我正在研究STMS。我正试图模拟出来并试图通过以下方式为学生表添加新记录:
stud = Student.create(:student_id => 1, :first_name => 'Jos', :last_name => 'Norton', :email => 'ss.norton@gmail.com', :birthday => '12/05/1995', :subjects => 'English', :username => 'samnorton05', :password => 'Grace02112')
我收到了一个错误:
ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association :enrolled_subjects in model Student
这是我正在使用的模型:
class Student < ApplicationRecord
has_many :subjects, through: :enrolled_subjects
has_many :teachers, through: :enrolled_subjects
def teacher_names
self.teachers.map(&:name).join(", ")
end
has_many :admin_users
has_secure_password
self.primary_key = :student_id
scope :newest_first, lambda { order("created_at ASC") }
scope :oldest_first, lambda { order("created_at DESC") }
# scope :search, lambda { |query| where(["name LIKE ?", "%#{query}%"])}
end
class Teacher < ApplicationRecord
has_many :subjects, through: :enrolled_subjects
has_many :students, through: :enrolled_subjects
has_many :admin_users
has_secure_password
scope :newest_first, lambda { order("created_at ASC") }
scope :oldest_first, lambda { order("created_at DESC") }
# scope :search, lambda { |query| where(["name LIKE ?", "%#{query}%"])}
end
class Subject < ApplicationRecord
has_many :students, through: :enrolled_subjects
has_many :teachers, through: :enrolled_subjects
has_many :admin_users
# scope :search, lambda { |query| where(["name LIKE ?", "%#{query}%"])}
end
class EnrolledSubject < ApplicationRecord
belongs_to :student
belongs_to :subject
belongs_to :teacher
end
class AdminUser < ApplicationRecord
has_secure_password
scope :newest_first, lambda { order("created_at ASC") }
scope :oldest_first, lambda { order("created_at DESC") }
# scope :search, lambda { |query| where(["name LIKE ?", "%#{query}%"])}
end
基本上我有5个表:学生,教师,科目,管理员用户和注册科目。知道我做错了什么吗?对不起,我是新手。
编辑这里是我的移民:
create_table :students, :id => false do |t|
t.integer "student_id", :auto_increment => true, :primary_key => true
t.string "first_name", :limit => 25
t.string "last_name", :limit => 50
t.string "email", :default => ' ', :null => false
t.string "birthday"
t.string "subjects"
t.string "username", :limit => 25
t.string "password_digest"
t.timestamps
end
create_table :teachers, :id => false do |t|
t.integer "teacher_id", :auto_increment => true, :primary_key => true
t.string "first_name"
t.string "last_name"
t.string "email", :default => ' ', :null => false
t.string "birthday"
t.string "subjects"
t.string "username", :limit => 25
t.string "password_digest"
t.timestamps
end
答案 0 :(得分:1)
您还应该添加enrolled_subjects,例如:
class Student < ApplicationRecord
# first you add the association to enrolled_subjects
has_many :enrolled_subjects
# then you add the associations you has through it
has_many :subjects, through: :enrolled_subjects
has_many :teachers, through: :enrolled_subjects
end