So I'm making a simple forum app and I have 2 collections:
User
_id:60ccb13a21d65f0c7c4c0690
username: testuser
name: test
And Createpost
_id:60d80b1305dcc535c4bf111a
postTitle: "test post"
postText: "aaaaa"
postUsername: "testuser"
If I wanted to get data of testuser from User displayed on his forum post, what would be the best way to do that? This is what I've tried so far:
router.get('/forum', async (req,res)=>res.render('forum', {newPost: await Createpost.find().sort({ date: 'desc'}),
postUser: Createpost.aggregate([{$lookup: { from: "User", localField: "postUsername", foreignField: "username", as: "user"}}])}));
Then I want to get the name field from the newly joined documents in EJS like here:
<% newPost.forEach(newPost => { %>
Posted by: <%= newPost.postUsername %> - Name: <%= postUser.name %>
<%= newPost.postText %>
<% }%>
But when I do this, it doesn't say anything, or if I only put postUser, it says "[object Object]". Any help would be much appreciated.
You are missing await
in your postUser
query. So the return of this query can be a promise
. I edited it a bit and just made 1 query to get all the data you needed.
router.get('/forum', async (req, res) => {
const newPosts = await Createpost.aggregate([
{
$lookup: {
from: 'users',
localField: 'postUsername',
foreignField: 'username',
as: 'user'
}
},
{
$unwind: '$user'
}
]);
res.render('forum', {
newPosts
});
});
newPosts
will have a value like this:
[{
"_id" : "60d80b1305dcc535c4bf111a",
"postTitle" : "test post",
"postText" : "aaaaa",
"postUsername" : "testuser",
"user" : {
"_id" : ObjectId("60ccb13a21d65f0c7c4c0690"),
"username" : "testuser",
"name" : "test"
}
},...]
Ejs file should be like here:
<% newPosts.forEach(newPost => { %>
Posted by: <%= newPost.postUsername %> - Name: <%= newPost.user.name %>
<%= newPost.postText %>
<% }%>
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