Create, Read, Update, and Delete

[github-learning-lab]

Create, Read, Update, and Delete

[FaisalAfroz]

5f6aab24c4bf8d504d6e826c

[github-learning-lab]

READ: User.findById

Great, your user has an id of 5f6aab24c4bf8d504d6e826c. This is what we will use in place of :id, as we make the other requests. find the "READ" route in our server file, and replace it with this code:

// READ
.get((req,res)=>{
  User.findById(req.params.id,(err,data)=>{
    if (err){
      res.json({
        success: false,
        message: err
      })
    } else if (!data){
      res.json({
        success: false,
        message: "Not Found"
      })
    } else {
      res.json({
        success: true,
        data: data
      })
    }
  })
})

Testing

Let's find the document for the user we just created. Make a "get" request in postman to this url: http://localhost:8000/users/5f6aab24c4bf8d504d6e826c. This should return the document with the user's data.

Once you have this working, push your code to GitHub to continue.

[github-learning-lab]

UPDATE: User.findByIdAndUpdate

If you want to update a document in mongoDB, you can do it with the User.findByIdAndUpdate method. This takes three arguments (id, newData, callback). The id is still coming from "req.params", but newData is an object sent through the "req.body". Also, by default the update method will return the unmodified document. We can add an "options" argument before the callback ({new:true}) to make it return the modified document.

Replace the "UPDATE" route with this code:

// UPDATE
.put((req,res)=>{
  User.findByIdAndUpdate(
    req.params.id,
    {
      name:req.body.newData.name,
      email:req.body.newData.email,
      password:req.body.newData.password
    },
    {
      new:true
    },
    (err,data)=>{
      if (err){
        res.json({
          success: false,
          message: err
        })
      } else if (!data){
        res.json({
          success: false,
          message: "Not Found"
        })
      } else {
        res.json({
          success: true,
          data: data
        })
      }
    }
  )
})

Test this out by making a "PUT" request in Postman at the endpoint for our user. Update the password field by putting this json data in the request body:

{
  "newData":{
    "name":"Jim",
    "email":"[email protected]",
    "password":"newPassword"
  }
}

If this worked, you should see the newly modified document as a response.

Push your code to GitHub for the next step.

[github-learning-lab]

Delete Data: findByIdAndDelete

To delete a document, you can use the User.findByIdAndDelete method, which takes an id and callback as arguments.

Replace the "delete" route with this:

// DELETE
.delete((req,res)=>{
  User.findByIdAndDelete(
    req.params.id,
    (err,data)=>{
      if (err){
        res.json({
          success: false,
          message: err
        })
      } else if (!data){
        res.json({
          success: false,
          message: "Not Found"
        })
      } else {
        res.json({
          success: true,
          data: data
        })
      }
    }
  )
})

To test this out, make a "delete" request in Postman to url we have been using.

You can test to make sure this worked by making a "get" request to the same url. It should say that the data could not be found.

Push your code to GitHub to complete this step.

[github-learning-lab]

Awesome! The last thing I want to go over is refactoring our routes to make them easier to maintain.

Click here to learn how.