error reading home table in qa

[Jay Ess 6]

HC3

I have a small table which i store in a global varibale, this is the table.

--Construct Music Table

jsonMusic = {

    Song = {

        S1 = "SholomAleichem", 

        S2 = "KohEchsoif",

        S3 = "JoyShabbos",

        S4 = "ItsTimeToSayGoodShabbos",

        S5 = "Hamavdil",

    }, 

    Length = {

        S1 = 401, --6.41,

        S2 = 483, --8.03,

        S3 = 256, --4.16,

        S4 = 267, --4.27,

        S5 = 332, --5.32

    }

}

--END OF MUSIC TABLE

fibaro.setGlobalVariable("jMusicTable", json.encode(jsonMusic))

 

from a scene i can reference the table and get the values i need.

eg. local jMT = json.decode(fibaro.getGlobalVariable("jMusicTable"))

and then songName = MusicPathPi.. jMT.Song.S1 ..MusicPathEnd

which get me the song i want to play.

 

however if i put this same code in a qa i get the following error:

/usr/share/lua/5.3/json/util.lua:55: bad argument #1 to 'for iterator' (table expected, got number)

 

this is the lines in my qa.

 

local jMT = json.decode(fibaro.getGlobalVariable("jMusicTable"))

    local songName = jMT.Song.S1

    print(songName)

 

 

What am I doing wrong?

[jgab 2,048]

9 minutes ago, Jay Ess said:

HC3

I have a small table which i store in a global varibale, this is the table.

--Construct Music Table

jsonMusic = {

    Song = {

        S1 = "SholomAleichem", 

        S2 = "KohEchsoif",

        S3 = "JoyShabbos",

        S4 = "ItsTimeToSayGoodShabbos",

        S5 = "Hamavdil",

    }, 

    Length = {

        S1 = 401, --6.41,

        S2 = 483, --8.03,

        S3 = 256, --4.16,

        S4 = 267, --4.27,

        S5 = 332, --5.32

    }

}

--END OF MUSIC TABLE

fibaro.setGlobalVariable("jMusicTable", json.encode(jsonMusic))

 

from a scene i can reference the table and get the values i need.

eg. local jMT = json.decode(fibaro.getGlobalVariable("jMusicTable"))

and then songName = MusicPathPi.. jMT.Song.S1 ..MusicPathEnd

which get me the song i want to play.

 

however if i put this same code in a qa i get the following error:

/usr/share/lua/5.3/json/util.lua:55: bad argument #1 to 'for iterator' (table expected, got number)

 

this is the lines in my qa.

 

local jMT = json.decode(fibaro.getGlobalVariable("jMusicTable"))

    local songName = jMT.Song.S1

    print(songName)

 

 

What am I doing wrong?

fibaro.getGlobalVariable returns 2 values - the value and the modification date (epoch)

That means that you send 2 value to json.decode.

Unfortunately, json.decode in QAs can take an second modifier parameter - but not a number - so it crashes.

Do like this

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An extra parenthesis around a multiple return value will only return the first value.

[Jay Ess 6]

thank you as always spot on and fixed

 

if i have a sub table how can i do a reverse lookup in the sub table to get the key from the value?

[jgab 2,048]

2 hours ago, Jay Ess said:

thank you as always spot on and fixed

 

if i have a sub table how can i do a reverse lookup in the sub table to get the key from the value?

You can do a "reverse lookup table"

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However, the limitation is that you can not have several keys mapping to the same value as the reverse will only preserve one of them.

 

Edited November 26, 2021 by jgab

[kieran00music 0]

Thank you once again, as usual spot on and resolved. 

What are the pros and cons of adding a sub-tables? What if I have a subs table? How may I perform a reverse lookup in the subs table in order to retrieve the key from the value?

And I found the best place to download free videos at 

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why not try it because it's free

Edited July 29, 2022 by kieran00music

[jgab 2,048]

Well, it depends. It's a slight overhead but it shouldn't really matter as we speak about milliseconds. 

If you program becomes clearer it is of value.

It could look something like this

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Note that you need unique leaf-values in the table as the table will be the key in the reverseMap

Output:

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Edited July 27, 2022 by jgab