Question

我无法理解time_select的选项。我的目标是在表单提交后只在我的show动作中呈现用户创建的时间选择。

然而，正在发生的是为所有未被用户触摸的time_select字段呈现的默认时间12:00 AM。我正在寻找一种方法来停止保存默认时间值（如果我不得不猜测，这是不可能的），或创建一个条件，允许我阻止默认时间值的渲染。

到目前为止，我已查看以下内容并未成功：

Nil value on datetime_select?
Optional time_select with allow_blank defaults to 00:00
Rails time_select set default
Rails 3: How to prevent my validations to pass a "nil time" from time_select dropdowns?
http://api.rubyonrails.org/classes/ActionView/Helpers/DateHelper.html#method-i-time_select

这是我的代码：

_form.html.erb (only the snippet that I am having trouble with for brevity)


                    <td>
                    <span style="display: block; width: auto; margin-left: 4%">
                        <%= f.time_select :med1_time_of_day1, { include_blank: true, twelve_hour: true, minute_step: 15, ampm: true }, style: "width: 45%;" %>
                    </span>
                    <span style="display: block; width: auto; margin-left: 4%">
                        <%= f.time_select :med1_time_of_day2, { include_blank: true, twelve_hour: true, minute_step: 15, ampm: true }, style: "width: 45%;" %>
                    </span>
                    <span style="display: block; width: auto; margin-left: 4%">
                        <%= f.time_select :med1_time_of_day3, { include_blank: true, twelve_hour: true, minute_step: 15, ampm: true }, style: "width: 45%;" %>
                    </span>
                    <span style="display: block; width: auto; margin-left: 4%">
                        <%= f.time_select :med1_time_of_day4, { include_blank: true, twelve_hour: true, minute_step: 15, ampm: true }, style: "width: 45%;" %>
                    </span>
                </td>
                <td>

show.html.erb

<table class="table table-bordered table-striped">
        <thead>
            <th>Medication Name & Instructions for Use</th>
            <th>Time of Day</th>
            <th>
                Day(s) of the Month Medication was Taken
            </th>
        </thead>
        <tbody>
            <td>
                <%= @med_record_form.med1_name %>
                <%= @med_record_form.med1_instruct %>
            </td>
            <td>
                <% unless @med_record_form.med1_time_of_day1.nil? %>
                    <%= @med_record_form.med1_time_of_day1.strftime("%I:%M %p") %>
                    <br />
                <% end %>
                <% unless @med_record_form.med1_time_of_day2.nil? %>
                    <%= @med_record_form.med1_time_of_day2.strftime("%I:%M %p") %>
                    <br />
                <% end %>
                <% unless @med_record_form.med1_time_of_day3.nil? %>
                    <%= @med_record_form.med1_time_of_day3.strftime("%I:%M %p") %>
                    <br/>
                <% end %>
                <% unless @med_record_form.med1_time_of_day4.nil? %>
                    <%= @med_record_form.med1_time_of_day4.strftime("%I:%M %p") %>
                    <br />
                <% end %>
            </td>
        </tbody>
    </table>

注意：我也尝试过替换@ instance_var.nil？同 @ instance_var.blank？和@ instance_var.empty？没有成功。

以防万一需要控制器......

    med_record_forms_controller.rb

    class MedRecordFormsController < ApplicationController
  before_filter :get_resident

  def index
    @med_record_form = @resident.med_record_forms
  end

  def new
    @med_record_form = @resident.med_record_forms.build
  end

  def create
    @med_record_form = @resident.med_record_forms.build(params[:med_record_form])
    if @med_record_form.save
      redirect_to [@resident, @med_record_form] #, flash_class[:success] = "Form was created!"
    else
      render 'new' #, flash[:error] = "There was a problem with the form"
    end
  end

  def show
    @med_record_form = @resident.med_record_forms.find(params[:id])
  end

  def update
    @med_record_form = @resident.med_record_forms.find(params[:id])
    if @med_record_form.update_attributes(params[:med_record_form])
      flash[:success] = "Form updated"
      redirect_to controller: 'residents', action: 'show', id: params[:id]
    else
      render 'edit', flash[:error] = "Unable to update form"
    end
  end

  def edit
    @med_record_form = @resident.med_record_forms.find(params[:id])
  end

  def destroy
    @med_record_form = @resident.med_record_forms.find(params[:id])
    @med_record_form.destroy
    flash[:notice] = "You sure?"
    redirect_to resident_med_record_forms_path
  end

  private
  # get_resident converts the resident_id given by the routing
  # into an @resident object, for use in this controller & coresponding views
  def get_resident
    @resident = Resident.find(params[:resident_id])
  end
end

Answer 1

这个问题类似于：Optional time_select with allow_blank defaults to 00:00

我发现time_select的默认值将时间部分设置为空白，但是有一个隐藏的日期组件未设置为空白。查看参数时可以看到这一点：

“my_time（1i）”=＆gt;“1”，“my_time（2i）”=＆gt;“1”，“my_time（3i）”=＆gt;“1”，“my_time（4i）”=＆gt; ;“”，“my_time（5i）”=＆gt;“”

您需要在控制器中将时间设置为nil，如下所示：

def create
  @med_record_form = @resident.med_record_forms.build(params[:med_record_form])
  @med_record_form.med1_time_of_day1 = nil if params[:med_record_form]["med1_time_of_day1(4i)"].blank? && 
        params[:med_record_form]["med1_time_of_day1(5i)"].blank?
  if @med_record_form.save
    redirect_to [@resident, @med_record_form] #, flash_class[:success] = "Form was created!"
  else
    render 'new' #, flash[:error] = "There was a problem with the form"
  end
end

time_select空白字段保存表单提交时的默认时间

1 个答案: