ROM 4.2

[jodosha]

Migrate to ROM 4.2

[codecov]

Codecov Report

Merging #490 into unstable will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           unstable     #490      +/-   ##
============================================
+ Coverage     98.73%   98.75%   +0.01%     
============================================
  Files           108      108              
  Lines          5535     5539       +4     
============================================
+ Hits           5465     5470       +5     
+ Misses           70       69       -1

Impacted Files	Coverage Δ
spec/unit/hanami/model/sql/schema/int_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/float_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/time_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/array_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/decimal_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/date_spec.rb	100% <ø> (ø)	⬆️
...c/integration/hanami/model/repository/base_spec.rb	96.19% <ø> (ø)	⬆️
spec/unit/hanami/model/sql/schema/hash_spec.rb	100% <ø> (ø)	⬆️
...pec/unit/hanami/model/sql/schema/date_time_spec.rb	100% <ø> (ø)	⬆️
spec/unit/hanami/model/migrator/sqlite.rb	99.59% <100%> (ø)	⬆️
... and 7 more

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[benbachhuber]

Hi Luca,

Nice :-) I realize this PR is for hanami 2.0. I hope you don't mind me asking: Is it possible to use this with hanami 1.2 (of course at own risk and with a fork:-)?
There seem to be not so many breaking changes.

Would love to use new ROM functionality like each_batch.

Thank you already in advance.
-Ben

[solnic]

LGTM except messy commit history :)

[jodosha]

@BenBach Yes, it's theoretically possible, even if I haven't tried yet.
Please ping me at any time if you'll find problems.

---

On a side note, we're planning to release these changes sooner than expected. In order to make the upgrade smoother, we want to split previously planned changes in Hanami 2 and 3.

The first batch, will have ROM 4 (this PR) and minor features/breaking changes.
Whereas Hanami 3 will ship with Action and View changes.

[jodosha]

@solnic Thanks for the review. It's probably better to squash and merge these commits, and manually give credit for the changes in CHANGELOG.