CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4
Gabriel Baker
Gabriel Baker

Reputation: 1219

How to loop over model attributes and use them as symbols else where

I'm trying to loop over a the attr_accessor-able variables in an ActiveModel::Model and then fetch corresponding records from the db based on them, the problem is that it's not finding the record.

class DeployOptionForm
  include ActiveModel::Model
  attr_accessor :revision_number
end

And this is the code I was trying to get them.

dof.instance_variables.each do |var_sym|
  dof_var = dof.instance_variable_get(var_sym)
  var_sym.to_s.slice!(0).to_sym
  doe = DeployOption.new
  doe.value = dof_var
  doe.deploy_option_type = DeployOptionType.find_by name: var_sym
  doe.deploy = @deploy
  doe.save
end

I know that if I do
doe.deploy_option_type = DeployOptionType.find_by name: :revision_number
the record is found just fine but I'm trying to make it more adaptable.

So what do I need to do to var_sym to be able to do DeployOptionType.find_by name: var_sym ?

Upvotes: 0

Views: 75

Answers (2)

Gabriel Baker
Gabriel Baker

Reputation: 1219

Solved it!

Ended up having to do this

    var_sym = var_sym.to_s
    var_sym.slice!(0)
    var_sym = var_sym.to_sym

EDIT: Actually this is a better solution and does it in 1 line!

var_sym = var_sym.to_s.slice(1..-1).to_sym

Upvotes: 1

user229044
user229044

Reputation: 239491

var_sym.to_s.slice!(0).to_sym isn't doing anything. var_sym will be exactly what it was before you did all that.

You need var_sym = var_sym.to_s.slice(0).to_sym

Upvotes: 1

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