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Lucien Cartier-Tilet
3307aa679d
This commit introduces support for PostgreSQL generated columns by adding two new field attributes to the `Georm` derive macro: `#[georm(generated)]` and `#[georm(generated_always)]`. The `#[georm(generated_always)]` attribute is for fields that are always generated by the database, such as `GENERATED ALWAYS AS IDENTITY` columns or columns with a `GENERATED ALWAYS AS (expression) STORED` clause. These fields are now excluded from `INSERT` and `UPDATE` statements, preventing accidental writes and ensuring data integrity at compile time. The `#[georm(generated)]` attribute is for fields that have a default value generated by the database but can also be manually overridden, such as `GENERATED BY DEFAULT AS IDENTITY` columns. These fields behave similarly to `#[georm(defaultable)]` fields, allowing them to be omitted from `INSERT` statements to use the database-generated value. For now, the behaviour is the same between `#[georm(generated)]` and `#[georm(defaultable)]`, but the addition of the former now will be useful for future features. Key changes: - Added `generated` and `generated_always` attributes to `GeormFieldAttributes`. - Introduced `GeneratedType` enum in the IR to represent the different generation strategies. - Modified the `create` and `update` query generation to exclude fields marked with `#[georm(generated_always)]`. - Integrated `#[georm(generated)]` fields with the existing defaultable struct logic. - Added validation to prevent conflicting attribute usage, namely `#[georm(generated)]` and `#[georm(generated_always)]` on the same field. Implements #3