mysql - Database: mark entity (record) as deleted for certain users -

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given database table records multiple users in application can see, efficient way mark record deleted multiple users without deleting record (soft delete)?

requirements:

  • multiple users should able mark record deleted
  • when user marks record deleted, user b, c, d... should still able see until mark deleted themselves
  • an administrative user should able mark record deleted record no longer visible others.

i've thought following example curious see other programmers do.

table: entity

+----------------+---------------+--------+ | id             | data          | active | | (int, primary) | (varchar)     | (int)  | +----------------+---------------+--------+ |              1 | foo           |      1 | <-- record active (visible) |              2 | bar           |      0 | <-- no user can see record +----------------+---------------+--------+

an administrative user set active flag 0 remove record scope of users.

table: entity_deleted_user

+----------------+----------------+ | entity_id      | user_id        |  | (int, primary) | (int, primary) | +----------------+----------------+ |              1 |            100 | <-- |              1 |            150 | <-- users 100, 150 , 37 can not see entity 1 |              1 |             37 | <-- +----------------+----------------+

is there more efficient way this?

what you've described how in relational manner. it's one-to-many mapping: attempting map state of 1 item (the entity) many (the users). ability of admin override status applies entity, should in entity table.

an alternative -and non-relational- method use single integer field bit set in entity table, each bit representing deleted entity status of individual user. remove need entity_deleted_user table (and admin set bits hide everyone) scheme has many disadvantages (limited user count, no referential integrity, etc).


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