Using template data from JSON parsing in script

Configuration
1

Hi all,

I am currently struggling with passing some JSON data I have parsed to a script and then utilising that data for a service call.

Essentially, I am pulling data via the Emby API (via REST commands hard-coded into my configuration.yaml) and storing it in a response variable called json_data.

I am then attempting to use the following code to pull out a specific value from the json data and ideally load it into a input_text helper via the “Wait for Template” block and the following code:

{% for x in json_data.content %}
  {% if x.DeviceName == "Living Room" %}
    {% set input_text.emby_session_id = x.Id %}
  {% endif %}
{% endfor %}

The idea would then to create another REST command that uses the stored variable.

However, when testing this code I get the following:

TemplateRuntimeError: cannot assign attribute on non-namespace object

If I try this code:

{% for x in json_data.content %}
  {% if x.DeviceName == "Living Room" %}
    {% set DevId = x.Id %}
  {% endif %}
{% endfor %}
{{DevId}}

I get this error:

'DevId' is undefined

Can anyone help me with a way to break my data out of loop jail so I may use it for the rest of my script? Many thanks in advance!

2

A variable assigned a value inside a Jinja2 for-loop doesn’t retain the assigned value outside the loop.

You have to use namespace to define the variable prior to referencing it inside the for-loop.

{% set ns = namespace(DevId = '') %}
{% for x in json_data.content if x.DeviceName == "Living Room" %}
  {% set ns.DevId = x.Id %}
{% endfor %}
{{ns.DevId}}

On a separate note, a for can also support an if so your separate if-endif can be merged directly into the for.

There may be a way to replace the entire for-loop with a select statement but I would need to see the structure of the JSON data to confirm it’s feasible.

3

Hi Taras,

Thank you for your help! I really appreciate your assistance and feedback on how I can improve my code. I won’t take up more of your time by providing you with enough details for the select statement but might post the code here when I figure it out.

For those following a similar path, I essentially put the above code into the data of a service action to update an input_text helper and this allowed me to store my value in a helper.

1 Like