我试图添加time_select与include_blank.我这样做：
<%= f.time_select :start_at,include_blank: true,ampm: true %><br>
我想要做的是删除值(保存为零),如果在视图中选择空白.
虽然我尝试了以下职位,但对我来说并不奏效.
time_select blank field saves a default time when form is submitted
Optional time_select with allow_blank defaults to 00:00
1)当我尝试如下,没有出现错误,但00:00:00被保存.
调节器
def update
@event = Event.find(params[:id])
if event_params["start_at(4i)"].blank? or event_params["start_at(5i)"].blank?
@event.start_at = nil
end
if @event.update(event_params)
flash[:success] = "event updated!"
redirect_to root_url
else
render 'edit'
end
end
2)当我尝试如下(更改if子句)时,但00:00:00被保存.
调节器
def update
@event = Event.find(params[:id])
if params[:id]["start_at(4i)"].blank? or params[:id]["start_at(5i)"].blank?
@event.start_at = nil
end
if @event.update(event_params)
flash[:success] = "event updated!"
redirect_to root_url
else
render 'edit'
end
end
3)当我尝试如下(添加before_action),但00:00:00被保存.
调节器
before_action :blank_time,only: [:update]
def update
@event = Event.find(params[:id])
if @event.update(event_params)
flash[:success] = "event updated!"
redirect_to root_url
else
render 'edit'
end
end
private
def blank_time
if params[:id]["start_at(4i)"].blank? or params[:id]["start_at(5i)"].blank?
params[:id]['start_at(1i)'] = ""
params[:id]["start_at(2i)"] = ""
params[:id]["start_at(3i)"] = ""
params[:id]["start_at(4i)"] = ""
params[:id]["start_at(5i)"] = ""
end
end
4)当我尝试如下(使用nil而不是“”),出现错误.
IndexError (string not matched): app/controllers/events_controller.rb:106:in `[]=' app/controllers/events_controller.rb:106:in `blank_time'
调节器
before_action :blank_time,only: [:update]
def update
@event = Event.find(params[:id])
if @event.update(event_params)
flash[:success] = "event updated!"
redirect_to root_url
else
render 'edit'
end
end
private
def blank_time
if params[:id]["start_at(4i)"].blank? or params[:id]["start_at(5i)"].blank?
params[:id]['start_at(1i)'] = nil
params[:id]["start_at(2i)"] = nil
params[:id]["start_at(3i)"] = nil
params[:id]["start_at(4i)"] = nil
params[:id]["start_at(5i)"] = nil
end
end
如果你能给我任何建议,将不胜感激.
UPDATE
虽然我在以下更改了events_controller.rb中的编辑,但是显示了错误ActiveModel :: MissingAttributeError(不能写入未知属性’start_at(4i)’)：.
def edit
@room = Room.find(params[:room_id])
@event = @room.events.find(params[:id])
@event['start_at(4i)'] = @event.start_at.split(':')[0] #the error occur here
@event['start_at(5i)'] = @event.start_at.split(':')[1]
end
解决方法
我的想法是这样的：
移民：
class CreateTests < ActiveRecord::Migration[5.0] def change create_table :tests do |t| t.string :time t.timestamps end end end
形成：
<%= form_for(test) do |f| %>
<% if test.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(test.errors.count,"error") %> prohibited this test from being saved:</h2>
<ul>
<% test.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :time %>
<%= f.time_select :time,ampm: false %><br>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
控制器：
这将保存：当值发送为null时,可以使用条件来检查参数是否为空或设置时间值. //花费很多时间,我跳过你完成.
def create
@test = Test.new(test_params)
@time = (params[:test]['time(4i)']).to_s
@time_ampm = (params[:test]['time(5i)']).to_s
@test.time = @time+":"+ @time_ampm
respond_to do |format|
if @test.save
format.html { redirect_to @test,notice: 'Test was successfully created.' }
format.json { render :show,status: :created,location: @test }
else
format.html { render :new }
format.json { render json: @test.errors,status: :unprocessable_entity }
end
end
end
为了更新
def edit
@test = Test.find(params[:id])
@test['time(4i)'] = @test.time.split(':')[0]
@test['time(5i)'] = @test.time.split(':')[1]
end
def update
@test = Test.find(params[:id])
@time = (params[:test]['time(4i)']).to_s
@time_ampm = (params[:test]['time(5i)']).to_s
@test.time = @time+":"+ @time_ampm
@test.update(test_params)
end