what is fully-fledged promise












4















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







share|improve this question























  • "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


















4















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







share|improve this question























  • "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
















4












4








4


1






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







share|improve this question














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






share|improve this question













share|improve this question











share|improve this question




share|improve this question










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 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



















"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














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.






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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.






    share|improve this answer




























      4














      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.






      share|improve this answer


























        4












        4








        4







        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.






        share|improve this answer













        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.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 25 '18 at 18:01









        T.J. CrowderT.J. Crowder

        684k12112121307




        684k12112121307






























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