inputtypes字段validation失败时如何停止上传图像？

访问Web服务后，如果validation失败，则上传图像。 我需要控制它。 如果validation成功，则应该上传图像。 我已经在由sequelize创build的模型中定义了validation代码。 如果validation成功，如何防止并上传图像？

型号代码是

name : { type : sequelize.STRING, validate : { notEmpty : {msg : 'The Name is required!'} } }, email : { type : sequelize.STRING, validate : { notEmpty : {msg : 'The email field is required!'}, isEmail : {msg : 'The email format is not correct!'} } }, 

上传图片的控制器代码是

 var storage = multer.diskStorage({ destination : function(req,file,cb){ cb(null,'public/uploads/profile/'); }, filename : function(req,file,cb){ if(!file.originalname.match(/\.(png|jpg|jpeg|gif|bmp)$/)){ var err = new Error(); err.code = 'filetype'; return cb(err); }else{ var fileExtention = mime.extension(file.mimetype); var uniqueFileName = uuidv1(); var uniqueImageName = uniqueFileName + '.' + fileExtention; cb(null,uniqueImageName); } } }); var upload = multer({ storage : storage, limits : {fileSize : 10000000} }).single('image'); EmployeeController.prototype.addEmployee = function(req,res){ upload(req,res,function(err){ if(err){ console.log(err); if(err.code === 'LIMIT_FILE_SIZE'){ res.send({msg:'File sizee is too large. Max limit is 10mb!',status:'Failure',response:200,data:[]}); }else if(err.code === 'filetype'){ res.send({msg:'File type is invalid!',status:'Failure',response:200,data:[]}); }else{ res.send({msg:'File was not able to uploaded!',status:'Failure',response:200,data:[]}); } }else{ if(typeof req.file === 'undefined'){ console.log('No Image Found'); var imageName = ''; }else{ console.log('Image Found!'); var imageName = '/public/uploads/profile/'+req.file.filename; } async.waterfall([ function(callback){ var employeeCode = 'EMP1'; var employeeCodeObj = Employee.max('id').then(max => { var maxid = 1; if(max){ maxid = max + 1; } employeeCode = "EMP"+maxid; callback(null,employeeCode); }).catch(err=>{ callback(err,'Failure',500,'Unable to generate employee code!',[]); }); }, function(employeeCode,callback){ var password = randomstring.generate({ length: 8, charset: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%&*' }); callback(null,employeeCode,password); }, function(employeeCode,password,callback){ var params = req.body; var name = Helper.trimInputValue(params.name); var email = Helper.trimInputValue(params.email); var image = imageName; var dob = Helper.trimInputValue(params.dob); Employee.findOrCreate({ where : { email : email, }, defaults : { name : name, email : email, image : image } }).spread(function(employeeData,created){ console.log('Success'); }).catch(sequelize.ValidationError,function(err){ var data = err.errors; var dataErrors = Array(); if(data.length){ for(var key in data){ dataErrors.push({ 'key' : data[key].path, 'msg' : data[key].message }); } } callback('error','Failure',200,dataErrors,[]); }) } ],function(error,status,response,msg,data){ return res.send({msg:msg,status:status,response:response,data:data}); }); } }); };