Rails-无法在datetime中更新hour

Question

我有一个rails应用程序，其中"RFQ"具有日期时间属性。日期在表格中发生了更改，但我想将时间设置为15:00。

当我创建RFQ时，它工作正常，但如果我编辑它，它将变为00:00:00

创建操作：

 def create
   @rfq = Rfq.new(rfq_params)
    @rfq.owner = current_user.email
    @rfq.due = @rfq.due.change(hour: 15)
    respond_to do |format|
      if @rfq.save
        format.html { redirect_to @rfq, notice: 'Rfq was successfully created.' }
        format.json { render :show, status: :created, location: @rfq }
      else
        format.html { render :new }
        format.json { render json: @rfq.errors, status: :unprocessable_entity }
      end
    end
  end

更新动作

 def update
    @rfq.owner = current_user.email
    @rfq.due = @rfq.due.change(hour: 15)
    respond_to do |format|
      if @rfq.update(rfq_params)
        format.html { redirect_to @rfq, notice: 'Rfq was successfully updated.' }
        format.json { render :show, status: :ok, location: @rfq }
      else
        format.html { render :edit }
        format.json { render json: @rfq.errors, status: :unprocessable_entity }
      end
    end
  end

创建后：

  Rfq Load (0.2ms)  SELECT  "rfqs".* FROM "rfqs"  ORDER BY "rfqs"."id" DESC LIMIT 1
 => Wed, 01 Jul 2015 15:00:00 CDT -05:00

在我编辑之后

  Rfq Load (0.2ms)  SELECT  "rfqs".* FROM "rfqs"  ORDER BY "rfqs"."id" DESC LIMIT 1
 => Tue, 30 Jun 2015 00:00:00 CDT -05:00

Answer 1

您的问题是，在使用表单中的值更新due属性之前，您正在更改该属性。

你应该这样做：

def update
  @rfq.owner = current_user.email
  @rfq.attributes = rfq_params
  @rfq.due = @rfq.due.change(hour: 15)
  respond_to do |format|
    if @rfq.save
      format.html { redirect_to @rfq, notice: 'Rfq was successfully updated.' }
      format.json { render :show, status: :ok, location: @rfq }
    else
      format.html { render :edit }
      format.json { render json: @rfq.errors, status: :unprocessable_entity }
    end
  end
end