I have two collections users and uploads. The user collection shows details about the users that have registered to the app. It contains details about the user such as name, userid and following which is an array. The following array contains list of people that the user is following as shown here.
The uploads collection has the posts that are made by the users. Each document in the uploads collection has details such as the postid, post and name of the user who posted it as shown here.
I want to get only the uploads made by the users whom they are following.
For example, Sally follows three people Sam, Thomas and Ellie. I want Sally to get only the uploads that
are made by either of these three people from the uploads collection. Any help would be appreciated. Thank You
I think this might be what you're looking for. You could fetch the users' following array and then use that array to fetch uploads containing people from the following. As a sidenote I'd recommend the userId instead of the name of the user as these might not be unique.
Related
I am currently developing a ToDo app with Flutter and Firebase. The initial situation is as follows:
1. the user has to log in when he wants to create ToDos, i.e. the ToDos would have to be saved best under the UID, right?
2. a user can create multiple lists/categories, for this I also thought about the structure and came up with 2 ideas.
First idea:
I have 2 collections, one with the UserID and all todos and one with the UserID and all categories.
todo ->
title,
createdAt,
done,
category, (link to the second collection with the categories)
...
category ->
name,
icon,
...
Second idea:
I create a single collection per user, the first field is then an array with the name of the category, and in this array are all ToDos.
Unfortunately, I am a complete beginner in Firestore and therefore I am not sure if any of my suggestions would make sense. I hope that the initial situation is well described, otherwise you can still ask questions.
Thank you!
Edit: I just saw a video and I had another idea to create a collection with the UID. This contains all categories as documents and the categories have a subcollection with all Todos.
I am using firestore for creating a food blog where users can upload posts and like it.
Call it facebook for food.
Below I will give you summary of 2 firestore database collections which are going to be used in my question.
First is Users - where the document name is based on UID and it stores information like, username/emailID
Second is Posts - where the document name is based on UID, however in the structure of the collection
It has a column named as "Likes" which is an array object. This stores 2 values : 1. Name of the person who liked the post and 2. UID of the person who liked the post.
Please find the structure of LIKES column in posts document below :
I am trying to add more validations to the likes part of the document.
However, from postman it is possible to change the name of the person who is liking the post.
The logic of the restrictions has to be on 2 things.
LIKES - UID should be present in my users collection. Also, UID in LIKES column shouldn't be changeable.
LIKES - Name should not be allowed to be changed.
I tried a of way of doing it but it doesnt work :
exists(/databases/$(database)/documents/users/$(request.resource.data.likes[request.resource.data.likes.size() -1].userId))
What it does is checks the last UID of person liking that document. However, in this scenario if there are more than 1 Likes, the name/uid could be altered for the ones which were present earlier.
Not a very efficient way.
Also, Loops dont work in rules so I cant loop it up to get it.
Any help would be really appreciated.
Please let me know if there are any more snippets which would be required.
I'd like to check if the user liking the post is already present in our users cloud Firestore.
There are two different collections here, need to check if one's reference is present in another.
Users collection has user details - UID/Name/Email
Posts collection has details : Post Text / Post Likes / Post Comments
Where Likes is an Map which has userId of person who has liked the image and userName.
From backend its possible to exploit the posts collection and enter malicious value in post documents.
I am trying to achieve this for ON UPDATE condition : To check the user liking post exists in users collection.
------ Tried Below So far but it doesnt work --------------------
match /posts/items/{document}
allow update: if exists(/database/$(database)/documents/users/$(request.resource.data.likes.userId));
What I want is to check if the users liking are already existing or not.
This doesnt work because the likes column is an array and can have multiple objects.
Any help would be great.
I'm building a simple application where posts appear on a user's home page and he can like or unlike them.
first when there were no users in the applications, I made a simple boolean field "liked", as shown in the figure, to determine if a post is liked or un-liked. However, when I started working with users, I find it hard to find the perfect structure for the likes field.
In Firestore, I added a field named "likedBy" for each post, which contains a map with a key of each user's id and a boolean to determine if the user liked the post or not.
I don't know if this structure is suitable or not, and if not, is there a better way to reach my goal?
The likedBy field is enough to cover most use cases.
Just store in likedBy an array of all users who liked the post by user ID. When a user likes - add the user ID to the array and remove it upon unlike.
That means you can also remove the likes and liked field as you can get it from reading the likedBy array.
I would recommend going one step further and save more than the User ID. You could also save the User displayName and photoUrl. That way, you don't need to read ($$$$money$$$$) the documents of every Users who liked Posts in order to display their name and/or avatar.
I am working in a small project that uses Firestore database as a backend. I explain about the database so it is understood what I need:
Basically I have a collection that contains a list of documents where each one of them represent a game. For each game I have the name, cover image, info, category, etc.
I also have a collection of the users, where I have the specific UID for each user (retrieved from the auth section), email, etc.
What I want now is to save the score that some user may have in some of these games, as well as the favorite games that the user could save. What I don't get to understand is how to create the connection between the users and the games. For example, I thought that I should save the users score creating a collection within each document(game) in the first collection that mentioned. But when I create this collection with ID "scores" it asks me for the first document where I have to facilitate an ID (if not automatic) and then I don't know how to proceed.
I have read also that I would have to create additional collections in the root folder like "favorites" or "scores" specifying the UID of the user but, how do I connect the user UID, the score, and game which the user got that score from?
I hope I explained myself properly. Thanks.
Firstly, I agree with Doug's comment above. The Firestore tutorial videos are a great resource!
In terms of connecting data to your user, you have some options. You can either:
Create sub-collections under each user. Such as /users/{user_id}/favorites. Favorites could be a sub-collection or an array of game_ids depending on your use case.
Store a userID field in the documents in a top level "scores" or "favorites" collection. Then you can query for scores in the /scores collection by adding a where userID == {user_id} clause to your query of the /scores collection.