AdrianKoszalka opened a new pull request, #31998:
URL: https://github.com/apache/superset/pull/31998
### SUMMARY
This PR introduces a new Handlebars helper, parseJson, which enhances the
functionality of Handlebars templates in Apache Superset. The helper allows the
processing of more complex data structures, such as arrays containing nested
arrays, by safely parsing JSON strings into JavaScript arrays
Usage Example:
Here’s an example that demonstrates how parseJson enables iteration over
nested arrays in Handlebars templates:
`data` object:
```
[
{
"category": "Fruits",
"items": ["Apple", "Banana", "Cherry"]
},
{
"category": "Vegetables",
"items": ["Carrot", "Broccoli", "Spinach"]
}
]
```
Handlebars template:
```
<div>
{{#each data}}
<h2>{{this.category}}</h2>
<ul>
{{#each (parseJson this.items)}}
<li>{{this}}</li>
{{/each}}
</ul>
{{/each}}
</div>
```
### TESTING INSTRUCTIONS
1. Create a Dataset
1.1. Navigate to the Datasets tab in Superset and create dataset containing
nested arrays. (You can use data from example)
2. Create a Handlebars Chart
2.1. Go to the Charts tab
2.2. Select + Chart, and choose Handlebars Chart.
2.3. Select the `Nested Array Dataset` and use the template from usage
example
3. Confirm the chart renders nested arrays as lists.
4. Test Pre-Change Behavior
4.1. Remove (parseJson) from the template and verify that list is not
properly handled.
### ADDITIONAL INFORMATION
<!--- Check any relevant boxes with "x" -->
<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
- [ ] Has associated issue:
- [ ] Required feature flags:
- [ ] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [X] Introduces new feature or API
- [ ] Removes existing feature or API
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