[英]How to avoid repetition of .then() and .catch() after $http requests?
I have a simple userAPI service in my angular app: 我的角度应用程序中有一个简单的userAPI服务:
app.service('userAPI', function ($http) {
this.create = function (user) {
return $http
.post("/api/user", { data: user })
.then(function (promise) { return promise.data })
.catch(function (error) { return error.data })
}
this.read = function (user) {
return $http
.get("/api/user/" + user.id)
.then(function (promise) { return promise.data })
.catch(function (error) { return error.data })
}
this.update = function (user) {
return $http
.patch("/api/user/" + user.id, { data: user })
.then(function (promise) { return promise.data })
.catch(function (error) { return error.data })
}
this.delete = function (user) {
return $http
.delete("/api/user/" + user.id)
.then(function (promise) { return promise.data })
.catch(function (error) { return error.data })
}
})
As you can see, i am repeating same .then() and .catch() functions after each of my $http requests. 如您所见,我在每个$ http请求之后重复相同的.then()和.catch()函数。 Ho can i avoid this repitition according to DRY principle?
我怎样才能根据DRY原则避免这种重新分配?
Why not just write the functions once and apply them to each callback in the service? 为什么不只编写一次函数并将它们应用于服务中的每个回调呢?
Something like: 就像是:
app.service('userAPI', function ($http) {
var success = function (response) { return response.data; },
error = function (error) { return error.data; };
this.create = function (user) {
return $http
.post("/api/user", { data: user })
.then(success, error);
}
this.read = function (user) {
return $http
.get("/api/user/" + user.id)
.then(success, error);
};
this.update = function (user) {
return $http
.patch("/api/user/" + user.id, { data: user })
.then(success, error);
};
this.delete = function (user) {
return $http
.delete("/api/user/" + user.id)
.then(success, error);
};
});
Also note you can use then(successcallback, errorcallback, notifycallback)
to shorten your code even further than using then/catch. 还要注意
then(successcallback, errorcallback, notifycallback)
与使用then / catch相比then(successcallback, errorcallback, notifycallback)
您可以使用then(successcallback, errorcallback, notifycallback)
缩短代码。
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