What does .__index do?
local model = {}
model.__index = model
return model
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__index(table, index) : Fires when table[index] is indexed, if table[index] is nil. Can also be set to a table, in which case that table will be indexed.
Definition of index by merriam webster :
A list (as of bibliographical information or citations to a body of literature) arranged usually in alphabetical order of some specified datum (such as author, subject, or keyword)
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