Question

我找不到关联的问题，但不断收到与关联相关的错误。我将has_many添加到学校，并将belongs_to添加到成员。

 class CreateSchools < ActiveRecord::Migration[5.0]
def change
create_table :schools do |t|
  t.string :name

  t.timestamps
end

端

 class AddSchoolRefToMembers < ActiveRecord::Migration[5.0]
def change
  add_reference :members, :school, foreign_key: true
end

端端

class MembersController < ActionController::Base
 before_action :set_school
def index
 @members = Member.all
end
def new
  @member = Member.new
end

def create
 @member = Member.new(member_params)
 @member.school = @school
 @member.save
 redirect_to members_path
end


private

def set_school
 @school = School.find(params[:school])

end

def member_params
  params.require(:member).permit(:name, :email,:school)
end

端

控制器：

{{1}}

端

Answer 1

不应分配@school本身，而应分配该学校的ID：

def create
 @member = Member.new(member_params)
 @member.school = @school.id      # here it is @school.id 
 @member.save
 redirect_to members_path
end

关联使用ID而不是Arrays。 @school完全返回学校记录，你只需要id来创建关联。

两个模型在轨道，控制器之间的关联

1 个答案: