Android's Architecture Components Version 0.7 by Mark L. Murphy

Author:Mark L. Murphy
Language: eng
Format: epub, mobi
Publisher: CommonsWare
Published: 2018-01-14T23:42:04+00:00

Implementing a Join Entity

The General/RoomMN sample project demonstrates an M:N relation. From earlier chapters, we have a Customer entity and a Category entity. Previously, those were unrelated. Now, let’s implement an M:N relation between them, so a Customer can be a member of zero or more categories, and a Category can have zero or more customers.

Note that we are retaining the tree structure for Category used previously. For the purposes of this chapter, we are ignoring that, considering a customer to belong to a category only via a direct relationship. So for example, if customer Foo belongs to category Child, which has a parent category Parent, Foo is not a member of Parent. The tree structure simply organizes categories, without impacting customers.

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