class ComputedTableSchema(ComputeField):
    prefetch = ('schema__name',)

    async def get_value(self, request: Request, obj: dict):
        return obj["schema__name"]

class ComputedColumnTableName(ComputeField):
    prefetch = ('table__name', 'table__schema__name')

    async def get_value(self, request: Request, obj: dict):
        return f'{obj["table__schema__name"]}.{obj["table__name"]}'

@app.register
class ColumnResource(Model):
    label = "Column"
    model = models.Column
    icon = "fas fa-columns"
    page_pre_title = "column list"
    page_title = "column model"
    fields = [
        "id",
        ComputedColumnTableName(name="table_full_name", label="Table"),
        "name",
        "is_primary",
        "comment",
    ]