Question

我是初学者，我想知道在Rails中应该将这样的计算放在哪里以及如何显示它：

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:c="http://java.sun.com/jsp/jstl/core">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet"></link>
<title>Insert title here</title>

</h:head>
<h:body>
    <ui:debug />

     <h:form id="formulaire1">
     <h:inputHidden value="#{listeOdm.n_odm}" />
     <h:inputHidden value="#{listeOdm.operation}" />
     <p:growl id="msgs" showDetail="true"/>
    <h:dataTable  id="basicDT"    var="odm" value="#{listeOdm.listOdm}" binding="#{listeOdm.dataTable}"      >

       <h:column headerText="Etat" id= "bulet">

         <h:panelGroup rendered="#{odm.valide_manag1 eq '2'}">
         <h:graphicImage   library="img" name="if_bullet-green_44189.png" width="24" height="24" style="border-style: none"/>
         </h:panelGroup>
         <h:panelGroup rendered="#{odm.valide_manag1+odm.valide_manag2 eq '1'}">
          <h:graphicImage   library="img" name="orange.gif" width="24" height="24" style="border-style: none"/>
         </h:panelGroup>
          <h:panelGroup rendered="#{odm.valide_manag1+odm.valide_manag2 eq '0'}">
          <h:graphicImage   library="img" name="if_bullet-red_44191.png" width="24" height="24" style="border-style: none"/>
         </h:panelGroup>
         </h:column>
           <h:column headerText="valid">
            <h:outputText value="#{odm.valide_manag1}" />
        </h:column>
        <h:column headerText="Num Odm">
            <h:outputText value="#{odm.num_odm}" />
        </h:column>
        <h:column headerText="Client">
            <h:outputText value="#{odm.client}" />
        </h:column>
        <h:column headerText="Station">
            <h:outputText value="#{odm.station}" />
        </h:column>
         <h:column headerText="Destination">
            <h:outputText value="#{odm.destination}" />
        </h:column>
        <h:column headerText="date dep">
            <h:outputText value="#{odm.date_dep}" pattern="dd/MM/yyyy"/>
        </h:column>
        <h:column headerText="date retour">
            <h:outputText value="#{odm.date_ret}" pattern="dd/MM/yyyy"/>
        </h:column>
        <h:column headerText="Cient">
            <h:outputText value="#{odm.client}" />
        </h:column>
         <h:column headerText="Edit" width="24">

               <h:commandLink    
                    actionListener="#{listeOdm.editOdm}" update=":formulair1:basicDT"   ajax="true">
                    <f:param name="numOdm" value="#{odm.num_odm}"></f:param>
                    <f:param name="operation" value="edit"></f:param>
                    <h:graphicImage   library="img" name="118805-128.png" width="24" height="24" style="border-style: none"/>
                    <!--  <i class="fa fa-envelope"></i> -->

                </h:commandLink>
                <h:commandLink    
                    actionListener="#{listeOdm.printOdm}" update="formulaire1">
                    <f:param name="numOdm" value="#{odm.num_odm}"></f:param>
                    <f:param name="operation" value="edit2"></f:param>
                    <h:graphicImage   library="img" name="Print-2-128.png" width="24" height="24" style="border-style: none"/>
                    <!--  <i class="fa fa-envelope"></i> -->
                </h:commandLink>
        </h:column>

    </h:dataTable>

    </h:form>

</h:body>
</html>

以下是我所指的表格：

@suplement.total_cost = @suplement.number_of_days * @suplement.daily_dosage_in_units * (@suplement.suplement_cost / @suplement.number_of_units)

虽然我只是在视图中尝试此计算，但它正确计算并显示在create_table "suplements", force: :cascade do |t| t.string "name" t.integer "number_of_units" t.integer "daily_dosage_in_units" t.float "suplement_cost" t.float "total_cost" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.integer "user_id" t.integer "number_of_days" end中，但显然这不是我想要的。这是我想要的方式，但它显示除total_cost之外的所有内容：

f.text_area :total_cost

Answer 1

您可以在其类中定义total_attribute，Suplement。这样您就可以访问所有剩余的属性，总数是“计算的”属性：

class Suplement < ApplicationRecord
  def total_cost
    suplement_over_units = suplement_cost / number_of_units
    dosage_per_days = number_of_days * daily_dosage_in_units
    dosage_per_days * suplement_over_units
  end
end

刚刚分配了一些变量，如您的示例所示，它只是访问属性，因为您无法访问@suplement变量：

def total_cost
  number_of_days * daily_dosage_in_units * (suplement_cost / number_of_units)
end

Rails计算逻辑

1 个答案: