NewsPublish | News release system - # # # # 开发环境:JDK1 | Object-Relational Mapping library
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kandi X-RAY | NewsPublish Summary
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QUESTION
In RxJava 3, is there a way to subscribe a Subscriber
to a Subject
?
Subject is an Observable
too which means it should be able to provide an upstream which others (Subscriber
implementations like DisposableSubscriber
or DefaultSubscriber
) should be able to get data when Subject's onNext
emits something. But below code gives compile-time error and I couldn't find any other mechanism to achieve that.
ANSWER
Answered 2020-Jul-10 at 00:21Update:
Decided to try the code by myself and found a kind of a workaround. Using lambda one can chain the onNext() method. The lambda istelf is an anonymus Consumer object, thus it may defeat the purpouse of the whole class (or not? depends on what else are you doing), but this works.
QUESTION
I'm trying to add an image to firebase storage and also add data to firestore with the image URL. The image is uploading to firebase storage, but it's not returning the URL if I use getDownloadUrl method. It gives back this error:
Uncaught TypeError: Cannot read property 'getDownloadURL' of undefined
This is how I get input and store the data:
...ANSWER
Answered 2020-Apr-06 at 21:56You're not working with the Firebase Storage API correctly. First, this line:
QUESTION
I have two tables News
and Comments
. The Comments
table has two foreign key columns UserId
and NewsId
.
When I get a News
item by id in Entity Framework Core, comments are null.
News model class:
...ANSWER
Answered 2019-Jul-26 at 14:46In EF if you are set by default with eager loading so you need to include the model property of the relationship like so :
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