Allow a user to delete a trip entry from the Trips table using the Primary
Key. While this type-checks and compiles, it doesn't appear to be working as
intended. Perhaps I should use an auto-incrementing integer as the Primary
Key. I'm not sure how I want to handle this, so I'm punting for now.
In the spirit of walking crawling before I walk, I'm preferring the less
powerful SQLite.Simple library to the more powerful (but mystifying) Persistent
library.
I believe data should be validated at each level of the stack:
- database
- server
- client
The database, in my opinion, is the most important layer at which to validate
because you can eliminate entire classes of bugs. However, the CHECK constraint
is limited, and the more complex the predicates are, the more expensive database
operations become.
At the server and client layers, the data validations can be more sophisticated
and return more useful error messages to help users better understand the shape
of the data that our application expects.
TL;DR:
- Created src/init.sql, which defines the tables
- Created a data/ directory to house .csv data to populate our db
- Updated the README with usage instructions
Query my SQLite database from within my Servant handlers. Nothing I've written
is domain-specific to the business logic yet -- I'm just making sure everything
integrates.