like/dislike button with api call not working using vue an mongoDB - vue.js

Question

I am learning vuejs and i am working on my first project which is a social network, and i want to implement a like button that call the api to add a like or remove it if the user has already liked it. It does work in my backend but i can't make it work in the front.
I need to send the userId and add or remove the like when i click on the button
This is the data
data() {
return {
post: {
file: "",
content: "",
likes: 0,
},
showModal: false,
showModifyPost: false,
user: {
firstname: "",
lastname: "",
_id: "",
},
};
},
the last method i tried
likePost(id) {
axios
.post('http://127.0.0.1:3000/api/post/like/' + id, {
headers: {
Authorization: "Bearer " + localStorage.getItem("token"),
},
})
.then(() => {
console.log("response", response);
this.user._id = response.data._id;
if(post.usersLiked == user._id) {
this.post.likes += 0
} else if (post.usersLiked != user._id) {
this.post.likes += 1
};
})
.catch((error) => console.log(error));
}
and this is the model
const postSchema = mongoose.Schema({
userId: { type: String, required: true, ref: "User" },
content: { type: String, required: true, trim: true },
imageUrl: { type: String, trim: true },
likes: { type: Number, default: 0 },
usersLiked: [{ type: String, ref: "User" }],
firstname: {type: String, required: true, trim: true },
lastname: {type: String, required: true, trim: true },
created_at: { type: Date},
updated_at: { type: Date }
});
Any idea what is wrong ? Thank you !

Answer 1

.then(() => { // you missed value response from Promise here
this.user._id = response.data._id;
if(post.usersLiked == user._id)
})
Do you mean this.post.usersLiked === user._id I suppose, so post within your data options should be
post: {
file: "",
content: "",
likes: 0,
usersLiked: false,
// something else reflect to your post schema
},
i want to implement a like button that call the api to add a like or remove it if the user has already liked it
By saying that you just need a simple boolean value to do this
likePost(id) {
axios
.post('http://127.0.0.1:3000/api/post/like/' + id, {
headers: {
Authorization: "Bearer " + localStorage.getItem("token"),
},
})
.then((response) => {
// Just need to toggle state
this.$set(this.post, 'usersLiked', this.post.usersLiked !== response?.data?._id)
})
.catch((error) => console.log(error));
}

Answer 2

Found the answer, i changed the axios method to this
likePost(id) {
let userId = localStorage.getItem('userId');
axios
.post('http://127.0.0.1:3000/api/post/like/' + id, { userId }, {
headers: {
Authorization: "Bearer " + localStorage.getItem("token"),
},
})
.then((response) => {
console.log(response.data);
this.getAllPost();
})
.catch((error) => console.log(error));
}
i also made a few changes to the data
data() {
return {
posts: [],
post: {
file: "",
content: "",
},
showModal: false,
showModifyPost: false,
user: {
firstname: "",
lastname: "",
_id: "",
},
};
},
and i also made some changes on the controller
exports.ratePost = (req, res, next) => {
console.log(req.body.userId)
//using findOne function to find the post
Post.findOne({ _id: req.params.id }).then(post => {
if (!post.usersLiked.includes(req.body.userId)) {
// making a object with $inc and $push methods to add a like and to add the user's id
let toChange = {
$inc: { likes: +1 },
$push: { usersLiked: req.body.userId },
};
// we update the result for the like
Post.updateOne({ _id: req.params.id }, toChange)
// then we send the result and the message
.then(post =>
res
.status(200)
.json(
{ message: "Liked !", data: post }
)
)
.catch(error => res.status(400).json({ error }));
} else if (post.usersLiked.includes(req.body.userId)) {
// using the updateOne function to update the result
Post.updateOne(
{ _id: req.params.id },
// we use a pull method to take off a like
{ $pull: { usersLiked: req.body.userId }, $inc: { likes: -1 } }
)
.then(post => {
// then we send the result and the message
res
.status(200)
.json(
{ message: "Post unliked", data: post }
);
})
.catch(error => res.status(400).json({ error }));
}
});
};