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How to save API in my develop org with a double underscore
I just created an object based on the custom object and fields - when I try to save the API name as Trail___c, as described, it will not allow me to save the field with the double underscore.
I had the same issue, I just created an object and the API did not have a double underscore. I am trying to complete a Trailhead challenge and I keep getting the error because it is not double underscore.
I had the same problem. What I didn't know is that "__c" is appended to what ever I enter for that field. Per the instructions, I was trying to create the field with "__c".
I wasn't able to save the field when entered that way, so I did it with a single underscore. Of course, my work didn't pass the validation check. However, when I looked at the custom obejct, I noticed that the system had appended "__c" to my entry.
I went back and edited the fields and saved. This worked and allowed me to pass the validation.