我的应用程序中有以下结构：
resources :workouts do
resources :exercises
end
锻炼has_many练习。我显示了它，以便在workouts#show页面上有一个指向exercises#index页面的链接，用于添加/编辑属于该锻炼的练习。在exercises#index页面上，练习列表会正确填充，但是当我尝试删除练习时，会出现此错误：Couldn't find Exercise with 'id'=10 [WHERE "exercises"."workout_id" = ?]
我的exercises#index页面是：
<div class="container col-sm-10 col-sm-push-1" style="margin-top: 100px">
<div class="opaque-card md-well well">
<h1>Current Exercises:</h1>
<% @exercises.each do |exercise| %>
<p><%= exercise.name %> (<%= link_to "Delete #{exercise.name}", workout_exercise_path(@workout, exercise), method: :delete, data: { confirm: 'Are you sure?' } %>)</p>
<% end %>
<h1>Add New Exercises:</h1>
<%= render 'exercises/form' %>
</div> <!-- opaque card -->
</div> <!-- container -->
我相应的routes是：
workout_exercises GET /workouts/:workout_id/exercises(.:format) exercises#index
POST /workouts/:workout_id/exercises(.:format) exercises#create
new_workout_exercise GET /workouts/:workout_id/exercises/new(.:format) exercises#new
edit_workout_exercise GET /workouts/:workout_id/exercises/:id/edit(.:format) exercises#edit
workout_exercise GET /workouts/:workout_id/exercises/:id(.:format) exercises#show
PATCH /workouts/:workout_id/exercises/:id(.:format) exercises#update
PUT /workouts/:workout_id/exercises/:id(.:format) exercises#update
DELETE /workouts/:workout_id/exercises/:id(.:format) exercises#destroy
workouts GET /workouts(.:format) workouts#index
POST /workouts(.:format) workouts#create
new_workout GET /workouts/new(.:format) workouts#new
edit_workout GET /workouts/:id/edit(.:format) workouts#edit
workout GET /workouts/:id(.:format) workouts#show
PATCH /workouts/:id(.:format) workouts#update
PUT /workouts/:id(.:format) workouts#update
DELETE /workouts/:id(.:format) workouts#destroy
这是我的exercises_controller.rb：
class ExercisesController < ApplicationController
before_action :authenticate_user!
def index
@workout = Workout.friendly.find(params[:workout_id])
@exercise = Exercise.new
@exercises = Exercise.all
end
def new
@workout = Workout.friendly.find(params[:id])
@exercise = Exercise.new
end
def create
# require 'pry' ; binding.pry
@workout = Workout.friendly.find(params[:workout_id])
exercise = @workout.exercises.build(exercise_params)
exercise.user = current_user
if exercise.save
flash[:notice] = "Exercise created successfully."
redirect_to [@workout]
else
flash[:alert] = "The exercise failed to save."
redirect_to [@workout]
end
end
def edit
@workout = Workout.friendly.find(params[:id])
exercise = Exercise.find(params[:id])
exercise.user = current_user
end
def destroy
@workout = Workout.friendly.find(params[:workout_id])
exercise = @workout.exercises.find(params[:id])
if exercise.destroy
flash[:notice] = "Exercise was deleted successfully."
redirect_to [@workout]
else
flash[:alert] = "Exercise couldn't be deleted. Try again."
redirect_to [@workout]
end
end
private
def exercise_params
params.require(:exercise).permit(:name, :needs_seconds, :needs_weight, :needs_reps, :workout_id)
end
def authorize_user
exercise = Exercise.find(params[:id])
unless current_user == current_user.admin?
flash[:alert] = "You do not have permission to create or delete an exercise."
redirect_to [exercise.workout]
end
end
end
我已经尝试过取消嵌套路由，导致的错误远远多于它的解析。任何人都可以看到为什么我收到此错误或如何解决它？
ADDED：以下是来自错误之前的服务器日志的params：
Started DELETE "/workouts/d/exercises/10" for ::1 at 2016-06-05 10:39:29 -0700
Processing by ExercisesController#destroy as HTML
Parameters: {"authenticity_token"=>"xAWbVPHRNJeGSWhThaAMDf/FUYXav4WXrMBnjoX7s3g+gTQEVo0r9wIhSxIB+yH8sdwhcxfDZV9SinaLSUEiMA==", "workout_id"=>"d", "id"=>"10"}
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Workout Load (0.1ms) SELECT "workouts".* FROM "workouts" WHERE "workouts"."slug" = ? ORDER BY "workouts"."id" ASC LIMIT 1 [["slug", "d"]]
Exercise Load (0.2ms) SELECT "exercises".* FROM "exercises" WHERE "exercises"."workout_id" = ? AND "exercises"."id" = ? LIMIT 1 [["workout_id", 4], ["id", 10]]
Completed 404 Not Found in 6ms (ActiveRecord: 0.4ms)
ActiveRecord::RecordNotFound - Couldn't find Exercise with 'id'=10 [WHERE "exercises"."workout_id" = ?]:
ADDED：exercises#index中引用的表单：
<div class="row">
<div class="col-xs-10 col-xs-push-1">
<%= form_for [@workout, @exercise] do |f| %>
<%= f.hidden_field :workout_id, value: @workout.id %>
<div class="form-group">
<%= f.label :name, class: 'sr-only' %>
<%= f.text_field :name, class: 'form-control', placeholder: "Enter exercise name" %>
</div>
<div class="form-group col-xs-4">
<p><%= f.label :needs_seconds, class: 'sr-only' %>
<%= f.check_box :needs_seconds, class: 'check_box' %> Report seconds?</p>
</div>
<div class="form-group col-xs-4">
<p><%= f.label :needs_reps, class: 'sr-only' %>
<%= f.check_box :needs_reps, class: 'check_box' %> Report reps?</p>
</div>
<div class="form-group col-xs-4">
<p><%= f.label :needs_weight, class: 'sr-only' %>
<%= f.check_box :needs_weight, class: 'check_box' %> Report weight?</p>
</div>
<div class="text-center"><%= f.submit "Create Exercise", class: 'btn btn-primary' %></div>
<% end %>
</div>
</div>
答案 0 :(得分：0)
我认为问题是Workout.friendly.find(params[:workout_id])没有找到任何记录。你可以通过将它打印到rails控制台来确保它找到了一些东西，
@workout = Workout.friendly.find(params[:workout_id])
exercise = @workout.exercises.find(params[:id])
p "Workout: ", @workout
p "Exercise: ", exercise #they should print the found object or nil in your rails server console
如果你看到nil我会说通过友好ID发现导致问题。
更新
我的坏。我没见过。所以，当你正在构建练习时，你正在通过exercise_params，如果你注意到exercise_params也有一个workout_id必须通过nil，那么它会重写{{1}的值在新创建的workout_id中。从你的exercise参数中删除workout_id。并尝试再创建一些exersize并再次测试。
答案 1 :(得分：0)
ActiveRecord :: RecordNotFound - 无法找到练习＆＃39; id＆＃39; = 10 [在哪里＆＃34;练习＆＃34;。＆＃34; workout_id＆＃34; =？]
您的代码中存在两个问题。首先，@exercises变量包含 所有练习记录 ，而不是 @ exercise＆＃39> 。其次，使用exercise变量，您试图找到 锻炼 ，其中params[:id]实际上是{{1}在视图中循环的id之一。所以Rails无法使用 组合（：workout_id＆amp;：id） 找到记录，错误也是如此。
<强> 解决方案
在@exercises方法中将exercise = @workout.exercises.find(params[:id])更改为exercise = Exercise.find(params[:id])。
destroy