Question

点击＆＃34;提交＆＃34;我试图让两个表同时更新。在一种形式。有一个＆＃34;锻炼＆＃34;桌子和练习＆＃34;表;锻炼has_many练习。出于某种原因，点击＆＃34;提交＆＃34;在表格上，只有＆＃34;锻炼＆＃34;表得到更新，而不是＆＃34;练习＆＃34;表。下面是控制器，视图和模型。我使用的是Ruby 2.3，Rails 5.0和Windows PC。

锻炼控制器（workouts_controller.rb）

class WorkoutsController < ApplicationController    
def new
    @workout = Workout.new
    @workout.exercises.build
end

def create
    @workout = Workout.create(workout_params)
    if @workout.save
        redirect_to @workout
    end
end

def show
    @workout = Workout.find(params[:id])
    @exercises = @workout.exercises
end

private
    def workout_params
        params.require(:workout).permit(:workout_length, :workout_description, :video_url, exercises_attributes: [:exercise_description])
    end
end

新锻炼视图（锻炼\ new.html.erb）

<h1>Create New Workout</h1>

<%= form_for(@workout) do |f| %>
  <%= f.number_field :workout_length, :placeholder => "Workout length (minutes)" %> <br>
  <%= f.text_field :workout_description, :placeholder => "Workout description" %> <br>
  <%= f.url_field :video_url, :placeholder => "Video URL" %> <br>

  <%= fields_for :exercises do |builder| %>
    <p>
    <%= builder.label :exercise_description %>
    <%= builder.text_field :exercise_description %>
    </p>
  <% end %>

  <%= f.submit "SUBMIT WORKOUT"  %>
<% end %>

锻炼模型（workout.rb）

class Workout < ActiveRecord::Base
    has_many :exercises, :dependent => :destroy
    accepts_nested_attributes_for :exercises
    validates_associated :exercises
end

运动模型（exercise.rb）

class Exercise < ActiveRecord::Base
   belongs_to :workout
end

锻炼迁移（_create_workouts.rb）

class CreateWorkouts < ActiveRecord::Migration[5.0]
  def change
    create_table :workouts do |t|
      t.integer :workout_length
      t.string :workout_description
      t.string :video_url

      t.timestamps
    end
  end
end

练习迁移（_create_exercises.rb）

class CreateExercises < ActiveRecord::Migration[5.0]
  def change
    create_table :exercises do |t|
      t.string :exercise_description
      t.references :workout, foreign_key: true

      t.timestamps
    end
  end
end

我提交表格后，＆＃34;锻炼＆＃34;表按预期通过INSERT语句更新，但是＆＃34;练习＆＃34; table没有任何新行...没有为＆＃34; exercise＆＃34;执行INSERT语句。关于为什么＆＃34;练习＆＃34;表没有得到更新???

Answer 1

如果您对嵌套属性执行fields_for，则必须使用属于更高级别表单对象的fields_for方法。

所以不要......

<%= fields_for :exercises do |builder| %>

...做

<%= f.fields_for :exercises do |builder| %>

在Rails 5.0中使用accepts_nested_attributes_for方法时，嵌套表不会更新，Ruby 2.3

1 个答案: