[LRUG] Need advice on creating Model Type A with same data from Model type B

Greg Molnar greg at molnar.io
Wed Mar 8 06:06:12 PST 2017


It complains about a missing param to assign_attributes: http://api.rubyonrails.org/ <http://api.rubyonrails.org/>

> On 8 Mar 2017, at 14:10, Jesse Waites <jesse.waites at gmail.com> wrote:
> 
> Hi all--
> 
> I have been tasked with building a report card feature. The end goal of this is that the user gets a monthly email with various statistics (Users logged in, Sites activated, things like hat)
> 
> I have settled on Report Stat model and Report Card models. One a month, Report Stat will run and save that data. I take the last 2 report stats (or any 2 report stats, really - thats why I built it this way) and generate the Report Card.
> 
> The thing is, most of the data from the Report Card will be the same data from the most recent Report Stat. The users_logged_in from the most recent Report Stat scan will be the number of users_logged_in in the Report Card. There are a few instances where I will want a percentage increase or decrease between Report Stats, I have a integer column ready for that and will just perform simple math on :users_logged_in between my various time frames via various Report Stats.
> 
> My issue is, how can I most easily transplant the data from ReportStat into the ReportCard. I could so it manually column by column but that seems like the wrong way to do it, I want to do it programmatically. The columns and datatypes are all the same.
> 
> At the end of the day, I think I'd like to be able to do ReportCard.create(:user_id => current_user.id <http://current_user.id/>, 6, 7)
> 
> with 6 and 7 being the ID number of the reports I want comparisons from.
> 
> 
> 
> 
> I am trying it this way but am getting "wrong number of arguments:
> 
> 
> 
> 
> class ReportCard < ActiveRecord::Base
>   belongs_to :user
> 
>   attr_accessible :user_id, :oldest_report_stat_id, :newest_report_stat_id, :num_active_and_licensed_aeds,
>   :num_active_sites, :num_users_logged_in, :aeds_total, :aeds_compliant, :aed_sites_total,
>   :aed_sites_compliant, :responders_total, :responders_compliant, :num_active_and_licensed_aeds_percentage,
>   :num_active_sites_percentage, :num_users_logged_in_percentage, :aeds_compliant_percentage,
>   :aed_site_compliant_percentage, :responders_compliant_percentage, :report_start_time, :report_end_time
> 
> 
> 
>   def execute
>     @newest_stat = ReportStat.find(self.newest_report_stat_id)
>     @oldest_stat = ReportStat.find(self.oldest_report_stat_id)
>     #@newest_stat.inspect
>     @newest_stat.assign_attributes.each do |attr_name, attr_value|
>       self.send("#{attr_name}=", "#{attr_value}")
>     end
>     # calculate_percentage_change
>   end
> 
> end
> 
> Here is my rails console output:
> 
> r = ReportCard.new
> => #<ReportCard id: nil, user_id: nil, created_at: nil, updated_at: nil, oldest_report_stat_id: nil, newest_report_stat_id: nil, num_active_and_licensed_aeds: nil, num_active_sites: nil, num_users_logged_in: nil, aeds_total: nil, aeds_compliant: nil, aed_sites_total: nil, aed_sites_compliant: nil, responders_total: nil, responders_compliant: nil, num_active_and_licensed_aeds_percentage: nil, num_active_sites_percentage: nil, num_users_logged_in_percentage: nil, aeds_compliant_percentage: nil, aed_site_compliant_percentage: nil, responders_compliant_percentage: nil, report_start_time: nil, report_end_time: nil>
> [2] pry(main)> r.oldest_report_stat_id = 6
> => 6
> [3] pry(main)> r.newest_report_stat_id = 7
> => 7
> [4] pry(main)> r.execute
>   ReportStat Load (1.3ms)  SELECT "report_stats".* FROM "report_stats" WHERE "report_stats"."id" = $1 LIMIT 1  [["id", 7]]
>   ReportStat Load (0.4ms)  SELECT "report_stats".* FROM "report_stats" WHERE "report_stats"."id" = $1 LIMIT 1  [["id", 6]]
> ArgumentError: wrong number of arguments (0 for 1..2)
> from /Users/enpro/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/activerecord-3.2.17/lib/active_record/attribute_assignment.rb:66:in `assign_attributes'
> 
> 
> Any ideas? Maybe syntax error? Ive dumped way too much time into this and need to move on to the rest of the feature. Thank you LRUG!
> 
> 
> 
> 
> -- 
> Jesse Waites
> Web Developer
> JesseWaites.com <http://jessewaites.com/>_______________________________________________
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