daml - DAML场景下，如何复用getParty？

Question

我正在编写多个具有类似设置的场景:

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

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

linter 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

得到 Shayne F 的答复:

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

为了清楚起见，各方的类型签名是:

parties : Scenario (Party, Party)