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007097b791
* Correct Cleanup example: Change OnSet to OnAdd `jecs.OnSet` no longer exists. This should be `jecs.OnAdd` instead, which does exist. * Clarify OnAdd hook in cleanup.luau Add comment to clarify OnAdd hook behavior
22 lines
878 B
Text
Executable file
22 lines
878 B
Text
Executable file
local jecs = require("@jecs")
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local world = jecs.World.new()
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local Model = world:component()
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-- It is important to define hooks for the component before the component is ever used
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-- otherwise the hooks will never invoke!
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world:set(Model, jecs.OnRemove, function(entity)
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-- OnRemove is invoked before the component and its value is removed
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-- which provides a stable reference to the entity at deletion.
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-- This means that it is safe to retrieve the data inside of a hook
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local model = world:get(entity, Model)
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model:Destroy()
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end)
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world:set(Model, jecs.OnAdd, function(entity, id, model)
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-- OnAdd is invoked after the data has been assigned.
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-- This hook only fires the first time the component is added.
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-- It also returns the data for faster access.
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-- There may be some logic to do some side effects on reassignments
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model:SetAttribute("entityId", entity)
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end)
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