Question about relationships in Memento

[Keith G]

Say I have two libraries: Containers and Items. One container can contain many items so it's a one-to-many relationship.

Which library should I create the relationship in? In other words, which library should contain the 'Link to entry' field?

[Mmm]

Обычно так...

четверг, 16 июля 2026 г. в 04:07:58 UTC+3, Keith G:

[David Gilmore]

The link you establish can go both ways. The usual way is to have the "Containers" be the parent record, with the "Items" be the child record(s). So usually, you would have the link field be in the parent library ("Containers").

[Mmm]

Есть и другие пояснения...

GigaChat:

Let's say you have two libraries: "Containers" and "Elements". One container can hold many elements, so this is a one-to-many relationship.

In which library should the relationship be created? In other words, in which library should the "Link to record" field be placed?

The one-to-many relationship is implemented by placing a reference (link) to the parent record inside the child table.

In your case:

- "Containers" is the parent (main) table. One of its records can be linked to many records from another table.

- "Elements" is the child (subordinate) table. Each specific element belongs to only one container.

Therefore, the link/reference field ("Link to record") should be created in the "Elements" library. This field will store the identifier of the container to which the given element belongs.

Why is it done this way?

This is the most efficient and correct way to organize data (relational approach).

1. Data integrity. If you delete a container, the system can easily find all related elements (by searching the reference field in the "Elements" table) and either prevent deletion or remove them together with the container (cascade delete).

2. Query flexibility. You can easily retrieve all elements for a specific container, as well as check which container any chosen element belongs to.

3. Performance. Searching for elements by a specific container is very fast thanks to indexing of the reference field.

If you had placed the reference in the opposite direction (in the "Containers" library), you would have had to store a list of multiple element IDs in a single field. This is extremely inconvenient: it would be difficult to add or remove individual elements, check uniqueness, and searches would be inefficient.

Thus, the only correct solution is to create a reference-type field in the "Elements" library that points to a record in the "Containers" library.

четверг, 16 июля 2026 г. в 17:52:09 UTC+3, aa6...@gmail.com: