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The second part of this tutorial will cover mutations (the way to update data) and advanced topics about client caching.In the first part of the guide we learned about what Graph QL is, and created a very first version of the Martian Library application.
Note that it’s not necessary to authenticate users using Graph QL API: it could be done “outside”, e.g., via the good old REST.
The rest of the article is devoted to practice: we will add mutations to authenticate users and allow them to add new items to the Martian library.
Let’s take a quick look at what’s on our plate after completing the previous part of the tutorial.
Selecting a record in one table will update the children tables with the matching records.
There is no limit for the number of tables to cascade.