在DAML场景中，如何重用getParty？

Question

我正在编写多个场景，具有类似的设置：

test0 = scenario do
  bank <- getParty "Bank"
  alice <- getParty "Alice"
  -- ....
  assert True

test1 = scenario do
  bank <- getParty "Bank"
  alice <- getParty "Alice"
  -- ...
  assert True

林特建议我减少重复：

 /Foo.daml:5:3: Suggestion: Reduce duplication
  Found:
  bank <- getParty "Bank"
  alice <- getParty "Alice"
  assert True
  Perhaps:
  Combine with /Users/shaynefletcher/Foo.daml:11:3

如何从场景中提取设置？

Answer 1

从Shayne F那里得到了答案：

parties = do
  bank <- getParty "Bank"
  alice <- getParty "Alice"
  return (bank, alice)

test0 = scenario do
  (bank, alice) <- parties
  -- ....
  assert True

test1 = scenario do
  (bank, alice) <- parties
  -- ...
  assert True

为清楚起见，parties的类型签名为：

parties : Scenario (Party, Party)