dynamic variable name

[gjniewenhuijse]

i like to get data from a table, but the variable name is dynamic. See my example:

Code:

-- devices
devices = {
  {'9d', 'SENSOR', '8/4/5', 'v.hum'},
  {'9e', 'COMMON', '8/4/6', 'v.tst'}
}

-- data get from webservice
v = {hum=1, tst='abc'}
log(v.hum, v.tst)

-- print some data from v, based on data in devices
for k,k_items in pairs(devices) do
  -- log variable name
  log(k_items[4])
  -- log the data in variable with name k_items[4], for example the data in v.hum or v.tst (1 or abc)
end

[admin]

Like this, and make sure that v is defined before devices:

Code:

-- data get from webservice
v = {hum=1, tst='abc'}
log(v.hum, v.tst)

-- devices
devices = {
  {'9d', 'SENSOR', '8/4/5', v.hum},
  {'9e', 'COMMON', '8/4/6', v.tst}
}

-- print some data from v, based on data in devices
for k,k_items in pairs(devices) do
  -- log variable name
  log(k_items[4])
  -- log the data in variable with name k_items[4], for example the data in v.hum or v.tst (1 or abc)
end

[gjniewenhuijse]

Like this, and make sure that v is defined before devices:

Code:

-- data get from webservice
v = {hum=1, tst='abc'}
log(v.hum, v.tst)

-- devices
devices = {
  {'9d', 'SENSOR', '8/4/5', v.hum},
  {'9e', 'COMMON', '8/4/6', v.tst}
}

-- print some data from v, based on data in devices
for k,k_items in pairs(devices) do
  -- log variable name
  log(k_items[4])
  -- log the data in variable with name k_items[4], for example the data in v.hum or v.tst (1 or abc)
end

No thats not possible, because my devices are defined before i get the data from the webservice.
Now i defined v hardcoded, but normally this thats comes from the web and is parsed.

[admin]

Then do it like this:

Code:

-- devices
devices = {
  {'9d', 'SENSOR', '8/4/5', 'hum'},
  {'9e', 'COMMON', '8/4/6', 'tst'}
}

-- data get from webservice
v = {hum=1, tst='abc'}
log(v.hum, v.tst)

-- print some data from v, based on data in devices
for k,k_items in pairs(devices) do
  key = k_items[4]
  val = v[ key ]
  -- log variable name
  log(val)
  -- log the data in variable with name k_items[4], for example the data in v.hum or v.tst (1 or abc)
end

[gjniewenhuijse]

yeah.. thanks

---

i need the value 'attributes.soilHumidity.value'

how to do this in a nested table?

Code:

["type"]
  * string: SENSOR
["attributes"]
  * table:
   ["soilTemperature"]
    * table:
     ["timestamp"]
      * string: 2020-10-31T14:49:03.034+0000
     ["value"]
      * number: 13
   ["lightIntensity"]
    * table:
     ["timestamp"]
      * string: 2020-10-31T14:49:16.260+0000
     ["value"]
      * number: 7
   ["soilHumidity"]
    * table:
     ["timestamp"]
      * string: 2020-10-31T14:49:03.004+0000
     ["value"]
      * number: 100
   ["ambientTemperature"]
    * table:
     ["timestamp"]
      * string: 2020-10-31T14:49:17.023+0000
     ["value"]
      * number: 16
["relationships"]
  * table:
   ["device"]
    * table:
     ["data"]
      * table:
       ["type"]
        * string: DEVICE
       ["id"]
        * string: 40940964969046840
["id"]
  * string: 5647657567567567567

---

here my new example code

Code:

-- devices
devices = {
  {'9d', 'SENSOR', '8/4/5', 'attributes.soilHumidity.value'},
  {'9e', 'COMMON', '8/4/6', 'attributes.batteryLevel.value'}
}

-- data get from webservice
v = { attributes= { soilHumidity={value=1},batteryLevel={value=100} } }
log(v)
log(v.attributes.soilHumidity.value)
log(v.attributes.batteryLevel.value)

-- print some data from v, based on data in devices (dynamic)
for k,k_items in pairs(devices) do
  key = k_items[4]
  val = v[ key ]
  log(key, val)
end