Updated source's friendly_name to default to the collection_name (#29)

lib/pinchflat/utils/changeset_utils.ex

@@ -0,0 +1,19 @@
+defmodule Pinchflat.Utils.ChangesetUtils do
+  @moduledoc """
+  Utility methods for working with changesets
+  """
+
+  import Ecto.Changeset
+
+  @doc """
+  Sets the default value of a field if it is nil by applying the given function.
+
+  Returns %Ecto.Changeset{}.
+  """
+  def dynamic_default(changeset, key, value_fn) do
+    case get_field(changeset, key) do
+      nil -> put_change(changeset, key, value_fn.(changeset))
+      _ -> changeset
+    end
+  end
+end