Ensure bulk_upsert accepts any iterable for rows

[ericpalakovichcarr]

This updates the bulk_insert and bulk_update methods to allows rows to be any object that's an iterable (i.e. implements __getitem__ and/or __iter__).

Currently, the two methods require rows to be a list (or specifically, an object that supports indexing). I ran into this when I was using a dict to generate the rows to submit. Here's a contrived example:

    rows = {
        1: {pk: 1, val1: False, val2: False},
        4: {pk: 4, val1: False, val2: False},  
    }
    for pk in pks_where_val1_is_true:
        rows[pk]["val1"] = True
    for pk in pks_where_val2_is_true:
        rows[pk]["val2"] = True
    model.objects.bulk_upsert(
        conflict_target=["pk"], rows=rows.values(), return_model=True
    )

Since rows.values() returns a dictionary view object, it doesn't support indexing (e.g. rows[0]). The existing logic that assumes the rows argument supports indexing causes an exception. This PR removes that requirement, allowing any iterable to be passed without first being converted to a list.

I've also included tests 🎉

[Photonios]

This is excellent work! Many thanks for your contribution 👍

[Photonios]

Released in v1.22 🎉 https://github.com/SectorLabs/django-postgres-extra/releases/tag/v1.22

[utapyngo]

This fails when a generator expression is passed as rows. The first is_empty call consumes the generator, and the StopIteration exception is raised when trying to get the first row:

  File "psqlextra/manager/manager.py", line 633, in bulk_upsert
    conflict_target, rows, index_predicate, return_model
  File "psqlextra/manager/manager.py", line 336, in bulk_upsert
    return self.bulk_insert(rows, return_model)
  File "psqlextra/manager/manager.py", line 169, in bulk_insert
    compiler = self._build_insert_compiler(rows)
  File "psqlextra/manager/manager.py", line 357, in _build_insert_compiler
    first_row = next(rows_iter)
StopIteration

[ericpalakovichcarr]

Thanks for catching this, @utapyngo. I created PR #135 that'll fix the issue 👍