"Go Web Development Revel+mgo" The 6th chapter realizes the message board function

This is a creation in Article, where the information may have evolved or changed.

Demo Address http://gblog-revel.herokuapp.com/

1. Implement Message Board

We did a simple design in the previous chapter, pick on the message form has, then .....
First, create a new message.go content under App/models:

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{messcol Lection: = Dao.session.DB (DbName). C (messagecollection) Mess: = []message{}query: = Messcollection.find (Bson. m{}). Sort ("-cdate") query. All (&mess) return mess}

Take a look, more similar to our comment.go.
Create a new wmessage.go content under App/controllers:

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 being 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) }

Well, it's very familiar.
OK, to add the route, add it in Conf/routes:

POST    /putmessage                 wmessage.putup

OK, let's show it.
The Message () method in App.go is modified to:

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)}

The views/app/message.html was last modified to:

{{set.} "title" "Message-gblog"}}{{set. "Mess" "Active"}}{{template "header.html".}}         <div class= "Content" > <div class= "Comment-nav" > <div class= "comment-title" > Message board <span style= "Float:right" title= "Total Messages" >[{{len .messages}}]</span> </div> <div class= "Comment-cell" > <div class= "Comment-inputbox" > <form action= "/putmessage" method= "Pos T "> <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> Personal Home Page {{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 $index 2}} <div class= "Comment-cell" > <pre ><code><span class= "Func-col or ">func</span><span class=" Func-name "> Usermessage</span><span class=" PLN "> () </ Span><span class= "PLN" >{</span><span class= "pln-w" > </span><span class= "Func-color" >var</span><span class= "Pln-w" > </span><span class= "PLN" >email </span><span class= "Func-type" >string </span><span class= "PLN" >=</span><span class= "PLN" > </span ><span class= "FuNc-str ">" {{$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" > "{{$message. Content}} "</span><span class=" PLN ">;</span><span class=" PLN ">}</span><span class = "Pln-w" ></code></pre> </div> {else} <div class= "Comment-cell" > &lt ;p re style= "background: #2d2d2d;" ><code><span class= "Func-color" >func</span><span class= "Func-name" > UserMessage</ Span><span class= "Pln-w" > () </span><span class= "pln-w" >{</span><span class= "Pln-w" > </span><span class= "Func-color" &Gt;var</span><span class= "Pln-w" > </span><span class= "pln-w" >email </span><span class= "Func-type" >string </span><span class= "pln-w" >=</span><span class= "pln-w" > </ Span><span class= "Func-str" > "{{$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" .}} 

Yes, finished? Are you done? Take a look at this piece of code:

{{if Mo $index 2}}

Well, we've added a custom method, remember what the last one did? Open App/init.go added in the Func init method:

Revel. templatefuncs["Mo"] = func (A, b int) bool {return a%b==0}

This time we really finished, look at the effect:



Source Address:Https://github.com/joveth/GBlog

AC qq:158325682