Hi,
I’m trying to CloudDeploy a little form that takes the name of a planet and returns the perihelion. Here’s the code.
planetDistance[a_]:=Module[{D},D=PlanetData[Entity["Planet", a], "Perihelion"]]
CloudDeploy[FormFunction[{"a"->"Planet"},planetDistance[#a]&,"GIF"]]
The function itself seem to work okay in the notebook…
planetDistance["Neptune"]
2.7710865×109mi
I get this message
Thank you.
vr/MB
Your function implicitly assumes the input will be a string; however, when you make a choice in your form “a” is returned as an entity and not as a string.
You need to reformulate your planetDistance function to operate on an entity rather than a string.
planetDistance[a_Entity] := PlanetData[a, "Perihelion"]
planetDistance[Entity["Planet", "Neptune"]]
Thank you, Emerson. This worked, and I think I understand why 
vr/MB