gistfile1.ex

# model
def field_names do
  __schema__(:field_names)
end


# controller
def create(conn, params) do                                                                                                                          
  Repo.insert struct(Model, permitted_params(params))                                                                                                  
  redirect conn, Routes.model_path(:index)                                                                                                             
end

def permitted_params(params) do                                                                                                                      
  Enum.reduce Model.field_names, [], fn field, acc ->                                                                                                
    [{field, Map.get(params, Atom.to_string(field))} | acc]                                                                                          
  end                                                                                                                                                
end