Defining factories in ExMachina. Some ideas

factory.ex

# This is a bit more flexible. Worried people will try to call it directly :S
# Also throws warnings if you put functions in between the function definitions
def factory(:user, attrs) do
  %User{
    first_name: "Paul"  ,
    last_name: "Smith"
    email: put_new_email(attrs)
  }
end

factory :user do
  %User{
    first_name: "Paul",
    last_name: "Smith"
  }
end

def build(:user, attrs \\ []) do
  do_build(:user, put_new_email(attrs))
end

def create(:user, attrs \\ []) do
  do_create(:user, attrs) |> add_settings
end

defp put_new_email(attrs) do
  Map.put_new(attrs, :email, attrs.first_name <> "@foo.com")
end