set_filter implementation

[FlyHigh]

I'm trying to implement a rail wagon that is restricted to a certain type of ore but I'm a noob at lua.

I'm messing with the stainless steal wagon mod just as a base, and tried to insert the line close to the example on the Wiki.

Code: Select all

wagon.set_filter(2, 'iron-ore')

in the entities.lua script which, as far as I understand, is where this line should go.
However i'm getting a 12: attempt to call field 'set_filter' (a nill value).

Anyone care to shed some light on it for me? Thank you

[prg]

entities.lua sounds like something that would be required from data.lua, which is not the place to call this function. Not sure what "wagon" would be in this context here.

set_filter() needs to be called on an entity reference, like in an on_built_entity event handler in control.lua.