The problem with using mongoose to store data is that I did not report an error, but I did not save the data and could not find the problem.
Before, when trying to store, a warning popped up:
Said that the promise will be removed and asked me to insert it into my Promise library.
Then, the stored logic is
NewComment is the data to be stored, cb and fb are callback functions after success and failure
However, because it has not been stored, I did not call it first.
DAO is like this
After exporting the newly created model, the storage logic is implemented
The reason is not asynchronous
But on schema.pre
Next () must be called before storage