ruby on rails rake db:seed undefined method for - ruby-on-rails

Question

I am trying to set up a basic user authentication - I have the user login stuff sorted and am up to adding roles for the user.
Essentially I want my Users to have many Roles, which gives them access to Rights.
I wrote some seed data but keep getting the error:
rake aborted!
undefined method `roles' for #<Array:0x007f8c0581ba80>
My seed data looks like:
#user
user = User.create!([{ email: 'admin#admin.com', first_name: 'Admin', last_name: 'Test', password: 'admin', password_confirmation: 'admin'}])
user.roles << admins = Role.create!(:name => "Admin")
#user roles
create = Right.create!(:resource => "users", :operation => "CREATE")
read = Right.create!(:resource => "users", :operation => "READ")
update = Right.create!(:resource => "users", :operation => "UPDATE")
delete = Right.create!(:resource => "users", :operation => "DELETE")
#add the roles to the admin
admins.rights << read
admins.rights << create
admins.rights << update
admins.rights << delete
rake db:migrate works fine and all table columns are as I expect them to. Just when I run rake db:seed it aborts with the above error. I understand what the error is saying - I just can't see where I am not defining the has_many to roles.
I have gone through the models very closely but can't seem to find what I have missed.
and my model files looks like this:
class User < ActiveRecord::Base
has_secure_password
has_many :assignments
has_many :roles, :through => :assignments
attr_accessible :email, :first_name, :last_name, :password, :password_confirmation
validates_presence_of :email, :on => :create
validates :password, :confirmation => true
validates :password_confirmation, :presence => true
validates_uniqueness_of :email
#will be using this later to check if the user has access to resources/actions
# def can?(action, resource)
# roles.includes(:rights).for(action, resource).any?
# end
end
class Role < ActiveRecord::Base
has_many :grants
has_many :assignments
has_many :users, :through => :assignments
has_many :rights, :through => :grants
scope :for, lambda{|action, resource|
where("rights.operation = ? AND rights.resource = ?",
Right::OPERATION_MAPPINGS[action], resource
)
}
end
class Right < ActiveRecord::Base
attr_accessible :operation, :resource
has_many :grants
has_many :roles, :through => :grants
OPERATION_MAPPINGS = {
"new" => "CREATE",
"create" => "CREATE",
"edit" => "UPDATE",
"update" => "UPDATE",
"destroy" => "DELETE",
"show" => "READ",
"index" => "READ"
}
end
class Grant < ActiveRecord::Base
attr_accessible :right_id, :role_id
belongs_to :role
belongs_to :right
end
class Assignment < ActiveRecord::Base
belongs_to :user
belongs_to :role
attr_accessible :role_id, :user_id
end
any help would be greatly appreciated.

Answer 1

You should not create one user as array of users. Try delete the square brackets in User.create!()
user = User.create!({email: 'admin#admin.com', first_name: 'Admin', last_name: 'Test', password: 'admin', password_confirmation: 'admin'})

Answer 2

Just ditch the []'s and {}'s in the first line, eg:
user = User.create!(email: 'admin#admin.com', first_name: 'Admin', last_name: 'Test', password: 'admin', password_confirmation: 'admin')