node.js承諾如何處理嵌套Promise中最高調用級別的錯誤

Question

我正在使用嵌套的Promise在before（）掛鉤中設置測試數據庫。 它運行良好，但我不知道如何捕捉最高級別的錯誤（在before（）鉤子中）。 展望中的console.log，在AA嵌套的承諾被逮住一個錯誤，它返回到以前的水平，值......不匹配..

group.test.js

before(() => { 
    return utils.clearCollections() 
    .then(() => { 
     return utils.createSuperAdmin() 
     .then(() => { 
      return utils.createTestGroups(3) 
      .then((insertedGroups) => { 
       groups = insertedGroups; 
       return utils.addRolesInGroups(groups) 
       .then((insertedRoles) => { 
        console.log('DONE ! %j', insertedRoles); 
       }) 
       .catch((e) => { 
        console.log('error %j', e); 
       }); 
      }); 
     }); 
    }); 
}); 

test.utility.js

export function addRolesInGroups(groups) { 
    ... 
    return Role.insertMany([roleA1, roleA2, roleA3, roleB2, roleB3, roleC3, role4 ]) 
     .then((insertedRoles) => { 
      console.log('Successfully created test roles in groups'); 
      return insertedRoles; 
     }) 
     .catch((e) => { 
      console.log('Error inserting many: %j', e); 
      return e; 
     }); 
} 

的console.log

的誤差在無極功能addRolesInGroups（） 但它返回到之前（主叫）掛鉤..沒有釣到corrrectly逮住......

Error inserting many: {"code":11000,"index":3,"errmsg":"E11000 
duplicate key error collection: cockpit-api-test.roles index: name_1 
dup key: { : \"manager\" }","op": "__v":0, 
"_groupId":"5954d45e05206235d308f4d6", 
"name":"manager","description":"can R group, can RW 
user","_id":"5954d45e05206235d308f4db","rolePermissions" 
[],"permissions":[{"resourceName":"group","authorizedActions" 
["read"]},{"resourceName":"user","authorizedActions" 
["read","write"]}],"users":[]}} 

DONE ! {"code":11000,"index":3,"errmsg":"E11000 duplicate key error 
collection: cockpit-api-test.roles index: name_1 
dup key: { : \"manager\" }","op" 
{"__v":0,"_groupId":"5954d45e05206235d308f4d6", 
"name":"manager","description":"can R group, can RW 
user","_id":"5954d45e05206235d308f4db","rolePermissions":[], 
"permissions":[{"resourceName":"group","authorizedActions":["read"]} 
{"resourceName":"user","authorizedActions":["read","write"]}] 
,"users":[]}} 

Answer 1

這是因爲你不重新 - 拋出緩存的錯誤，而是返回新的Promise，以解決緩存錯誤。 更改return e;到throw e;