: true
end

Answer 1

KBIIX's solution above appears to fix the error too, however I have ended up changing the line in db/migrate/[timestamp]_create_student_records.rb to:

t.references :student, foreign_key: { to_table: :users }

..in case anyone is curious.