Please help me understand how arrays are translated in rails

rubyonrails-talk
1

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(....)