cbj4074

cbj4074

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Level 1
4,725 XP
May
06
5 months ago
Activity icon

Replied to Rental Management DB Schema

My inclination is that you should in fact sum the negative values when calculating the cost of maintenance. Anything that is an expense should be stated as a negative value, in my opinion, even when displayed on a report. If for whatever reason you want to display it as a positive value, then just multiply it by -1 for display purposes, on a per-report basis, as needed.

In any case, positive-vs-negative values is not a particularly important consideration, given the use-case you describe, and you could certainly store the type (Income or Expense), but taking that approach will complicate your queries unnecessarily, in my opinion.

My advice is to start building this. You can stare at the schema all day, but until you scaffold-out some models, pencil in the relationships, and play with it in Tinker, it'll be difficult to see any shortcomings in your logic.

May
01
5 months ago
Activity icon

Replied to Rental Management DB Schema

The polymorphic relationship seems okay upon first glance, although, I'm not sure you even need the type to track Income vs. Expense.

Why not use positive values to represent income and negative values to represent expense? That would make the computations a lot simpler, too.