Firestore Update Inside Array of object

Question

I have a structure like this and in this I want to update the role of userId '2' to "Admin".

{
  "chats": {
    "chatThreadID": {
      "chatUsers": [
        {
          "userId": 1,
          "role": "Admin"
        },
        {
          "userId": 2,
          "role": "General"
        },
        {
          "userId": 3,
          "role": "General"
        }
      ]
    }
  }
}

I tried doing 'updateData'

"chatUsers": FieldValue.arrayRemove([oldUser.dictionary])

Then

"chatUsers": FieldValue.arrayUnion([updatedUser.dictionary])

This works, but is there any better way to do this?

Jay · Accepted Answer · 2020-08-08 13:33:43Z

2

What you're doing looks correct to me.

If you're looking to update a user with a single write operation, the most common alternative is to not store the users in an array field with their roles, but store the user+roles in a map field:

"chatUserRoles": {
  "1": "Admin",
  "2": "General",
  "3": "General"
}

With this structure, you can update a specific user with dot notation:

"chatUserRoles."+updatedUser.dictionary.userId: updatedUser.dictionary.role

Or as literal text:

"chatUserRoles.1": "General"

edited Aug 8, 2020 at 13:33

Jay

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answered Aug 6, 2020 at 14:10

Frank van Puffelen

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2 Comments

Nitesh Over a year ago

How to use "chatUserRoles."+updatedUser.userId: updatedUser.role?

Frank van Puffelen Over a year ago

I updated the code in my answer to include the .dictionary that you're using, and also to show it without the variables. It's meant to be the replacement of your current line of code to update the document. If it isn't working for you, show what you tried and what the result was.

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