Subquery in Rails report generation -

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I am creating a report in Ruby on Rails application and I understand how to use a subquery I'm struggling. / P>

Every survey has 'survey response' and it is quite easy to retrieve them, although I need a group according to one of those areas, 'jobcod', because I only Want to report one related information to a single jobcode in one line in the report

However, I need to know the component data that makes use of that job code because the reason I need to calculate data such as the media and standard deviation, and know the values ​​like this Need to understand the total yoga.

My thinking is that I get different jobs which are surveyed and then I receive personal responses to each jobcode as a loop through them.

Is this the right way to do or should I follow a different method?

You can use the named area to make groups of reactions easier to achieve: < / P> 

  named_scope: job_group, lambda {| Job_code | {: Terms = & gt; Put it in your modeled model, and use it like this:  
  job.responses .job_group ('some work code') and you will get an array of responses. You can use:  
  r = job.responses.job_group ('some work codes') R.map (and: total) = & gt; [1, 5, 3, 8]  
 
  Alternatively , you can get a quick write in custom SQL, so that the average / average / group gets the sum For such work of attributes, going through the rail can lead to significant gaps. 
 
  ActiveRecord :: Base.connection.execute ("custom SQL here")

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