Rails: undefined method map, Using map inside model

Question

I'm trying to make a collection of items for options_for_select using map inside my model:

  def get_products
    Product.all.map { |product| [product.description,product.id] }
  end

However rails is giving the error:

undefined method `map' for :get_products:Symbol

Is not possible to use map inside models?

The code in the view is:

<%= f.select_tag :product_id, options_for_select(:get_products) %>

Update

Changing the code in the view to get_products instead of :get_products gives the error:

undefined local variable or method `get_products' for #<#:0xb189c770>

May we see the line where you are calling options_for_select? — patrickmcgraw
– patrickmcgraw, Commented Nov 29, 2012 at 20:59
All of the above works fine (returns an array of arrays); chances are it's how you reference it in the options_for_select that's causing the problem -- perhaps it should be get_products instead of :get_products? — Tom Harrison
– Tom Harrison, Commented Nov 29, 2012 at 21:01

patrickmcgraw · Accepted Answer · 2012-11-29 21:13:10Z

3

options_for_select expects a collection to be passed in and not a symbol. I'm fairly certain your error is coming from inside the Rails code and not your model.

Change #get_products to be a class method:

def self.get_products
  Product.all.map { |product| [product.description,product.id] }
end

And then in the view (assuming #get_products lives within a model called Product):

<%= f.select :product_id, options_for_select(Product.get_products) %>

edited Nov 29, 2012 at 21:13

answered Nov 29, 2012 at 21:06

patrickmcgraw

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2 Comments

KoU_warch Over a year ago

thank you very much, but shame on me there is no method select_tag for form_for. What should i do?

patrickmcgraw Over a year ago

@EH_warch I updated my answer. I don't think you need _tag just f.select

Magicmarkker · Accepted Answer · 2012-11-29 21:06:58Z

0

It should be something like this

<%= f.select_tag :product_id, options_for_select(Product.get_products) %>

answered Nov 29, 2012 at 21:06

Magicmarkker

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2 Comments

KoU_warch Over a year ago

Without adding the self to the method inside the model did not work

Magicmarkker Over a year ago

Yeah sorry thought you already had that, but I guess it was from @patricmcgraw's response

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