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6
votes
3answers
457 views

Drawing the line between models & libraries?

As my webapps increase in size, so does the complexity. In order to keep my classes & files structured and easy-to-access, I am starting to get more and more confused: I have some very clearly ...
0
votes
1answer
97 views

Model Design: Which layers should access resources?

I am implementing a model design where DB tables are 'resources', and a model can use many 'resources'. When I return a row from a table, it is represented by an 'item'. (This came from a book by ...
1
vote
4answers
235 views

how to create a data model for the following problem

How to tackle 2-D and 3-D space in data ? lets say you are working on a power grid problem. You need to represent Towers; transmission lines; transformers and every thing else in a 2-D space. How ...