Can´t categorize field for unknown reason

Question

I am trying to categorize a field without any success

The values should be symbolized from 1-5 and yet, I just get that blank symbol.
at first I thought that the problem is that the column is defined as string, so I created a new number column and after updating to the original, I got an NULL column.
Iv'e created another string column and again I got a blank column .
A weird thing is that in the field calculators output preview, the original value appears as it should

I'm using QGIS 3.4.7 and I have the same issue in other versions as well

here's the way it  looks in the field calculator

Ian Turton · Answer

If you want to convert a String to an Integer you can't just copy it (as you see it just can't be done). You want to use the function to_int(switchboar) to make the conversion for you.

tristramit · Answer

Well, it seems like it cannot get the Values in Version 3.4.7 but I can get them in version 2.18.17 so, for now I guess I'll stick to that.
I'm using field caculator as shown

I must say that it's a partial answer so if anyone has a better, I would be glad to hear it

Can´t categorize field for unknown reason

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