Question

Documentation says Ohm lists are treated just like a Ruby array, but I see the following issues:

MyModel.new in rails console produces:

ArgumentError: wrong number of arguments (1 for 2)

That’s on a line where I have list :foo where foo should be an array of integers.

Then, to follow up, I wanted to create a unique index on attribute :bar and I get the following when I comment out the list method and add unique:

NoMethodError: undefined method `unique' for MyModel:Class

Here’s the class:

class MyModel < Ohm::Model
  attribute :email
  list :foo
  unique :email
end

This entire thing breaks down unless I comment out both the list and unique directives.

Answer 1

Are you looking for assert_unique?

class MyModel < Ohm::Model
  attribute :email
  index :email

  def validate
    assert_unique :email
  end
end