Modeling - Practical Neo4j - page 28

Consumption Graph
While the consumption graph is primarily focused on the items that one might purchase - whether it is a good or
service - it also can be viewed from perspectives outside of pure commerce, such as the consumption of video content
or other digital content. In that sense, it is related somewhat to the Interest graph.
Figure 3-14 displays how consumption might be modeled within a relational database. In this case, the model
could have taken the form of an e-commerce product catalog.
Figure 3-14. Entity relationship diagram with a user's product views
To gain a wider view of consumption, we are more interested in viewing consumption as a whole and not just
in terms of retail items. Therefore, the model needs to be expanded to account for other forms of consumption, as
shown in the relational model in Figure 3-15 . In expanding this beyond the simple commerce system, one method to
accomplish this feature is to modify the join table to ensure that it provides a type. As you might surmise, expanding
the scope of the consumption view can get unmanageable very quickly.