search for: productvari

...variation should inherit all of its properties from product unless the property is defined specifically for the product variation. Here''s how I''ve tried to implement this: I have a simple Product model that has various properties such as name and price. I also have another model, ProductVariation that extends Product using single table inheritance. ProductVariation adds a belongs_to relationship that stores the "parent product" - i.e. the one the ProductVariation overrides. I''ve managed to get attributes working correctly - if I call variation.price it uses method_m...

Dear list, I am from an engineering background, accustomed to work with tolerances. For example, I have measured Q = 0.15 +- 0.01 m^3/s H = 10 +- 0.1 m and now I want to calculate P = 5 * Q * H and get a value with a tolerance +- What is the elegant way of doing this in R? Thank you, Jan

Hi all, I''m having trouble figuring out how to handle stock levels in a new store I''m building. When products are entered into the admin of the store, they have a stock number associated with them. What I''m not sure about, is how I go about maintaining this stock level. Take this scenario: 1. User A adds an item to their cart, and I check that it''s in stock -