Querying document IDs in Mongodb using PHP library
My new job at IBM is as a development support person. That means I spend most of my time dealing with databases. In my workflow, I spent some time on MongoDB, which is a document database. But I encountered some problems in retrieving records by ID. The following code is the final version, and I can directly refer to it when I encounter similar problems in the future. If you also need it, I hope the following will be helpful to you.
MongoDB and IDs
When I insert data into a collection, I don't set the _id field; if it's empty, MongoDB will automatically generate an ID to use, which is great for me. However, this becomes a problem when I use the identifier generated by MongoDB.
If I use db.posts.find() to retrieve my data (my collection is called posts), the data looks like this:
{ "_id" : ObjectId("575038831661d710f04111c1"), ...
Therefore, if I want to retrieve data by ID, I also need to include the ObjectId method to access the ID.
Using PHP Libraries
When I did this with PHP , I didn't find a good example using this new PHP library (but it's a really nice library). In previous versions, this library used a class called MongoID. I know that's not what I want - but I did check the documentation for this class. So if you can only find examples in previous code, it's still useful to know this method.
To pass an ID to MongoDB using this PHP library, you need to construct a MongoDB\BSON\ObjectID instance. The following example retrieves a document in a blog by its Id.
$post = $posts->findOne(["_id" => new MongoDB\BSON\ObjectID($id)]);
Then, I’m going to update this record – this blog post also has embedded comments in this record, so I’ll add an array to the comments collection in this record with the _id I got, as follows:
$result = $posts->updateOne(
["_id" => new MongoDB\BSON\ObjectID($id)],
['$push' => [
"comments" => $new_comment_data
]
]);
Finally, I hope this article will be helpful to everyone.
Original text: Finding Mongo Document IDs Using the PHP Library
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