I would look into the concept of a single table inheritance for a 
transactions table...you'd have to add an extra attribute/column that would 
be 'transaction' type to indicate whether it's an expense or income, but 
this should be able to be done with a simple 1 to many relationship - a 
user has many transactions - Single Table Inheritance is great for things 
like this and Rails handles it very easily.

On Monday, August 31, 2015 at 7:47:26 AM UTC-7, Pradeep Achuthan wrote:
>
> Hi, 
>
> I am building an expense tracker application and I am in middle of data 
> modelling. I have a Users table. Each user will log his expenses with 
> expense type and income with income type. So I need to know how can we set 
> up associations for it.
>
> I have User, Expense, Income and UserTransaction models.
>
> Expense and Income will have following fields
>
> * id, date, category, amount, description, user_id, currency*
>
> I am not sure whether I need UserTransaction table also.
> But my business requirement is as follows
>
> I should be able to get all expenses/income of a user with date range and 
> also with category
>
> I should also be able to get all transactions occurred with date range. 
>

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