gormschema: support customize JoinTable

[luantranminh]

Fix #39

[luantranminh]

@ronenlu 👀 Could you have a look? Happy to discuss more

[ronenlu]

@ronenlu 👀 Could you have a look? Happy to discuss more

@luantranminh Thank you for your contribution! I will review the PR soon

[luantranminh]

Looking at the unit test at the moment, the CREATE CONSTRAINT is not in the desired order, and it's also different when I run the test on my machine. 🏃‍♂️

[luantranminh]

I found interesting stuff here. GORM stores table relationships inside a Map. Looping through a Map is not guaranteed to produce the same order all the time.

https://github.com/go-gorm/gorm/blob/8c18714462de07fa3392b99eda089f2f9e3b6042/schema/schema.go#L186

We're looping through it here:

atlas-provider-gorm/gormschema/gorm.go

Line 147 in e5d6dbf

for _, rel := range stmt.Schema.Relationships.Relations {

Resulting SQL statements output could be different each time the CI runs
It hurts our tests, but the migration files are fine. I'll submit another commit to sort the Relations out before looping.

[luantranminh]

Ronen said the forked project is missing Secrets to run the integration tests

[giautm]

Ronen said the forked project is missing Secrets to run the integration tests

Yes, because the repo's secret doesn't share with the forked repository.