Support for nested objects for event properties (hash of hashes)

[danielgomezrico]

There are some events that require nested properties, for example, if you want to record a Product List Viewed you need to send the products array with each product property.

Check the example here:
https://segment.com/docs/connections/spec/ecommerce/v2/#product-list-viewed

Segment.track('Product List Viewed', {
  'list_id': 'hot_deals_1',
  'category': 'Deals',
  'products': [
    {
      'product_id': '507f1f77bcf86cd799439011',
      'sku': '45790-32',
      'name': 'Monopoly: 3rd Edition',
      'price': 19,
      'position': 1,
      'category': 'Games',
      'url': 'https://www.example.com/product/path',
      'image_url': 'https://www.example.com/product/path.jpg'
    },
    {
      'product_id': '505bd76785ebb509fc183733',
      'sku': '46493-32',
      'name': 'Uno Card Game',
      'price': 3,
      'position': 2,
      'category': 'Games'
    }
  ]
});

Current

If you send this with segment it returns a crash which is shown in #62

/flutter (10715): Invalid argument: Instance of 'MappedListIterable<MapEntry, Map<String, dynamic>>'
I/flutter (10715): 	#0      StandardMessageCodec.writeValue (package:flutter/src/services/message_codecs.dart:404:7)
I/flutter (10715): 	#1      StandardMessageCodec.writeValue.<anonymous closure> (package:flutter/src/services/message_codecs.dart:401:9)
I/flutter (10715): 	#2      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
I/flutter (10715): 	#3      StandardMessageCodec.writeValue (package:flutter/src/services/message_codecs.dart:399:13)
I/flutter (10715): 	#4      StandardMessageCodec.writeValue.<anonymous closure> (package:flutter/src/services/message_codecs.dart:401:9)
I/flutter (10715): 	#5      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
I/flutter (10715): 	#6      StandardMessageCodec.writeValue (package:flutter/src/services/message_codecs.dart:399:13)
I/flutter (10715): 	#7      StandardMethodCodec.encodeMethodCall (package:flutter/src/services/message_codecs.dart:536:18)
I/flutter (10715): 	#8      MethodChannel._invokeMethod (package:flutter/src/servi

Expected

No errors and nested properties works fine

[nmarko91]

Hey - any chance we can reopen this one? It looks like the fix was android only or I'm doing something wrong but it does not work on iOS (same error Invalid argument: Instance of ...)

[danielgomezrico]

@nmarko91 can you share the hole error you are getting?

[nmarko91]

Nevermind, I made a mistake, it's working correctly - sorry 🙈