Add custom field name tag to models

[xelab04]

I admit maybe opening this PR to the raw field names might not be appropriate.
I have added a table_name flag, which would allow setting a custom name for the db field used for a parameter.

Usage should be something like:

#[model]
pub struct Meetup {
    #[model(primary_key)]
    pub id: Auto<i32>,
    #[model(table_name = "world")]
    pub hello: LimitedString<255>,

So instead of the db field being "hello", it will be "world" instead.
I did run cargo test --all-features though I'll have to write some tests for this feature too.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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Files with missing lines	Coverage Δ
cot-codegen/src/model.rs	94.26% <100.00%> (+0.06%)	⬆️

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[m4tx]

Ha, looks easy! Please make sure to add tests for this, but otherwise it looks good.

If you feel like it, it might be useful to add similar functionality to specify a custom table names for models, too.

[m4tx]

I admit maybe opening this PR to the raw field names might not be appropriate.

Nah, it's completely fine - after all, it builds on top of my PR. I'll try to merge that one in the next day or two, so that we'll be able to merge yours, too.

The part you're changing, however, might change in my PR - I've just realized there's Ident::unraw which will simplify the code a little bit.

[xelab04]

I have added a test, I think it should be alright?
I will alter my PR to fit the unraw if necessary.

[xelab04]

add similar functionality to specify a custom table names for models

I noticed that feature is already there as #[model(table_name = "helloworld")] and is around line 97 of the model.rs codegen file.

[seqre]

add similar functionality to specify a custom table names for models

I noticed that feature is already there as #[model(table_name = "helloworld")] and is around line 97 of the model.rs codegen file.

You're actually right, it's already implemented (but propably not well documented)!

For models defined as:

#[model]
pub struct Link {
    // <SNIPPED>
}

#[model(table_name = "custom-name")]
pub struct Link2 {
    // <SNIPPED>
}

It created the following migration:

//! Generated by cot CLI 0.5.0 on 2026-02-25 10:57:51+00:00

#[derive(Debug, Copy, Clone)]
pub(super) struct Migration;
impl ::cot::db::migrations::Migration for Migration {
    const APP_NAME: &'static str = "my_project";
    const MIGRATION_NAME: &'static str = "m_0001_initial";
    const DEPENDENCIES: &'static [::cot::db::migrations::MigrationDependency] = &[];
    const OPERATIONS: &'static [::cot::db::migrations::Operation] = &[
        ::cot::db::migrations::Operation::create_model()
            .table_name(::cot::db::Identifier::new("my_project__link"))
            .fields(
                // <SNIPPED>
            )
            .build(),
        ::cot::db::migrations::Operation::create_model()
            .table_name(::cot::db::Identifier::new("my_project__custom-name"))
            .fields(
                // <SNIPPED>
            )
            .build(),
    ];
}

So you can focus on adding that customizability only to field names!