Manipulating objects inside for loop

[EnriAlea]

Hello,

I'm struggling with these two cases, inside nested loops I can't update directly the object, nor checking for the array that I'm populating.
Note that ALL_PRODUCTS, ALL_VARIANTS, ALL_SKU are all HubDb table rows.

Are there any workaround? I need to update the top object in the hierarchy, based on properties that are present in nested children objects.

{% set PRODUCTS = [] %}
{% for product in ALL_PRODUCTS %}
  {% for v in ALL_VARIANTS %}
    {% if v.idproduct == product.id_ls %}
      {% for s in ALL_SKU %}
        {% if s.idvariant == v.id_ls and s.publishing != 'n' %}
          {# TRYING TO UPDATE DIRECTLY THE OBJECT I'M LOOPING THROUGH, DOESN'T WORK #}
          {% do product.update({'batterie_input': s.batterie_input}) %}

          {% do PRODUCTS.append(product) %}
          
          {# TRYING TO CHECK THE UPDATED ARRAY AFTER APPEND, DOESN'T WORK, IT ONLY WORKS AFTER THE LOOP HAS FINISHED #}
          {{ PRODUCTS }}
        {% endif %}
      {% endfor %}
    {% endif %}
  {% endfor %}
{% endfor %}

[GiantFocal · Accepted solution]

Hi @EnriAlea,

When working with nested loops in HubL, there are two main limitations:

1. Direct object updates inside loops are not supported
2. Array checks during loop iteration are not possible until after the loop completes

To work around these limitations, you can try:

1. Create new objects instead of modifying existing ones
2. Collect all necessary data first, then process it outside the loops
3. Use intermediate arrays to store temporary results

For example:

{% set PRODUCTS = [] %}
{% set temp_product = {} %}
{% for product in ALL_PRODUCTS %}
  {% do temp_product.update(product) %}
  {# Collect modifications in temporary object #}
  {% do PRODUCTS.append(temp_product) %}
{% endfor %}

[EnriAlea]

Hi!

your suggestion does the trick, but I have to create the temp object inside the first loop.

Thx!

Enrico

[Jaycee_Lewis]

Hey, @EnriAlea 👋 This is the expected outcome based on how HubL doesn't allow direct updates on objects inside loops. Have you looked into:

• Creating a temporary copy, e.g. `product_copy` to update in the nested loops
• Use `merge` to ass properties
• Append `product_copy` to PRODUCTS outside your inner loops

If you've already gone down this road, please let me know, and we can try tagging in a few champions who have HubL experience.

Thanks! — Jaycee