Silent error
wilk opened this issue · comments
Hi,
I got a silent error with the following code:
search @session
student = [#student name]
randomNum = floor[value: random[seed: 10] * 100]
bind @browser
[#div text: "student: {{student.name}}"]
bind @view
// here lies the error that is student.value instead of student.name
[#value | value: "{{student.value}} {{randomNum}}"]
Nothing is displayed because of student.value.
I was expecting an error message somewhere, maybe just after the [#value] sentence, but nothing appeared.
Is it normal?
I'm using:
- Eve 0.2.3
- Chrome 55
- Mac OS X 10.11.6
Follows the gist: https://gist.github.com/anonymous/3ad9d378d37bb8c25647d6260aaac024
Wilk,
Yeah, this is normal, but probably deserves some explanation. By using student.value, you're conditioning the block on student.value being available. If it's not, then the block simply will not run. It's the same as if you did this:
search @session
student = [#student name value]
randomNum = floor[value: random[seed: 10] * 100]
bind @browser
[#div text: "student: {{student.name}}"]
bind @view
// here lies the error that is student.value instead of student.name
[#value | value: "{{value}} {{randomNum}}"]
Where instead of using student.value I'm searching explicitly for [#student name value]. The reason you can do both, is with the dot notation, you can write a condition for when there isn't a student.value to keep the block running:
search
student = [#student name]
value = if student.value then student.value
else 0
bind @view
[#value | value: "{{name}} {{value}}"]
This block says "search for all students with names. If they have a value, then use that. Otherwise, the value is 0."
Crystal clear, thank you!