About the association part: AFAIK, the only required columns are _id (of course), rows and columns. Here is a gist of the association representation. https://gist.github.com/3145116
Is there any others ?
About the association part:
AFAIK, the only required columns are _id (of course), rows and columns.
Here is a gist of the association representation. https://gist.github.com/3145116
Is there any others ?