what is fully-fledged promise
I was going through the mongoose docs when I Stumbled upon the line saying
Mongoose queries are not promises. They have a .then() function for co
and async/await as a convenience. If you need a fully-fledged promise,
use the .exec() function.
With this example
var query = Band.findOne({name: "Guns N' Roses"});
assert.ok(!(query instanceof Promise));
// A query is not a fully-fledged promise, but it does have a `.then()`.
query.then(function (doc) {
// use doc
});
// `.exec()` gives you a fully-fledged promise
var promise = query.exec();
assert.ok(promise instanceof Promise);
promise.then(function (doc) {
// use doc
});
Now, I didn't get what they meant when they said fully-fledge promise, like for me .then() should be a promoise and then it also allows async and await.
So can someone please explain me what does fully-fledge promise mean?
Reference link: https://mongoosejs.com/docs/promises.html#queries-are-not-promises
javascript node.js mongoose
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
add a comment |
I was going through the mongoose docs when I Stumbled upon the line saying
Mongoose queries are not promises. They have a .then() function for co
and async/await as a convenience. If you need a fully-fledged promise,
use the .exec() function.
With this example
var query = Band.findOne({name: "Guns N' Roses"});
assert.ok(!(query instanceof Promise));
// A query is not a fully-fledged promise, but it does have a `.then()`.
query.then(function (doc) {
// use doc
});
// `.exec()` gives you a fully-fledged promise
var promise = query.exec();
assert.ok(promise instanceof Promise);
promise.then(function (doc) {
// use doc
});
Now, I didn't get what they meant when they said fully-fledge promise, like for me .then() should be a promoise and then it also allows async and await.
So can someone please explain me what does fully-fledge promise mean?
Reference link: https://mongoosejs.com/docs/promises.html#queries-are-not-promises
javascript node.js mongoose
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
"like for me.then()should be a promise" - but what if there is athenbut it's not a promise? We call that a thenable.
– Bergi
Nov 25 '18 at 18:26
add a comment |
I was going through the mongoose docs when I Stumbled upon the line saying
Mongoose queries are not promises. They have a .then() function for co
and async/await as a convenience. If you need a fully-fledged promise,
use the .exec() function.
With this example
var query = Band.findOne({name: "Guns N' Roses"});
assert.ok(!(query instanceof Promise));
// A query is not a fully-fledged promise, but it does have a `.then()`.
query.then(function (doc) {
// use doc
});
// `.exec()` gives you a fully-fledged promise
var promise = query.exec();
assert.ok(promise instanceof Promise);
promise.then(function (doc) {
// use doc
});
Now, I didn't get what they meant when they said fully-fledge promise, like for me .then() should be a promoise and then it also allows async and await.
So can someone please explain me what does fully-fledge promise mean?
Reference link: https://mongoosejs.com/docs/promises.html#queries-are-not-promises
javascript node.js mongoose
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
I was going through the mongoose docs when I Stumbled upon the line saying
Mongoose queries are not promises. They have a .then() function for co
and async/await as a convenience. If you need a fully-fledged promise,
use the .exec() function.
With this example
var query = Band.findOne({name: "Guns N' Roses"});
assert.ok(!(query instanceof Promise));
// A query is not a fully-fledged promise, but it does have a `.then()`.
query.then(function (doc) {
// use doc
});
// `.exec()` gives you a fully-fledged promise
var promise = query.exec();
assert.ok(promise instanceof Promise);
promise.then(function (doc) {
// use doc
});
Now, I didn't get what they meant when they said fully-fledge promise, like for me .then() should be a promoise and then it also allows async and await.
So can someone please explain me what does fully-fledge promise mean?
Reference link: https://mongoosejs.com/docs/promises.html#queries-are-not-promises
javascript node.js mongoose
javascript node.js mongoose
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
asked Nov 25 '18 at 17:59
NoobieSatanNoobieSatan
1,202530
1,202530
"like for me.then()should be a promise" - but what if there is athenbut it's not a promise? We call that a thenable.
– Bergi
Nov 25 '18 at 18:26
add a comment |
"like for me.then()should be a promise" - but what if there is athenbut it's not a promise? We call that a thenable.
– Bergi
Nov 25 '18 at 18:26
"like for me
.then() should be a promise" - but what if there is a then but it's not a promise? We call that a thenable.– Bergi
Nov 25 '18 at 18:26
"like for me
.then() should be a promise" - but what if there is a then but it's not a promise? We call that a thenable.– Bergi
Nov 25 '18 at 18:26
add a comment |
1 Answer
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That means that the values returned by queries are thenables per the definition of the Promises/A+ spec, but not actual Promise instances. That means they may not have all of the features of promises (for instance, catch and finally methods). Actual Promise instances would be "fully-fledged" promises.
The English term "fully-fledged" means "complete" or "fully developed." It comes from ornithology (or at least, terminology related to birds): A chick (a young bird) that has its adult feathers is "fledged;" if it has all its adult feathers completely covering its down undercoat, it's fully-fledged.
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
add a comment |
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That means that the values returned by queries are thenables per the definition of the Promises/A+ spec, but not actual Promise instances. That means they may not have all of the features of promises (for instance, catch and finally methods). Actual Promise instances would be "fully-fledged" promises.
The English term "fully-fledged" means "complete" or "fully developed." It comes from ornithology (or at least, terminology related to birds): A chick (a young bird) that has its adult feathers is "fledged;" if it has all its adult feathers completely covering its down undercoat, it's fully-fledged.
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
add a comment |
That means that the values returned by queries are thenables per the definition of the Promises/A+ spec, but not actual Promise instances. That means they may not have all of the features of promises (for instance, catch and finally methods). Actual Promise instances would be "fully-fledged" promises.
The English term "fully-fledged" means "complete" or "fully developed." It comes from ornithology (or at least, terminology related to birds): A chick (a young bird) that has its adult feathers is "fledged;" if it has all its adult feathers completely covering its down undercoat, it's fully-fledged.
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
add a comment |
That means that the values returned by queries are thenables per the definition of the Promises/A+ spec, but not actual Promise instances. That means they may not have all of the features of promises (for instance, catch and finally methods). Actual Promise instances would be "fully-fledged" promises.
The English term "fully-fledged" means "complete" or "fully developed." It comes from ornithology (or at least, terminology related to birds): A chick (a young bird) that has its adult feathers is "fledged;" if it has all its adult feathers completely covering its down undercoat, it's fully-fledged.
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
That means that the values returned by queries are thenables per the definition of the Promises/A+ spec, but not actual Promise instances. That means they may not have all of the features of promises (for instance, catch and finally methods). Actual Promise instances would be "fully-fledged" promises.
The English term "fully-fledged" means "complete" or "fully developed." It comes from ornithology (or at least, terminology related to birds): A chick (a young bird) that has its adult feathers is "fledged;" if it has all its adult feathers completely covering its down undercoat, it's fully-fledged.
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
answered Nov 25 '18 at 18:01
T.J. CrowderT.J. Crowder
684k12112121307
684k12112121307
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"like for me
.then()should be a promise" - but what if there is athenbut it's not a promise? We call that a thenable.– Bergi
Nov 25 '18 at 18:26