【Go web开发之revel+mgo】第6章 实现留言板功能
浏览数：31 /
时间：2015年06月10日
演示地址 http://gblog-revel.herokuapp.com/
1.实现留言板
我们在上一章做了简单的设计，挑就留言的表单有了，那么。。。。。
首先，在app/models下新建message.go 内容：
package models
import (
"github.com/revel/revel"
"labix.org/v2/mgo/bson"
"time"
)
type Message struct{
Email string
QQ string
Url string
CDate time.Time
Content 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 time
message.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，跟我们的comment.go更加的相似。
在app/controllers下新建wmessage.go 内容：
package controllers
import (
"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 = 500
return c.RenderError(err)
}
defer dao.Close()
err = dao.InsertMessage(message)
if(err!=nil){
c.Response.Status = 500
return c.RenderError(err)
}
return c.Redirect(App.Message)
}
恩，很熟系吧。
好，来添加路由，在conf/routes里添加：
POST /putmessage WMessage.Putup
ok了吗，下面我们来显示它。
在app.go的 Message（）方法修改为：
func (c App) Message() revel.Result {
dao, err := models.NewDao()
if err != nil {
c.Response.Status = 500
return c.RenderError(err)
}
defer dao.Close()
//dao := models.NewDao(c.MongoSession)
messages := dao.FindAllMessages()
return c.Render(messages)
}将Views/App/Message.html最后修改为：
{{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>
个人主页
{{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？完成了吗？看看其中的这段代码：
{{if mo $index 2}}恩，我们又加了一个自定义的方法，还记得上一个怎么做的吗？
打开app/init.go 在func init方法里添加：
revel.TemplateFuncs["mo"] = func(a, b int) bool { return a%b==0 }这一次我们真的完成了，看效果：
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