example of controller file

gistfile1.txt

var UserModel = require("../model/user");
var Pet = require("../model/pet");

exports.index = function(req,res){

    Pet.find(
        {
            'users' : {
                $in:[req.user.id]
            }
        },
        function(error,pets){
            res.render('pets/index',{pets:pets, title:"Pedgree" })
        }
    );

};

exports.create = function(req,res){
    Pet.find(
        {
            'users' : {
                $in:[req.user.id]
            }
        },
        function(error,pets){

            var male=[],female=[];
            for(var i=0; i<pets.length; i++){
                if(pets[i].gender == "male")
                    male.push(pets[i])
                else
                    female.push(pets[i])
            }
            res.render('pets/create',{title:"Pedgree",pets:pets, males:male, females:female})
        }
    );
};

exports.newdata = function(req, res){
	UserModel.findOne(req.user.id,function(err,user){
        Pet.findOneAndUpdate(
            {
                name:req.body.name,
                gender:req.body.gender
            },{},{
                upsert:true
            },function(err,pet){
                if(err)
                    console.log(err);
                pet.gender = req.body.gender;
                pet.father = req.body.father;
                pet.mother = req.body.mother;
                pet.users.push(req.user.id);
                pet.save(function(err){
                    res.redirect('/pets');
                })
            }
        );
	});
};

exports.update = function(req,res){
    Pet.findById(req['params']['id'], function(err,pet){
        pet.name = req.body.name;
        pet.save(function(err){
            res.redirect('/pets');
        });
    });
};

exports.edit = function(req,res){
    Pet.findById(req['params']['id'], function(err,pet){
        res.render('pets/edit',{title:"Pedgree", pet:pet})

    });
};

exports.show = function(req,res){
    Pet.findById(req.params.id, function(err,pet){
        if(pet.gender == "male"){
            Pet.find(
                {
                    "father":pet.id+""
                },{},function(err,children){
                res.render('pets/show',{title:"Pedgree", pet:pet, children:children})
            });
        }else{
            Pet.find(
                {
                    "mother":pet.id+""
                },{},function(err,children){
                res.render('pets/show',{title:"Pedgree", pet:pet, children:children})
            });
        }
    });
};