On Jul 16, 2009, at 1:25 PM, Älphä Blüë wrote:
>
> I've spent hours researching the subject and have tried many test
> sequences in IRB, and rails console but I'm just having trouble making
> headway into what is probably a very easy subject.
>
> I understand arrays with at least 4 other languages but with Ruby I
> haven't found a mental connection with how I can assign variables to
> arrays..
>
> Take for example:
>
> def calculate_tsos(model, datavar, teamvar, valvar)
> var = model.compiled_this_week.find(:all)
> var.each_with_index do |rows, i|
> puts "#{model} [ Row #{i} | Team ID = #{rows.team_id} | Team =
> #{rows.team.name} | #{datavar} = #{rows.__send__(datavar)}"
> end
> end
>
> This will give me:
>
> TotalOffense [ Row 0 | Team ID = 5 | Team = Tulsa | ydspgm = 569.86
> TotalOffense [ Row 1 | Team ID = 47 | Team = Houston | ydspgm = 562.77
> TotalOffense [ Row 2 | Team ID = 20 | Team = Oklahoma | ydspgm =
> 547.86
> etc. etc.
>
> So far, so good. I can at least see the data that I want.
>
> Now, I want to assign the Team ID and the ydspgm to variables that I
> can
> manipulate and use later on. Normally, I would think that I could do
> something like this:
>
> def calculate_tsos(model, datavar, teamvar, valvar)
> var = model.compiled_this_week.find(:all)
> var.each_with_index do |rows, i|
> teamvar[i] = rows.team.id
> valvar[i] = rows.__send__(datavar)
> puts "#{model} [ Row #{i} | Team ID = #{teamid[i]} | Team =
> #{rows.team.name} | #{datavar} = #{teamval[i]}"
> end
> end
>
> But I get a..
>
> undefined method `[]=' for 0:Fixnum
>
Down below you say you make this call and pass 'to_team_id' as the
argument to 'teamvar'. So teamvar is an integer... not array. Just
above you are trying to do "teamvar[i]". You can't do that on an
integer (which is what your error is trying to tell you).
If it were me I'd do this:
def calculate_tsos(model, datavar)
var = model.compiled_this_week.find(:all)
teamvar = [] # you need this so that the variable continues to exist
after the each_with_index block.
valvar = [] # same for this one.
var.each_with_index do |rows, i|
teamvar[i] = rows.team.id
valvar[i] = rows.__send__(datavar)
puts "#{model} [ Row #{i} | Team ID = #{teamid[i]} | Team =
#{rows.team.name} | #{datavar} = #{teamval[i]}"
end
[teamvar, valvar] #return the results
end
And then call it like this:
tv, vv = calculate_tsos(....)
> So, before responding let me explain what I've been trying to do and
> perhaps you can explain to me how I "should" be doing it rather than
> the
> way I have been trying to do it:
>
> Summary: Rake task is being used to pull data, calculate data, and
> save
> data.
>
> In my rake file I am performing the following:
>
> update_tsos_offense = TsosOffense.new
> update_tsos_offense.calculate_tsos(TotalOffense, "ydspgm", to_team_id,
> to_value)
>
> This creates a new object in TsosOffense. The method it's calling is
> the one I posted above that I'm having some difficulties with. I'm
> supplying the model name, the field, a variable to store the team_id
> in,
> and a value to store the field information in.
>
> I was going to call a ruby file in libs from TsosOffense to perform my
> calculations but perhaps I could just do the calculations in this
> method.
>
> Once I do my calculations for this portion of the rake task, it
> needs to
> be "held in queue" - not saved, just waiting to be saved...
>
> There are 13 more iterations in the rake task calling 13 other models
> and 13 other fields, further assigning variables.
>
> When all 14 of these calls are finished, I want to save all 14 columns
> of information to my new table which is the table in the TsosOffense
> model..
>
> However, I'm having great difficulty in trying to find a best
> practices
> scenario for doing this. I learn more from code and by doing than I
> do
> anything. Could someone please provide a short idea of how I could
> accomplish this?
>
> Thank you kindly.
> --
> Posted via http://www.ruby-forum.com/.
>
> >
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