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that way you can later use entity.has_flag(your_flag)

Rseding91 wrote:I added LuaEntity::request_slot_count read for 0.13.13.

binbinhfr wrote:

Rseding91 wrote:I added LuaEntity::request_slot_count read for 0.13.13.

But will it be 0 on none-requester entities ? or will it trigger an error ? or at least return 0 on any logical-container that cannot request ?
because my initial purpose was to detect if any entity is a requester type.

Rseding91 wrote:It's 0 if the entity doesn't have request slots. No errors.

aubergine18 wrote:Is there something on the entity.prototype you could test for? Alternatively, could you scan all the prototypes in data.raw when game starts and for any that meet your criteria add a flag to the prototype - that way you can later use entity.has_flag(your_flag) to detect if the entity is the required type before attempting entity.get_request_slot()

While pcall() will certainly work, it seems a very laggy way of doing things as in many cases an error will occur internally within the pcall() resulting in a stack trace.

IMO best solution would be to have a new entity.has_request_slots added to the API as suggested by @Nexela

for _, inserter in pairs(data.raw["inserter"]) do
	if inserter.filter_count and inserter.filter_count > 0 then
		if not inserter.flags then inserter.flags = {} end
		table.insert(inserter.flags,"my_filter")
	end
end

binbinhfr wrote: Hi Aubergine,

did you ever try this ?
because trying to add a custom flag does not work for me :

Lua has unique strings, that means that each possible string exists only once within Lua. If a new string occurs Lua first checks if it already exists within the string pool. If it does, a reference to that older string is used. If it does not exist, a new string object is created and put into the string pool. The GC checks the string pool for unused strings and frees them.

Would it be possible to get a .tags property on prototypes (and corresponding .has_tag() method on entities for lazy evaluation) so we can create custom folksonomies?