Firestore - add array of objects

Question

I'm having trobule with adding Array of Objects (tables) to Array of objects(restaurants). By that i mean, that I have following Firestore structure:

... (other data)
restaurants: [
   0: {
      name: name_0
      ...
      tables: [
          0: { no_chairs: 5, ... },
      ]
   },
   ...
]

I know how to add new object to restaurants, but I'm having trouble with adding new restaurant if tables list contains any data.

My code rn:

    var collection = firestore.collection('usersData')
        .doc(this.currentUser.uid).collection('buisness').doc('restaurants');
    collection.update({
      'restaurants': FieldValue.arrayUnion([restaurant.toJson()]),
    }).then( ... // reaction based on api answer

class Restaurant:
     Map<String, dynamic> toJson() => {
    'name': name,
    ...
    'tables': tables!=null? [tables] : [], // I think that I should modify this line
  };

class Table:
    Map<String, dynamic> toJson()=> { // Or this method / use another
    'no_chairs': no_chairs,
    ...
  };

Is there any simple way to do it? Preferably without modyfing firestore file structure, but if it is necessary I'm willing to do it.

Extra question: How to modify object in tables list? For example I want to change no_chairs to 7

Victor Eronmosele · Accepted Answer · 2021-05-26 22:12:58Z

2

From your code above, the line below has a problem:

'tables': tables!=null? [tables] : [],

This part [tables] means you're putting the list tables as an element of the outer list.

To illustrate, if tables was as shown below:

List<int> tables = [1, 2, 3];

Then, [tables] is this:

[[1, 2, 3]]

Solution:

You can just use the tables variable directly since you're sending a list.

Before sending your tables object, you need to convert it to a list of Maps from the list of TableModel that is currently is (according to your comment below).

So you can modify your code to this:

'tables': tables != null ? tables.map((TableModel table) => table.toJson()).toList() : [],

Extra question: How to modify object in tables list? For example I want to change no_chairs to 7

Solution: You will have to get the actual list of restaurants and modify the exact table object you want and set the modified list to Firestore.

 var collection = firestore.collection('usersData').doc(this.currentUser.uid).collection('buisness').doc('restaurants');

 //Get list of restaurants
 List<Restaurant> restaurantList = ((await collection.get()).data()).map((dynamic restaurantJson) => Restaurant.fromJson(restaurantJson)).toList();

 Set number of chairs
 //
 restaurantList[restaurantIndex].tables[tableIndex].no_chairs = 7; //This assumes the no_chairs field is not final

 //Set list 
 collection.set({
   "restaurants": restaurantList.toJson()
 })

edited May 26, 2021 at 22:12

answered May 26, 2021 at 20:09

Victor Eronmosele

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4 Comments

next_99 Over a year ago

Without [] I get error: Failed to add restaurant: Invalid argument: Instance of 'TableModel' as response from firebase

Victor Eronmosele Over a year ago

Alright, I'll make an update with a fix for this.

Victor Eronmosele Over a year ago

@next_99, please check out the updated answer.

next_99 Over a year ago

Works great. Could you also help with extra question? - Editing value?

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