Question

我有一个ruby表单，可以在我的应用上提交练习报告。练习has_many报告。我想创建一个if语句，只有在该练习的最后一个报告保存超过3小时之前才会显示此表单。

到目前为止，我有：

但这是在创建一个NoMethodError undefined method 'report' for #<Exercise:0x007f9c892f48b0>。

它显示在我的workouts#show页面上（锻炼has_many练习，万一有帮助），所以我相信这是卫冕的控制者：

class WorkoutsController < ApplicationController
  def index
    @workouts = Workout.all
  end

  def show
    @workout = Workout.find(params[:id])
    @exercise = Exercise.new
    @report = Report.new
  end

  def new
    @workout = Workout.new
    @workout.user_id = current_user
  end

  def create
    @workout = Workout.new(workout_params)
    @workout.user = current_user

    if @workout.save
      flash[:notice] = "Workout was saved successfully."
      redirect_to @workout
    else
      flash.now[:alert] = "Error creating workout. Please try again."
      render :new
    end
  end

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

  def update
    @workout = Workout.find(params[:id])

    @workout.name = params[:workout][:name]
    @workout.workout_type = params[:workout][:workout_type]
    @workout.teaser = params[:workout][:teaser]
    @workout.description = params[:workout][:description]
    @workout.video = params[:workout][:video]
    @workout.difficulty = params[:workout][:difficulty]
    @workout.trainer = params[:workout][:trainer]
    @workout.user_id = params[:workout][:user_id]

    if @workout.save
       flash[:notice] = "Workout was updated successfully."
      redirect_to @workout
    else
      flash.now[:alert] = "Error saving workout. Please try again."
      render :edit
    end
  end

  def destroy
    @workout = Workout.find(params[:id])

    if @workout.destroy
      flash[:notice] = "\"#{@workout.name}\" was deleted successfully."
      redirect_to action: :index
    else
      flash.now[:alert] = "There was an error deleting the workout."
      render :show
    end
  end

  private
  def workout_params
    params.require(:workout).permit(:name, :workout_type, :teaser, :description, :video, :difficulty, :trainer, :user_id)
  end
end

我出错的任何想法？

其他信息：

此位在技术上位于我的workouts#show页面上：

<% if @workout.exercises.count == 0 %>
        <p>Looks like you get a freebie for this one!  No score report today.  Rest up and drink some water.  It ain't always that easy...</p>
      <% else %>
        <% @workout.exercises.each do |exercise| %>
          <%= render 'reports/form', report: @report, exercise: exercise %>
          <% if current_user.admin? %>
            <div class="text-center"><%= link_to "Delete #{exercise.name}", [exercise], method: :delete, data: { confirm: 'Are you sure?' } %></div>
          <% end %>
          <hr>
        <% end %>

但是这里是它呈现的部分，其中有问题的代码实际上在于：

<% if exercise.report.last != nil && exercise.report.last.created_at < ( DateTime.now - (3/24.0)) %>

<%= form_for report,
  :url => { :controller => "reports",
  :action => :create,
  :exercise_id => exercise.id } do |f| %>
<div class="row">

...

Answer 1

您似乎在调用单一report而不是reports。

if exercise.report.last

如果报告与has_many的锻炼有关，则需要使用exercise.reports.last

进行调用

此外，您在提问时提到了results，但在视图中调用reports。

练习有很多结果。

...

exercise.report.last

请务必使用适当的复数方法reports或results

Ruby：如果最后一个变量保存超过3小时前

1 个答案: