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Is there an effective way to observe two nodes at once from firebase? Could you write sample code for it if possible?
Put call for the second node in the completionBlock of the first one:
For example i have my user's location coordinates(lat and lng) stored in two node's stored under my UserId:-
ref.child(FIRAuth.auth()!.currentUser!.uid).child("latitude").observeEventType(.Value, withBlock: {(SnapshotLAT) in
ref.child(FIRAuth.auth()!.currentUser!.uid).child("longitude").observeEventType(.Value, withBlock: {(SnapshotLNG) in
.....
.....
})
})
Maybe i could help you more if you posted your JSON structure here....
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What did I do wrong?
Thanks for the help
You need to return buildHome() in your default case like the other cases.
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In the quora answer: https://www.quora.com/How-many-number-of-address-lines-is-needed-for-processor-to-access-4MB-memory - the top answer starts with 1 address line giving you 2 bytes of data. But my question is how mathematically?
A single address line can be in one of two states - either in state 0 or 1, hence it is able to address two distinct locations.
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How can I create a member in a PDS using either JCL or REXX? The member's name must contain the actual date. Is that possible?
It can be done in JCL and by Rexx. You need to remember that member names are a maximum of 8 bytes and cannot start with a numeric so you would need to use something like the 'Julian' date e.g. 2017365. You may have system variables available to populate your JCL - check the JCL manual and level of Z/os that you are using.
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I have 3 FirDataSnapshot. When I am using observeEventType(.ChildAdded,..), it returns 3 item. When I use observeSingeEventTypeOf, it returns only 1 snapshot. I don't know why.
observeSingleEventType returns single value means it observe .childAdded only once ... the block is immediately canceled after the initial data is returned.
If you are using observeEventType than it gets all values from database ..
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How would you design a RESTful query to support OR and AND operand between parameters. Let's say my resource has three fields field1 & field2 &field3. How would you design the URL to enable the following query:
"Get myresources where field1=x OR field2=y AND field3=z"
I would probably encode a normal form (eg. CNF) of the relation between the fields somehow. For example:
http://myurl.com/get_myresources?field1=x&field2=y&field3=z&relationcnf=1OR2AND3