add deletion check for containers

lib/cannery_web/views/error_helpers.ex

@@ -55,9 +55,10 @@ defmodule CanneryWeb.ErrorHelpers do
   end
 
   @doc """
-  Displays all errors from a changeset
+  Displays all errors from a changeset, or just for a single key
   """
   @spec changeset_errors(Changeset.t()) :: String.t()
+  @spec changeset_errors(Changeset.t(), key :: atom()) :: [String.t()] | nil
   def changeset_errors(changeset) do
     changeset
     |> changeset_error_map()
@@ -66,6 +67,10 @@ defmodule CanneryWeb.ErrorHelpers do
     end)
   end
 
+  def changeset_errors(changeset, key) do
+    changeset |> changeset_error_map() |> Map.get(key)
+  end
+
   @doc """
   Displays all errors from a changeset in a key value map
   """