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Feathers.js: Hook functions

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Julien Le Coupanec 2018-02-04 16:09:52 +00:00
parent caaa62d139
commit 2cd1e38b0e
1 changed files with 37 additions and 10 deletions
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47
backend/feathers.js
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@ -93,26 +93,53 @@ myService.removeListener(eventname, [ listener ]) // removes all listeners (or
// Hooks are pluggable middleware functions that can be registered
// before, after or on errors of a service method. You can register a
// single hook function or create a chain of them to create complex work-flows.
app.service('messages').hooks({
app.service('my-service').hooks({
before: {
create(context) {
context.data.createdAt = new Date();
},
all: [
// Use normal functions
function(context) { console.log('before all hook ran'); }
],
update(context) {
context.data.updatedAt = new Date();
},
find: [
// Use ES6 arrow functions
context => console.log('before find hook 1 ran'),
context => console.log('before find hook 2 ran')
],
patch(context) {
context.data.updatedAt = new Date();
}
async create (context) {
return context
},
},
after: {
all: [],
find: [],
get: [],
create: [],
update: [],
patch: [],
remove: []
},
// Here is an example for a very useful application hook that logs every service method error
// with the service and method name as well as the error stack
error(context) {
console.error(`Error in ${context.path} calling ${context.method} method`, context.error);
}
});
context.app // [read only] contains the Feathers application object
context.service // [read only] contains the service this hook currently runs on
context.path // [read only] contains the service name (or path) without leading or trailing slashes
context.method // [read only] contains the name of the service method (find, get, create, update...)
context.type // [read only] contains the hook type (one of before, after or error)
context.params // [writable] contains the service method parameters (including params.query)
context.id // [writable] contains the id for a get, remove, update and patch service method call
context.data // [writable] contains the data of a create, update and patch service method call
context.error // [writable] contains the error object that was thrown in a failed method call (only available in error hooks)
context.result // [writable] contains the result of the successful service method call (only available in after hooks)
context.dispatch // [writable and optional] contains a "safe" version of the data that should be sent to any client
/* *******************************************************************************************
* 2. TRANSPORT: Expose a Feathers application as an API server.