Get attribute values before type casting to fix enum attributes insert

[carlos-musetti]

I have a model with an enum.

When trying to insert records into this model, the INSERT INTO tuple would have the cast value (i.e. raw instead of 0), triggering an error since postgresql` expected the value before casting.

[sncalvo]

Can you make a spec to verify usage with enums? @carlos-musetti

[Copilot]

Pull request overview

Fixes staging inserts for ActiveRecord enum-backed columns by normalizing AR records into “database-ready” attribute values (instead of enum labels), and adds regression coverage across supported DB adapters.

Changes:

• Add regression specs ensuring enum attributes are staged as underlying DB integers (AR objects, relations, and plain hashes).
• Update StagingTable::Session record normalization to prefer attributes_for_database / read_attribute_for_database.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
spec/staging_table/enum_attributes_spec.rb	Adds multi-adapter regression tests for enum value normalization through staging + transfer.
lib/staging_table/session.rb	Changes normalization logic to extract database values for AR records (aimed at fixing enum inserts).

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