[Blockly] How to reference a field_variable

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1

In the process of developing a library to use my openhab-rules-tools library from Blockly I’ve encountered a problem I can’t solve from the tutorial nor the docs.

I have a block I’m trying to create that needs to create it’s own variable (kind of like a for loop has a variable). I can’t use a temporary variable (i.e. {{temp_name:desiredName[:realm]}}) for this because the users need to be able to reference the variable in a statements block.

I did discover field_variable which does exactly what I want (creates the variable, lets me rename it, variable shows up under “Variables”, the whole nine-yards.

However, I can’t figure out how to actually reference that variable in my code. Given.

        args0:
          - type: field_variable
            name: VAR_NAME
            variable: item

in my code I’ve tried:

Attempt Output
{{field:VAR_NAME}} :Qdtlf+vg4rV7iO!.0yX or some other random string, clearly a unique identifier of sorts (maybe the id field (per Variable fields  |  Blockly  |  Google for Developers)). It doesn’t make sense to use the ID though because “item” gets added as a variable to the top of the code. I need the field’s text.
{{input:VAR_NAME}} a space, which is interesting as if the input value is undefined it’s usually “null”, isn’t it?
{{variable:VAR_NAME}} /* Invalid placeholder type variable! */
{{variables:VAR_NAME}} /* Invalid placeholder type variables! */
{{var:VAR_NAME}} /* Invalid placeholder type var! */
{{vars:VAR_NAME}} /* Invalid placeholder type vars! */

Have I run into a feature that OH doesn’t support perhaps?

2

Hi,
only roughly tested
{{field:item}} ?

3

sadly I get null instead of the variable name.

6

Some more results from research.

Looking at the code and the JSON shown in the Advanced Blockly Playground (see below) the actual variable name which is what I need to access is stored in a separate Object in Blockly.

{
  "blocks": {
    "languageVersion": 0,
    "blocks": [
      {
        "type": "controls_forEach",
        "id": "HJ5_3bM=emwf-c6noKH;",
        "x": 212,
        "y": 338,
        "fields": {
          "VAR": {
            "id": "1K,V(0,NN!f9h$3DZCzN"
          }
        }
      }
    ]
  },
  "variables": [
    {
      "name": "j",
      "id": "1K,V(0,NN!f9h$3DZCzN"
    }
  ]
}

This is going to require a new replacement field (e.g. {{fieldvar:VAR_NAME}}) and adding the VariableMap to the Block that’s passed into the code that processes these.

See [Blockly] Support blocks that create variables · Issue #2324 · openhab/openhab-webui · GitHub.