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POWhat is the 'Rails Way' to implement a dynamic reporting system on data
 

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  1. POWhat is the 'Rails Way' to implement a dynamic reporting system on data
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    <h3>Intro</h3> <p>I'm doing a system where I have a very simple layout only consisting of transactions (with basic CRUD). Each transaction has a date, a type, a debit amount (minus) and a credit amount (plus). Think of an online banking statement and that's pretty much it.</p> <p>The issue I'm having is keeping my controller skinny and worrying about possibly over-querying the database.</p> <h3>A Simple Report Example</h3> <ul> <li>The total debit over the chosen period e.g. <code>SUM(debit) as total_debit</code></li> <li>The total credit over the chosen period e.g. <code>SUM(credit) as total_credit</code></li> <li><p>The overall total e.g. <code>total_credit - total_debit</code></p></li> <li><p>The report must allow a dynamic date range e.g. <code>where(date BETWEEN 'x' and 'y')</code></p></li> <li>The date range would never be more than a year and will only be a max of say 1000 transactions/rows at a time</li> </ul> <p>So in the controller I create:</p> <pre><code>def report @d = Transaction.select("SUM(debit) as total_debit").where("date BETWEEN 'x' AND 'y'") @c = Transaction.select("SUM(credit) as total_credit").where("date BETWEEN 'x' AND 'y'") @t = @c.credit_total - @d.debit_total end </code></pre> <h3>Additional Question Info</h3> <p>My actual report has closer to 6 or 7 database queries (e.g. pulling out the total credit/debit as per type == 1 or type == 2 etc) and has many more calculations e.g totalling up certain credit/debit types and then adding and removing these totals off other totals.</p> <p>I'm trying my best to adhere to 'skinny model, fat controller' but am having issues with the amount of variables my controller needs to pass to the view. Rails has seemed very straightforward up until the point where you create variables to pass to the view. I don't see how else you do it apart from putting the variable creating line into the controller and making it 'skinnier' by putting some query bits and pieces into the model.</p> <p>Is there something I'm missing where you create variables in the model and then have the controller pass those to the view?</p>
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    1. COToo many questions in one. Please try to reduce them down to your top one or two to avoid confusing answers and diluting the overall question's worth. Stack Overflow wants concise and well defined questions and answers.
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    2. COI'll have a go making this simpler later on, I'm going to do a bit more searching as I thought this would have been quite a common issue, maybe I'm going overboard and worrying too much about the skinny controller, fat model phrase...
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    3. COI would introduce a `TransactionReporter` object, it should execute the queries it needs and handle all of the calculations, when you execute ActiveRecord queries they basically return ruby Arrays, so you can store that data in instance variables on the reporter object and return those to the views after all calculations have been made
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