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Issue 16.4 ('Mojave')
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FEATURE

Refactoring a Controller Module, Part 1

Dividing the medication controller module

Issue: 16.4 (July/August 2018)
Author: JC Cruz
Article Description: n>No description availabl
Article Length (in bytes): 43,731
Starting Page Number: r>
Article Number: 16404
Resource File(s):

Download Icon project16404.zip Updated: 2018-07-02 22:39:13

Related Link(s): None

Excerpt of article text...

In my last three articles, I extolled the benefits of a model class. I explained how I designed two model classes: one for database data, the other for predicate data. I also showed how I incorporated those models into a controller module.

Now I turn my focus on the controller module. I have already modified one such module (namely, vitalsLib). But what if the controller module works with multiple database tables? What if it does more than just manage the data flow between views and models?

I shall describe the steps I took in this article.

Readers must have a working knowledge of Xojo, SQLite, and object-oriented design. The updated version of the demo project FooHealth (Mk13) is available from the magazine's website.

Planning The Update

When I updated the controller module vitalsLib, I made three key changes. I replaced its properties with instances of the ModelSQL class. I rewrote its entry methods to make use of instances of ModelPredicate and ModelSQL. And I removed those private methods made redundant by ModelSQL.

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