如何为 RoR 中的项目添加租用时间答案

【问题标题】：How to add renting times for an Item in RoR如何为 RoR 中的项目添加租用时间
【发布时间】：2018-06-16 15:25:30
【问题描述】：

我目前正在制作一个租赁系统，在该系统中，我需要使用 RoR 为何时租赁以及何时归还租赁物品创建一个时间。我的代码将时间保存在数据库中，然后回滚错误value required 2, got nil。

以下是我的代码：

AcquiretimesController < ApplicationController

def create

    @item = Item.find(params[:item_id])

    @acquiretime = @item.acquiretimes.create(time_params)

    if @acquiretime.valid?
        flash[:success] = "You have successfully rented the item"
        redirect_to root_path
    else
        flash[:alert] = "Woops! Looks like there has been error. Please enter valid data."
        redirect_to root_path
    end
end

private

def time_params
    params.require(:acquiretime).permit(:required_time, :return_time)
end

在我看来，我使用了以下内容：

<%= simple_form_for [current_item, @acquiretime] do |f| %>
    <div class = "add_item_form">            
        <%= f.input :required_time, as: :date, html5: true %>
        <%= f.input :return_time, as: :date, html5: true  %>
    </div>
    <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <%= f.submit 'Add Item', class: 'btn btn-primary' %>
    </div>
<% end %>

我的 Acquiretime 模型是：

class Acquiretime < ApplicationRecord belongs_to :item belongs_to :users validates :required_time, :return_time, presence: true end

对于物品，

class Item < ApplicationRecord belongs_to :user has_many :acquiretimes end

还有用户，

class User < ApplicationRecord has_many :items has_one :acquiretime end

以下是我在控制台中的错误消息：

在 2018-01-07 18:28:04 +0545 为 127.0.0.1 开始 POST "/items/3/acquiretimes" AcquiretimesController#create as HTML 处理参数：{"utf8"=>"✓", "authenticity_token"=>"Zo9qj1VsLlMwgwSozATh2C//tMQHbFOaMvZ1IddeVdQxG7enNDmPWe64RO/1CmmpBlevmSfJ7/w9Fzey5NxP8A==", "acquiretime"=>{"required_time"=>"2018-01- return_time"=>"2018-01-22"}, "commit"=>"添加项目", "item_id"=>"3"} 项目加载 (0.3ms) SELECT "items".* FROM "items" WHERE "items"."id" = $1 LIMIT $2 [["id", 3], ["LIMIT", 1]] (0.2ms) 开始 (0.2ms) 提交 (0.1ms) 开始 (0.1ms) 回滚在 117 毫秒内完成 500 内部服务器错误（ActiveRecord：1.0 毫秒）

ArgumentError（参数数量错误（给定 0，预期为 2））： app/controllers/acquiretimes_controller.rb:18:in `create' 在救援中渲染 /home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb /布局渲染/home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb 渲染 /home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (5.7小姐）渲染/home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb 渲染 /home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.7小姐）渲染/home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb 渲染 /home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (2.7小姐）在救援中渲染 /home/skj/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb /布局（107.9 毫秒）

【问题讨论】：

发生回滚时能否发布控制台输出？
@kuwantum，我添加了错误，请看一下
app/controllers/acquiretimes_controller.rb（第 18 行）- 那一行是什么？好像有问题
这是警报信息部分
你能发布你的模型代码（我想是 Aquiretime）吗？

标签： ruby-on-rails

【解决方案1】：

在上面回复部分的@TheMouseMan的帮助下，问题已经解决了。我遇到的问题是 Acquiretime.rb 中的拼写错误，我写了belongs_to :users，但应该是belongs_to :user。接下来是使用 hidden_field 从表单中传递 user.id： <%= f.hiddent_field :user_id, value: current_user.id%>

【讨论】：