The Operation cannot accept arguments

[Mrs. Mac]

Hello All,

I am new at this.  I created a firedatabase that accepts a State and a percentage of the State.  The Dat gets stored then I can display it.  No Problem.  However I want to add a number to my Tag's Value and I get the String Problem . I know I am doing something ridiculous but can you help me.

[Evan Patton]

It's tough to tell, but here's my thought:

1. In the store method, you store the value "" in the key named by the state variable

2. This will trigger the Firebase DataChanged event, where you check the value of the tag against the state, and since that's probably still true from the previous step, then it will store the value (which was the empty string) into the percentage field.

3. Now, when you click the button to add 2 percent, percentage is now the empty string, resulting in your error.

To confirm, you might want to have the store value function store the value 0 rather than the empty string, or adapt your logic in your DataChanged event to be more robust based on the type of data you're storing, e.g., by making the tag include more information or using the isnumber? and isstring? blocks depending on what you're trying to manipulate.

Cheers,

Evan

[Mrs. Mac]

Hi Evan,

I'm so glad you are willing to help me.  Please bare with me on a few problems.  When I make the Store Value a "0" the values gets stored in my database as a "0" In fact any number I put in there gets stored as that number.  I am using one of the blue math components to do this, I'm assuming thats right?  The I used the isnumber? and String? together and separately I still get the problem.

Any other suggestions?

Thanks

Deb

[ABG]

You haven't shown us all your blocks.

In a blank space in the Blocks Editor,

do a right click Download Blocks As Image

and post your blocks.png file here.

The + block, like other math blocks,

is finicky, rejecting empty text.

You can filter its input to avoid errors:

C = + (if is a number(A) then A else 0,

         (if is a number(b) then b else 0)

ABG

[Deborah MacNeil]

Dear ABG,

Thank you for helping attached are all my blocks.  I think I understand what you are talking about utilizing the if is a number.  I tried it and it sdid not work.  I used it on the changes data component and the 1800 button.  Any other suggestions.

Thanks you again

Deb

[ABG]

Attached is a plus procedure you can use instead of

the AI2 + block, to never crash.

You can copy it by importing the .aia file

and using the backpack to copy it

across projects.

But never crashing doesn't insure correctness,

like in the 2% example,

since AI2 does not understand the meaning of %

and ignoring it by zeroing out everything is

quiet but inadequate.

ABG

[Mrs. Mac]

Thanks ABC, can't wait to try this.  I'll let you know if it works.