Factorio Forums

Hello, trying to get this to work in data-final stage :
if not data.raw.resource.category == "basic-fluid" then

want to do some operations on all resources except OIL/all fluid ones
could someone correct above statement, i cant get it to work

But be aware that other mods may introduce more categories.

thanks for reply but im sorry, turns out i need that category check inside control.lua stage.. is it even possible?

Yes, if you have a reference to a resource entity you can check `entity.prototype.resource_category`.

Thanks you.
How people figure out the syntax is beyond me..
I looked at api factorio and found it, then proceeded trying:
entity.prototype.resource-category
entity.prototype.resource.prototype
entity.resource.category
and so on
but ofcourse couldn't get it to work

this worked for me:
for _, resource in pairs(resources) do
if resource.prototype.resource_category ~= "basic-fluid" then

Re. “How people figure out the syntax”. It's important to distinguish between how something (e.g. resource category) is defined and how it's used and also between data stage and control stage. You can access prototypes at both data stage (read/write) and control stage (read-only), but the syntax is different. Data stage API is documented at https://wiki.factorio.com/Prototype_definitions. Control stage API is documented at https://lua-api.factorio.com/latest/index.html.

For example in case of a resource category:

• It is defined in data stage and has type “resource-category”, as shown in https://wiki.factorio.com/Prototype/ResourceCategory (on top of the page)
• It is used in data stage in ResourceEntity definition and the corresponding field is called “category”, as shown in https://wiki.factorio.com/Prototype/ResourceEntity
• It can be accessed in control stage given a LuaEntityPrototype, and the corresponding field is called “resource_category”, as shown in https://lua-api.factorio.com/latest/Lua ... otype.html