Question

我想使用相同的方法制作PDF和Excel报告代码，并且只想传递参数一次，但是它显示错误

NoMethodError（未定义的方法`[]＆＃39;对于nil：NilClass）。

控制器代码 -

def print_application_report
      @from = params[:salary][:from_date]
      @to = params[:salary][:to_date]
      @company = params[:employee][:company_id] 
      @company_location = params[:employee][:company_location_id] 
      @department = params[:employee][:department_id] 
      @employees = Employee.where(company_id: @company.to_i,company_location_id: @company_location.to_i,department_id: @department).pluck(:id)
      @travel_requests = TravelRequest.where(application_date:  @from.to_date..@to.to_date,employee_id: @employees)
      respond_to do |format|
      format.js
      format.xls {render template: 'travel_requests/application_datewise_report_xls.xls.erb'}
      format.html
      format.pdf do
        render pdf: 'application_datewise_report_pdf',
              layout: 'pdf.html',
              orientation: 'Landscape',
              template: 'travel_requests/application_datewise_report_pdf.pdf.erb',
              # show_as_html: params[:debug].present?,
              :page_height      => 1000,
              :dpi              => '300',
              :margin           => {:top    => 10, # default 10 (mm)
                            :bottom => 10,
                            :left   => 20,
                            :right  => 20},
              :show_as_html => params[:debug].present?
          end
        end
  end

Answer 1

没有实际的错误，我在这里猜测。你发送params为：

print_application_report_travel_requests_path(from_date: params[:salary][:from_date],to_date: params[:salary][:to_date], company_id: params[:employee][:company_id]....

此处参数from_date的值为params[:salary][:from_date]，但您直接发送参数，未包含在salary密钥中。所以你的所有参数都可以直接在params哈希中使用。

你可以尝试这样改变。

@from = params[:from_date]
@to = params[:to_date]
@company = params[:company_id] 
@company_location = params[:company_location_id] 
@department = params[:department_id]

Answer 2

您可以使用三元运算符检查控制器中的状况，并检查是否存在params[:salary]和params[:employee]，

<强>控制器：

def print_application_report
      @from = params[:salary] ? params[:salary][:from_date] : params[:from_date] 
      @to = params[:salary] ? params[:salary][:to_date] : params[:to_date]
      @company = params[:employee] ? params[:employee][:company_id] : params[:company_id] 
      @company_location = params[:employee] ?  params[:employee][:company_location_id] :  params[:company_location_id] 
      @department = params[:employee] ?  params[:employee][:department_id] : params[:department_id] 
      @employees = Employee.where(company_id: @company.to_i,company_location_id: @company_location.to_i,department_id: @department).pluck(:id)
      @travel_requests = TravelRequest.where(application_date:  @from.to_date..@to.to_date,employee_id: @employees)
      respond_to do |format|
      format.js
      format.xls {render template: 'travel_requests/application_datewise_report_xls.xls.erb'}
      format.html
      format.pdf do
        render pdf: 'application_datewise_report_pdf',
              layout: 'pdf.html',
              orientation: 'Landscape',
              template: 'travel_requests/application_datewise_report_pdf.pdf.erb',
              # show_as_html: params[:debug].present?,
              :page_height      => 1000,
              :dpi              => '300',
              :margin           => {:top    => 10, # default 10 (mm)
                            :bottom => 10,
                            :left   => 20,
                            :right  => 20},
              :show_as_html => params[:debug].present?
          end
        end
  end

<强>解释

我所做的改变是，

<强> @from = params[:salary]

要，

<强> @from = params[:salary] ? params[:salary][:from_date] : params[:from_date]

params[:salary] ? params[:salary][:from_date] : params[:from_date]的含义是，

如果有params [：salary]，那么请params[:salary][:from_date]，如果params[:salary]不存在，那么请params[:from_date]

这一行也可以写成，

if params[:salary]
    @from = params[:salary][:from_date]
else
    @from = params[:from_date]
end

如何在Ruby On Rails中调用相同的方法

2 个答案: