【Go web開發之revel+mgo】第6章 實現留言板功能

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

示範地址   http://gblog-revel.herokuapp.com/

1.實現留言板

我們在上一章做了簡單的設計，挑就留言的表單有了，那麼。。。。。
首先，在app/models下建立message.go 內容：

package modelsimport ("github.com/revel/revel""labix.org/v2/mgo/bson""time")type Message struct{Email stringQQ stringUrl stringCDate time.TimeContent string}func (message *Message) Validate(v *revel.Validation) {v.Check(message.Email,revel.Required{},revel.MaxSize{50},)v.Email(message.Email)v.Check(message.QQ,revel.MaxSize{20},)v.Check(message.Url,revel.MaxSize{200},)v.Check(message.Content,revel.Required{},revel.MinSize{1},revel.MaxSize{1000},)}func (dao *Dao) InsertMessage(message *Message) error {messCollection := dao.session.DB(DbName).C(MessageCollection)//set the timemessage.CDate = time.Now();err := messCollection.Insert(message)if err != nil {revel.WARN.Printf("Unable to save Message: %v error %v", message, err)}return err}func (dao *Dao) FindAllMessages() []Message{messCollection := dao.session.DB(DbName).C(MessageCollection)mess := []Message{}query := messCollection.Find(bson.M{}).Sort("-cdate")query.All(&mess)return mess}

看一看，跟我們的comment.go更加的相似。
在app/controllers下建立wmessage.go 內容：

package controllersimport ("github.com/revel/revel""GBlog/app/models""strings""fmt")type WMessage struct {App}func (c WMessage) Putup(message *models.Message) revel.Result {message.Email = strings.TrimSpace(message.Email);message.Url = strings.TrimSpace(message.Url);message.Content = strings.TrimSpace(message.Content);message.QQ = strings.TrimSpace(message.QQ);message.Validate(c.Validation)fmt.Println(c.Validation)if c.Validation.HasErrors() {c.Validation.Keep()c.FlashParams()c.Flash.Error("Errs:The email and the content should not be null,or the maxsize of email is 50.")return c.Redirect(App.Message)}dao, err := models.NewDao()if err != nil {c.Response.Status = 500return c.RenderError(err)}defer dao.Close()err = dao.InsertMessage(message)if(err!=nil){c.Response.Status = 500return c.RenderError(err)}return c.Redirect(App.Message)}

恩，很熟系吧。
好，來添加路由，在conf/routes裡添加：

POST    /putmessage                 WMessage.Putup

ok了嗎，下面我們來顯示它。
在app.go的 Message（）方法修改為：

func (c App) Message() revel.Result {dao, err := models.NewDao()if err != nil {c.Response.Status = 500return c.RenderError(err)}defer dao.Close()//dao := models.NewDao(c.MongoSession)messages := dao.FindAllMessages()return c.Render(messages)}

將Views/App/Message.html最後修改為：

{{set . "title" "Message - GBlog"}}{{set . "mess" "active" }}{{template "header.html" .}}<div class="content">    <div class="comment-nav">       <div class="comment-title">         留言板         <span style="float:right" title="Total messages">[{{len .messages}}]</span>       </div>       <div class="comment-cell">         <div class="comment-inputbox">            <form action="/putmessage" method="post" >                  <ul class="comment-input-infor">                    {{with $field := field "message.Email" .}}                    <li>                      EMAIL                      <input type="email"  id="{{$field.Id}}" name="{{$field.Name}}" class="form-control " required value="{{if $field.Error}}{{$field.Error}}{{else}}{{$field.Value}}{{end}}"/>                    </li>                     {{end}}                    <li>                      QQ                      {{with $field := field "message.QQ" .}}                      <input type="text"  id="{{$field.Id}}" name="{{$field.Name}}" class="form-control" value="{{if $field.Error}}{{$field.Error}}{{else}}{{$field.Value}}{{end}}" />                      {{end}}                    </li>                    <li>                      個人首頁                      {{with $field := field "message.Url" .}}                      <input type="text"  id="{{$field.Id}}" name="{{$field.Name}}" class="form-control" placeholder="Don't with http://  " value="{{if $field.Error}}{{$field.Error}}{{else}}{{$field.Value}}{{end}}"/>                      {{end}}                    </li>                  </ul>                  <div class="comment-input-text">                    MESSAGE                    <div>                      {{with $field := field "message.Content" .}}                      <textarea class="form-control ctextarea" id="{{$field.Id}}" name="{{$field.Name}}" required>{{if $field.Error}}{{$field.Error}}{{else}}{{$field.Value}}{{end}}</textarea>                      {{end}}                    </div>                  </div>                  <button type="submit" class="btn btn-success comment-input-text-btn">SUBMIT</button>            </form>         </div>       </div>       {{if .messages}}       {{range $index,$message:=.messages}}       {{if mo $index 2}}       <div class="comment-cell">         <pre ><code><span class="func-color">func</span><span class="func-name"> UserMessage</span><span class="pln">() </span><span class="pln">{</span><span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln">email </span><span class="func-type">string </span><span class="pln">=</span><span class="pln"> </span><span class="func-str">"{{$message.Email}}"</span><span class="pln">;</span>{{if $message.QQ}}<span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln">QQ </span><span class="pln">=</span><span class="pln-w"> </span><span class="func-str" >{{$message.QQ}}</span><span class="pln">;</span>{{end}}{{if $message.Url}}<span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln">url </span><span class="pln">=</span><span class="pln-w"> </span><a href="http://{{$message.Url}}" class="func-str" target="_blank">http://{{$message.Url}}</a><span class="pln">;</span>{{end}}<span class="pln-w">    </span><span class="pln">Date </span><span class="func-color">:=</span><span class="pln-w"> </span><span class="func-str">"{{$message.CDate.Format "2006-01-02 15:04"}}"</span><span class="pln">;</span><span class="pln-w">    </span><span class="func-color">var </span><span class="pln">Message</span><span class="pln-w"> </span><span class="pln">=</span><span class="pln-w"> </span><span class="func-str">"{{$message.Content}}"</span><span class="pln">;</span><span class="pln">}</span><span class="pln-w"></code></pre>       </div>       {{else}}       <div class="comment-cell">         <pre style="background:#2d2d2d;"><code><span class="func-color">func</span><span class="func-name"> UserMessage</span><span class="pln-w">() </span><span class="pln-w">{</span><span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln-w">email </span><span class="func-type">string </span><span class="pln-w">=</span><span class="pln-w"> </span><span class="func-str">"{{$message.Email}}"</span><span class="pln-w">;</span>{{if $message.QQ}}<span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln-w">QQ </span><span class="pln-w">=</span><span class="pln-w"> </span><span class="func-str" >{{$message.QQ}}</span><span class="pln-w">;</span>{{end}}{{if $message.Url}}<span class="pln-w">    </span><span class="func-color">var</span><span class="pln-w"> </span><span class="pln-w">url </span><span class="pln-w">=</span><span class="pln-w"> </span><a href="http://{{$message.Url}}" class="func-str" target="_blank">http://{{$message.Url}}</a><span class="pln-w">;</span>{{end}}<span class="pln-w">    </span><span class="pln-w">Date </span><span class="func-color">:=</span><span class="pln-w"> </span><span class="func-str">"{{$message.CDate.Format "2006-01-02 15:04"}}"</span><span class="pln-w">;</span><span class="pln-w">    </span><span class="func-color">var </span><span class="pln-w">Message</span><span class="pln-w"> </span><span class="pln-w">=</span><span class="pln-w"> </span><span class="func-str">"{{$message.Content}}"</span><span class="pln-w">;</span><span class="pln-w">}</span><span class="pln-w"></code></pre>       </div>       {{end}}       {{end}}       {{end}}  </div></div>{{template "footer.html" .}}

呀，完成了把？完成了嗎？看看其中的這段代碼：

 {{if mo $index 2}}

恩，我們又加了一個自訂的方法，還記得上一個怎麼做的嗎？開啟app/init.go 在func init方法裡添加：

revel.TemplateFuncs["mo"] = func(a, b int) bool { return a%b==0 }

這一次我們真的完成了，看效果：



源碼地址：https://github.com/joveth/GBlog

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