Module relation_has_many_composite_key 

Tests for has_many / belongs_to relationships whose foreign key spans multiple columns. These parallel the single-key relation tests so we can make sure composite-key behavior matches.

Two scenarios are used:

• crate::scenarios::composite_has_many_belongs_to — User with a single-column auto PK and a Todo whose PK is #[key(partition = user_id, local = id)]. The FK column is part of the child’s identity, so reassignment isn’t supported on backends that can’t mutate primary-key columns (DynamoDB).
• crate::scenarios::composite_fk_has_many_belongs_to — User with a composite PK (id, revision), and Todo with single PK and a two-column indexed FK. Used by the reassignment tests, which need the FK to be a plain updatable column.

See: https://github.com/tokio-rs/toasty/discussions/904

Modules

composite_add_remove_multiple_relation_option_belongs_to

composite_add_remove_single_relation_required_belongs_to

composite_assign_todo_to_user_on_update_query

composite_basic_has_many_and_belongs_to_preload

composite_belongs_to_required

composite_crud_has_one_required

composite_crud_user_todos

composite_delete_when_belongs_to_optional

composite_filter_by_belongs_to_field

composite_filter_parent_by_child_field

composite_has_many_insert_on_update

composite_nested_has_many_then_belongs_to_required

composite_preload_has_many_with_optional_belongs_to

composite_preload_on_empty_query

composite_remove_add_single_relation_option_belongs_to

composite_scoped_find_by_id

composite_select_belongs_to_basic

composite_user_batch_create_todos_one_level

composite_user_batch_create_todos_with_optional_field

composite_user_batch_create_two_todos_simple

Functions

composite_assign_existing_user_to_todo

composite_assign_todo_that_already_has_user_on_create

composite_assign_todo_that_already_has_user_on_update

composite_associate_new_user_with_todo_on_update_query_via_creation

composite_associate_new_user_with_todo_on_update_via_creation

composite_belongs_to_missing_index_is_error

When a composite-key belongs_to has no covering index on the parent side, schema verification must return a helpful invalid-schema error rather than panicking with failed to find relation index.

composite_fk_belongs_to_preload

Preload a belongs_to whose foreign key spans two columns. Seeds two users so a filter that doesn’t actually compare child FK columns against parent key columns (e.g. one comparing the child’s own columns to themselves, which matches every user) is caught by the assertions.

composite_reassign_relation_required_belongs_to