Searching into json nested attributes does not works

[ThibaultRuby]

Affected version : v2.0.1

Current behavior:
When trying to use filter on nested attributes:

  const myModel = new MyModel(); // With any Dynamodels model
  const value = await myModel
    .query()
    .keys({
      pk: 'something',
    })
    .filter(attr('key.#key2').eq('something-to-match'))
    .execAll();

We get the following error:

ValidationException: ExpressionAttributeNames contains invalid key: Syntax error; key: "#key1.#key2f1a48369fb1b4fbf98c2ec8893a95063"

When it should just returns the filtered list.

The issues seems to be related to ExpressionAttributeNames mapping that is like this :

ExpressionAttributeNames: {
    '#sk': 'sk',
    '#key1.#key2f1a48369fb1b4fbf98c2ec8893a95063': 'key1.#key2'
  }

When it should be like that:

ExpressionAttributeNames: {
    '#sk': 'sk',
    '#key12f1a48369fb1b4fbf98c2ec8893a95063' : 'key1',
    '#key2<some-other-uuid>: 'key2'
  }

Imho, we should just be able to type 'key1.key2.key3' and Dynamodels should parse this and understand that this is a nested attribute case and correctly fills the ExpressionAttributeNames.