problems with "surface.find_entities_filtered"

[McGuten]

Hey guys i have a little problem with surface.find_entities_filtered.

I have that code:

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local foundProxies = surface.find_entities_filtered{area = {{wagon.position.x - 3, wagon.position.y - 3}, {wagon.position.x + 3, wagon.position.y + 3}}, name = "proxyType"}

And it give me a text error: attempt to index local 'surface' (a nil value)
That is in the line 549 from control.lua, but in lines 289, 312, 336, 531 and 549
Someone know how to fix it?

Thanks you all ^^

[orzelek]

Short answer - adding parameter to function without sending it there makes it a nil.

Long answer - you need to figure out whats the surface not just add it as parameter
If wagon is an entity it has it's surface accessible from surface member - try using wagon.surface instead of adding parameter to the function.

[McGuten]

wow, it work fine

but only in lane 549, lane 289 its for create a rail powered, and it isnt work with that...

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	local staticProxyOwners = surface.find_entities_filtered{area = {{position.x - 0.5, position.y - 0.5}, {position.x + 0.5, position.y + 0.5}}}

[orzelek]

wow, it work fine

but only in lane 549, lane 289 its for create a rail powered, and it isnt work with that...

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	local staticProxyOwners = surface.find_entities_filtered{area = {{position.x - 0.5, position.y - 0.5}, {position.x + 0.5, position.y + 0.5}}}

You are calling it on line 37 without giving it any surface so it's nil the function.
Since it's on_tick might be hard to get a hold of surface there.
You can use this one:

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local surface = game.surfaces['nauvis']

This line will give you base planetary surface. No idea what will happen when we move to 0.13 and up but works for now.

[ratchetfreak]

or loop over all surfaces

however if you got that position from an entity then grab the entities surface

[McGuten]

Well, it work now ^^

now show me other error, about equals... now doesnt exist, what function I should use?

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if wagonData.wagon ~= nil and wagon ~= nil and wagonData.wagon.equals(wagon) then

[ratchetfreak]

Well, it work now ^^

now show me other error, about equals... now doesnt exist, what function I should use?

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if wagonData.wagon ~= nil and wagon ~= nil and wagonData.wagon.equals(wagon) then

use ==:

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if wagonData.wagon ~= nil and wagon ~= nil and wagonData.wagon == wagon then

[McGuten]

Thanks you all ^^