I execute Lua under Redis. I face an issue which is that I can't use a string as an array key. My coding is like following, and we found that mytable["wow"] is discarded:
FileName: hget.lua
local mytable = {}
mytable[1]= "Lua"
mytable["wow"] = "Tutorial"
return mytable
Command:redis-cli --eval hget.lua
Result returned is:
1) "Lua"
You CANNOT have a string key for the table, if you want to return the table to Redis.
Redis takes the returned table as an array, whose index starting from 1. It discards other elements of the table whose keys are NOT integers. In your case, i.e. mytable["wow"] = "Tutorial", since the key is a string, Redis ignores this element.
Also, the indexes must be sequential, otherwise, Redis discards some elements. Take the following as an example:
local t = {}
t[1] = "1" -- OK
t[2] = "2" -- OK
t[4] = "4" -- since index 3 is missing, this element will be discarded
t["string_key"] = "value" -- since the key is string, this element will be discarded
return t
Result:
./redis-cli --eval t.lua
1) "1"
2) "2"
