如何在视图中仅显示任务模型的范围实例

如何解决如何在视图中仅显示任务模型的范围实例

我正在用 Rails 构建一个任务管理器。我使用范围来获取今天到期的任务模型的所有实例。在 Rails 控制台中对 Tasks 调用 Due_today 时，Task 模型上的作用域有效并且仅返回今天到期的 Tasks。但是我似乎无法在视图中显示今天到期的这些任务。我需要添加条件吗？

这是我的观点 index.html.erb

<p id="notice"><%= notice %></p>

<h1>Team's Tasks</h1>

<table>
  <thead>
    <tr>
      <th>Task title</th>
      <th>Description</th>
      <th>Date assigned</th>
      <th>Due date</th>
      <th>Overdue?</th>
      <th>Completed?</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @tasks.each do |task| %>
      <tr>
        <td><%= task.title %></td>
        <td><%= task.description %></td>
        <td><%= task.created_at %></td>
        <td><%= task.duedate %></td>
        <td><%= task.overdue? %></td>
        <td><%= task.completed %></td>
        <td><%= link_to 'Show',task %></td>
        <td><%= link_to 'Edit',edit_task_path(task) %></td>
        <td><%= link_to 'Destroy',task,method: :delete,data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<h1>Tasks due today.</h1>

<table>
  <thead>
    <tr>
      <th>Task title</th>
      <th>Description</th>
      <th>Date assigned</th>
      <th>Due date</th>
      <th>Overdue?</th>
      <th>Completed?</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @tasks.due_today.each do |task| %>
      <tr>
        <td><%= task.title %></td>
        <td><%= task.description %></td>
        <td><%= task.created_at %></td>
        <td><%= task.duedate %></td>
        <td><%= task.overdue? %></td>
        <td><%= task.completed %></td>
        <td><%= link_to 'Show',data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>
<br>

<p>
  <%= link_to 'New Task',new_task_path %>
</p>

这是我的任务模型

class Task < ApplicationRecord
  #use scope on Task model to mark overdue Tasks if the present date is greater than duedate.
  scope :overdue,-> { where("duedate < ?",Time.Now) }
  #use scope on Task model to get only tasks that are due today.
  scope :due_today,->{ where("duedate >= ? AND duedate <= ?",Date.current.beginning_of_day,Date.current.end_of_day) }

end

这是控制器

class TasksController < ApplicationController
  before_action :set_task,only: %i[ show edit update destroy ]

  # GET /tasks or /tasks.json
  # Order all tasks by ascending order
  def index
    @tasks = Task.all.order(duedate: :asc)
  end

  # GET /tasks/1 or /tasks/1.json
  def show
  end

  # GET /tasks/new
  def new
    @task = Task.new
  end

  # GET /tasks/1/edit
  def edit
  end

  # POST /tasks or /tasks.json
  def create
    @task = Task.new(task_params)

    respond_to do |format|
      if @task.save
        format.html { redirect_to @task,notice: "Task was successfully created." }
        format.json { render :show,status: :created,location: @task }
      else
        format.html { render :new,status: :unprocessable_entity }
        format.json { render json: @task.errors,status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /tasks/1 or /tasks/1.json
  def update
    respond_to do |format|
      if @task.update(task_params)
        format.html { redirect_to @task,notice: "Task was successfully updated." }
        format.json { render :show,status: :ok,location: @task }
      else
        format.html { render :edit,status: :unprocessable_entity }
      end
    end
  end

  # DELETE /tasks/1 or /tasks/1.json
  def destroy
    @task.destroy
    respond_to do |format|
      format.html { redirect_to tasks_url,notice: "Task was successfully destroyed." }
      format.json { head :no_content }
    end
  end

  private
        # Use callbacks to share common setup or constraints between actions.

    def set_task
      @task = Task.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def task_params
      params.require(:task).permit(:title,:description,:duedate,:completed)
    end
end

解决方法

我假设你有一个 TasksController 和一个 index 方法。

尝试使用索引方法

let attempt = 1;
let rN; 
function EmitRandomNumber() {
    return new Promise((resolve,reject)=> {
        console.log(`Attempt #${attempt}. EmitRandomNumber is called.`);
        setTimeout(()=>{
            let randomNumber = Math.floor(Math.random() * 100) + 1;
            rN = randomNumber;
            console.log("2 seconds have passed.");
            
            if(randomNumber>=80&&attempt<=10){
                console.log(randomNumber,attempt);

                resolve();
            }else if(randomNumber<80&&attempt<=10){
                attempt++;
                console.log(`Random number generated is ${randomNumber}.`);
                console.log("===============================");
                EmitRandomNumber();
            }
        },2000);
    });
  }

let promise = EmitRandomNumber();

promise.then(()=>{
    console.log(`Random number generated is ${rN}!!!!`);
    console.log("===============================");
}).catch(()=>{
    console.log("End");
});

告诉我这是否有效

,

您需要更改 due_date 范围.. 使用 between 或 date_trunc 方法。

where("date_trunc('day',Duedate)::date = ?",Date.today)

告诉我它是否有效

,

开始工作。控制器没有变化。不需要。这是代码。

这是任务模型。

class Task < ApplicationRecord
  #use scope on Task model to mark overdue Tasks if the present date is greater than duedate.
  scope :overdue,-> { where("duedate < ?",Time.now) }
  #use scope on Task model to get Tasks due today.
  scope :due_today,->{ where("duedate >= ? AND duedate <= ?",Date.current.beginning_of_day,Date.current.end_of_day) }

  def overdue?
    duedate < Time.now
  end

  def due_today?
    duedate >= Date.current.beginning_of_day && duedate <= Date.current.end_of_day
  end

end

这是任务视图。

<p id="notice"><%= notice %></p>

<h1>Team Task Manager</h1>

<table>
  <thead>
    <tr>
      <th>Task</th>
      <th>Description</th>
      <th>Date assigned</th>
      <th>Due date</th>
      <th>Overdue?</th>
      <th>Completed?</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @tasks.each do |task| %>
      <tr>
        <td><%= task.title %></td>
        <td><%= task.description %></td>
        <td><%= task.created_at %></td>
        <td><%= task.duedate %></td>
        <td><%= task.overdue? %></td>
        <td><%= task.completed %></td>
        <td><%= link_to 'Show',task %></td>
        <td><%= link_to 'Edit',edit_task_path(task) %></td>
        <td><%= link_to 'Destroy',task,method: :delete,data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>
<br>

<h1>DUE TODAY!</h1>
<table>
  <thead>
    <tr>
      <th>Task</th>
      <th>Description</th>
      <th>Date assigned</th>
      <th>Due date</th>
      <th>Overdue?</th>
      <th>Completed?</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @tasks.due_today.each do |task| %>
      <tr>
        <td><%= task.title %></td>
        <td><%= task.description %></td>
        <td><%= task.created_at %></td>
        <td><%= task.duedate %></td>
        <td><%= task.overdue? %></td>
        <td><%= task.completed %></td>
        <td><%= link_to 'Show',data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<p>
  <%= link_to 'New Task',new_task_path %>
</p>