CODEWITHSUNDEEP
ruby-on-railsruby
davidb
davidb

Reputation: 8954

Using collect in send with different parameters

I have a class called Trial which has_many results. Now What I want to do is some calculating with differend rows.

So I have an Array with all the collumn names that should be collected. And I want to use the Collect method but Its kind of tricky.

t = Trial.find(<id>)
["collumn1", "collunn2", "collumn3"].each do |collumn_name|
  data = t.results.send("collect", &:collumn_name)
  # HERE I WANT DO WORK WITH THE COLLECTED DATA
end

But it doesnt work because the collect method excepts some block not String. How can I deal with this Problem?

Upvotes: 0

Views: 77

Answers (1)

Joshua Cheek
Joshua Cheek

Reputation: 31726

Symbol#to_proc will give you what you want:

t = Trial.includes(:results).find(<id>) # <-- use includes to avoid having to requery for results
[:collumn1, :collunn2, :collumn3].each do |collumn_name|
  data = t.results.collect &collumn_name
  # whatevs
end

Upvotes: 1

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