I'm trying to use cequel-devise with... Devise ^^

I have a User model:

# -*- encoding : utf-8 -*-
class User
  include Cequel::Record

  devise :database_authenticatable, :registerable

  key :email, :varchar
  column :username, :varchar
  column :encrypted_password, :varchar
  timestamps
end

Partitioning with the email seemed to me the best way to integrate with Devise, which will be able to efficiently look for a user by email.

Signing up goes well, but when I try to log in, I end up with the following error:

NoMethodError: undefined method `first' for #<User email: "username@email.com">

The error is located here: orm_adapter-cequel (1.0.1) lib/cequel/record/orm_adapter.rb:61:in 'find_first'.

From what I've gathered, find_first tries to build a scope using the given options to query the DB and to get the first record by calling first on that scope.

scope is assigned the following values:

• scope = klass.all #=> User
• scope = apply_secondary_index_scope(scope, conditions) || apply_primary_key_scope(scope, conditions) #=> User['username@email.com'] => #<User:0x007f8bc4d0e6c8>

conditions only contains an email key with value username@email.com. In the second step, this resolves to applying this key as a "primary key scope", which ends up restricting the scope to a single User instance.

I guess it's because of this behavior of #[] (from cequel/cequel:lib/cequel/record/record_set.rb):

    # If {#[]} is used successively to specify all of the columns of a primary
    # key, the result will be a single {Record} or a {LazyRecordCollection},
    # depending on whether multiple values were specified for one of the key
    # columns. In either case, the record instances will be unloaded.

Because of my relational-like table, where a partition key (email) always maps to a single User instance, #[] will always return a single Record instance.
I guess find_first should call first on the returned scope only if scope is an instance of RecordSet?