Changede UUIDField data type to translate to VARCHAR(36)

[MarekovicJan]

Hi,

I was playing with django-snowflake library and tried to connect one of my other projects to Snowflake.
On that project our models PKs are mainly UUIDs, so when I ran the migration I got an error saying that
UUID string is too long for a VARCHAR(32) field and I started looking into the Snowflake documentation
and saw that Snowflake actually usses VARCHAR(36) for UUID fields (here is also a link to the docs: https://docs.snowflake.com/en/sql-reference/functions/uuid_string). Once I changed that in my library it fixed the problem.

[timgraham]

It seems your project uses Snowflake's UUID_STRING() function to generate values, but this isn't what Django expects. Django stores the UUID value without dashes (value.hex).

[Tatsh]

I support the idea behind this change. But I also need the backend to save the UUID with hyphens. Unfortunately I think monkeypatching UUIDField.get_db_prep_value is required so that str(uuid) can be used in place .hex.

[timgraham]

I'd recommend using a custom field if you need to store a UUID with dashes,