Arindam Sankar Das’ Post

Transcript

Hello hello there if you experienced a cut in the video don't worry there was a slight error slight error complication which I encountered. So don't worry I solved it and now I'll introduce on how you can update properties in an embedded document. Man, it's raining heavily at night. I will give. I don't know how the weather is in your cities, but it's raining very heavily right here. So let me clean this one real quick. And here, as usual, I want to check if the data. It's being fetched OK In the last video you saw, we deleted most of the documents. OK, most of the time we only have the flex and the text with awesome. But what I want is that I want to update this data. And I can update. I want to update this data with Alice and I'm awesome. The one thing one the long procedure which I can take is that I can insert a new document and pop the existing one right? But it will very much lengthy process. So it would be better if I can just update them directly. So first of all I will have to retrieve the data I want to retrieve this data. So first of all, let's go to ID 7. OK, I'll grab the author, not the author. Actually I want to grab the specific data. OK, remember you you will have multiple, you will have multiple documents, nested documents in your comments. OK, so you will have to grab the specific command you want to update. So for that you will have to use. The dot If you check out my previous videos I'll I showed you how you can grab a specific data depending on the embedded document property. So what we have to do that right here we have to do comments. Comments dot and what we have in the name I don't think it's author, I think it's user right? And the user we have right now which is set to flex. So what I want to do I want to set the data. Commands user to Alice. OK, I want to set the comments dot user to Alice. And. Let's check if you can insert multiple data at once. We want to check comments dot, dollar sign and. Text. Let me just. I'm just zooming out so that I can complete the command and then I'll zoom in for you to understand better. OK then the text which I want to be. I am also. OK, OK, it just worked. Let's check if you have updated the data or not. So let's find that. OK, now we have done that. OK, So what we were doing and let me zoom it a bit. OK, So what we are doing, we are grabbing the ID and in that ID I want to grab the document which has the username of flex. We can have multiple. Let's say we have Alice, we have me or in them and we can also have let's say. Aman OK, we have so many people. We want to update this very specific person, which is Alice. OK, we want to update her name to let's say Shrivastav. We want to update that Alice to Srivastav, the username. For that we have to grab that specific user with the dot. Dot syntax comments user which will put Alice. But in this case we have flex and we said that and then we use the set operator and using the operator we want to grab the we want to update that user using the dollar. This is the syntax of how we can update the data for embedded documents. And we also want to update multiple things so we are also giving a comma and then we want to update the next thing we want to update which is the text and I have given the text to Mayerson and that's how we update that data. In this way you can read, update, delete files in MongoDB. With this I have completed the basic knowledge of MongoDB and how you can use it. I have also provided more more advanced concepts as well along the way, so. That's a bus. That's a plus point. But I won't be further going into MongoDB right now because I'm working on Express and you can also say I'm working a bit on Linux whose videos will be coming soon. So till then, if you like my video, do give me a like on LinkedIn. Comment down if you have any confusion and till then bye bye.