batazor/go-auth

package user

import (
    "errors"
    "net/http"

    "github.com/micro-company/go-auth/db/mongodb"
    "github.com/micro-company/go-auth/models/user"
    "github.com/micro-company/go-auth/utils"
    "gopkg.in/mgo.v2/bson"
)

func CheckUniqueUser(w http.ResponseWriter, user userModel.User) bool {
    count, err := mongodb.Session.Database("auth").Collection(userModel.CollectionUser).Count(nil, bson.M{"mail": user.Email})
    if err != nil {
        utils.Error(w, errors.New(`"`+err.Error()+`"`))
        return true
    }

    if count > 0 {
        w.WriteHeader(http.StatusBadRequest)
        utils.Error(w, errors.New(`{"mail": "need unique mail"}`))
        return true
    }

    return false
}