[Rails] Getting null value when it's assigned

I have my articles migration

create_table :articles do |t|
t.integer :category_id, :null => false
etc..

and my form

Select a category
<%= f.select :category_id, Category.all.collect {|category|
[category.name, category.id ]} %>

But everytime im sending that info im getting a nil value for
category_id

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