user.js

//jshint esversion:6
const express = require("express"); 
const router = express.Router();
const mongoose = require('mongoose');
const requireLogin=require("../middleware/requireLogin");
const Recipe=mongoose.model("Recipe");
const User = mongoose.model("User");

router.get('/user/:id',requireLogin,(req,res)=>{      // here we get the "id" of the user along with url , whose profile we want to see
    User.findOne({_id:req.params.id})                   // query to find the user using "id" in "User" db
    .select("-password")                                   // select all the field except password
    .then(user=>{
         Recipe.find({postedBy:req.params.id})                  // if user exist then find the recipes of that user  // or query for find the recipes of that user
         .populate("postedBy","_id name")
         .exec((err,recipes)=>{
             if(err){
                 return res.status(422).json({error:err})
             }
             res.json({user,recipes})
         })
    }).catch(err=>{
        return res.status(404).json({error:"User not found"})
    })
})

router.put('/follow',requireLogin,(req,res)=>{
    User.findByIdAndUpdate(req.body.followId,{
        $push:{followers:req.user._id}
    },{
        new:true
    },(err,result)=>{
        if(err){
            return res.status(422).json({error:err})
        }
      User.findByIdAndUpdate(req.user._id,{
          $push:{following:req.body.followId}
          
      },{new:true}).select("-password").then(result=>{
          res.json(result)
      }).catch(err=>{
          return res.status(422).json({error:err})
      })

    }
    )
})

router.put('/unfollow',requireLogin,(req,res)=>{
    User.findByIdAndUpdate(req.body.unfollowId,{
        $pull:{followers:req.user._id}
    },{
        new:true
    },(err,result)=>{
        if(err){
            return res.status(422).json({error:err})
        }
      User.findByIdAndUpdate(req.user._id,{
          $pull:{following:req.body.unfollowId}
          
      },{new:true}).select("-password").then(result=>{
          res.json(result)
      }).catch(err=>{
          return res.status(422).json({error:err})
      })

    }
    )
})

router.post('/search-users',(req,res)=>{
    let userPattern = new RegExp("^"+req.body.query)
    User.find({name:{$regex:userPattern}})
    .select("_id name")
    .then(user=>{
        res.json({user})
    }).catch(err=>{
        console.log(err)
    })

})

router.put('/updatepic',requireLogin,(req,res)=>{
    User.findByIdAndUpdate(req.user._id,{$set:{pic:req.body.pic}},{new:true},
        (err,result)=>{
         if(err){
             return res.status(422).json({error:"pic cannot post"})
         }
         res.json(result)
    })
})
module.exports=router;