Hooks, part 2
If you have an archive of stock movements, you cannot simply delete a stock item you no longer want to keep. You would not be able to properly present historical data if you did so.
The solution is to keep the data but mark it as deleted.
We can ignore the deleted flag when we know we are accessing historical, and possibly deleted, items.
Otherwise we want the application to act as if the item didn't exist.
It would be fairly complex to implement soft delete support yourself,
however its easy to do using the softDelete hook.
Working example
- Server code: examples/step/01/hooks/2.js
- Client code: common/public/rest-del.html and common/public/feathers-app-del.js
- Start the server:
node ./examples/step/01/hooks/2 - Point the browser at:
localhost:3030/rest-del.html - Compare with last page's server hooks/1.js.: Unified | Split
Using softDelete
We need to make just one change to our previous server example. We use the when hook to run the softDelete hook if the service method is not find.
const {
softDelete, when, // new
setCreatedAt, setUpdatedAt, unless, remove
} = commonHooks;
// ...
userService.before({
all: when(hook => hook.method !== 'find', softDelete()), // new
create: [ /* ... */ ]
});
The results
The browser console displays
created Jane Doe item
Object {email: "[email protected]", role: "admin", createdAt: "2017-05-31T08:41:48.640Z", updatedAt: "2017-05-31T08:41:48.640Z", _id: "CfLheOpJ3rve1IPh"}
created John Doe item
Object {email: "[email protected]", role: "user", createdAt: "2017-05-31T08:41:48.623Z", updatedAt: "2017-05-31T08:41:48.623Z", _id: "sQy34FUrDC8gJOUR"}
created Judy Doe item
Object {email: "[email protected]", role: "user", createdAt: "2017-05-31T08:41:48.641Z", updatedAt: "2017-05-31T08:41:48.641Z", _id: "eKNolHDBO6qXH2MU"}
created Jack Doe item
Object {email: "[email protected]", role: "user", createdAt: "2017-05-31T08:41:48.641Z", updatedAt: "2017-05-31T08:41:48.641Z", _id: "5iQCl2oDLbVXMfHo"}
deleted Jack Doe item
Object
email: "[email protected]",
role: "user",
deleted: true
createdAt: "2017-05-31T08:41:48.641Z",
updatedAt: "2017-05-31T08:41:48.641Z",
_id: "5iQCl2oDLbVXMfHo"
find all items
[Object, Object, Object, Object]
0: Object
email: "[email protected]"
role: "user"
password: "$2a$10$So9MhiVGW.P31CZnUefXXOcuacwKMm7nTgCAPSBZB9rO10how.X.G"
deleted: true
createdAt: "2017-05-31T08:41:48.641Z"
updatedAt: "2017-05-31T08:41:48.641Z"
_id: "5iQCl2oDLbVXMfHo"
1: Object
email: "[email protected]"
password: "$2a$10$TAz6SD6WxEostxvCNMOubuEY68pS8Jv9pLvrrgCiWTIOjIs3yIlO."
role: "admin"
createdAt: "2017-05-31T08:41:48.640Z"
updatedAt: "2017-05-31T08:41:48.640Z"
_id: "CfLheOpJ3rve1IPh"
2: Object
email: "[email protected]"
password: "$2a$10$GvUEJfPTQLGY8JKTuH8yeeML9auVLo1IGDVyGFOOImZ0Nuxtd7uji"
role: "user"
createdAt: "2017-05-31T08:41:48.641Z"
updatedAt: "2017-05-31T08:41:48.641Z"
_id: "eKNolHDBO6qXH2MU"
3: Object
email: "[email protected]"
password: "$2a$10$MX0LJerCfLoGx31mGh2x0eR7CyE2t2STeHhpcV9vYbpD3m8i8OZ.S"
role: "user"
createdAt: "2017-05-31T08:41:48.623Z"
updatedAt: "2017-05-31T08:41:48.623Z"
_id: "sQy34FUrDC8gJOUR"
length: 4
- The result returned when the Jack Doe item was deleted contains
deleted: true. - The results returned for find also contain
deleted: truefor Jack Doe because of how we conditioned the softDelete hook.