find_by_sql in Rails, accessing the resulting array

Question

I\'m trying to run a query in a very quick and dirty way in Rails, without putting the rest of the model in place. I know this is bad practice but I just need a quick resul

Answer 1

So, I had a hacky solution for this, but it works great. Create a table that has the same output as your function and reference it, then just call a function that does a find_by_sql to populate the model.

Create a dummy table:

CREATE TABLE report.compliance_year (
 id BIGSERIAL,
 year TIMESTAMP,
 compliance NUMERIC(20,2),
 fund_id INT);

Then, create a model that uses the empty table:

class Visualization::ComplianceByYear < ActiveRecord::Base
    self.table_name = 'report.compliance_year'
    def compliance_by_year(fund_id)
        Visualization::ComplianceByYear.find_by_sql(["
            SELECT year, compliance, fund_id
              FROM report.usp_compliance_year(ARRAY[?])", fund_id])
    end
end 

In your controller, you can populate it:

def visualizations
  @compliancebyyear = Visualization::ComplianceByYear.new()
  @compliancefunds = @compliancebyyear.compliance_by_year(current_group.id)
  binding.pry
end

Then, you can see it populate with what you need:

[1] pry(#)> @compliancefunds
[
[0] # {
          :year => Mon, 31 Dec 2012 19:00:00 EST -05:00,
    :compliance => 0.93,
       :fund_id => 1
},
[1] # {
          :year => Tue, 31 Dec 2013 19:00:00 EST -05:00,
    :compliance => 0.93,
       :fund_id => 4129
},
[2] # {
          :year => Wed, 31 Dec 2014 19:00:00 EST -05:00,
    :compliance => 0.93,
       :fund_id => 4129
}
]