Now that we have a firm foundation in Flask and how the user interface is designed, we are ready to begin writing the code for each of the versions of the application starting with the relational database version.
As you will see, the evolution of the application from a pure relational model to a document model demonstrates how we can avoid some of the messier aspects of using relational data—even in the hybrid example. One element that may surprise you is the length and complexity of the code for the document store version is considerably shorter ...
