兩個模型之間的關聯，控制器

Question

我找不到與我的關聯的問題，但不斷得到與關聯有關的錯誤。我將has_many添加到學校，並且屬於成員。

class CreateMembers < ActiveRecord::Migration[5.0] 
    def change 
    create_table :members do |t| 
    t.string :name 
    t.string :email 
    t.timestamps 
    end 
end 

端

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

    t.timestamps 
end 

端 端

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

端

控制器：

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 

末

Answer 1

而是分配@school本身，你應該分配一個學校的ID：

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

的關聯使用IDs不是數組。 @school完全返回學校記錄，您只需要該ID即可創建關聯。