Calling math filters on rating field in metaobject results in incorrect output

[driesrobeyns]

I have created a metaobject with a "rating" field. When I iterate over the metaobject_list in my section I see the expected data. However when I try calling a math filter on rating.value, it will return 0. Calling the same math filter on scale_min/scale_max values inside the same metaobject will yield the correct values.

Here is an example of calling a round filter on rating.value in a metaobject_list for loop:

  {% assign rating = item.rating  %}
    Rating metafield: {{ rating }}<br>
    Rating value: {{ rating.value}}<br>
    Rating scale min: {{ rating.value.scale_min }}<br>
    Rating scale max: {{ rating.value.scale_max }}<br>
    Rating round: {{ rating.value | round }}<br>
    Rating scale min round: {{ rating.value.scale_min | round }}<br>
    Rating scale max round: {{ rating.value.scale_max | round }}<br>

Output:
Rating metafield: {"scale_min":"1.0","scale_max":"5.0","value":"4.5"} // As expected
Rating value: 4.5 // As expected
Rating scale min: 1.0 // As expected
Rating scale max: 5.0 // As expected
Rating round: 0 **Wrong! Should be 5**
Rating scale min round: 1 // As expected
Rating scale max round: 5 // As expected

Steps to recreate:

1. Create a metaobject with a rating field
2. Create entry for said object
3. Read object in liquid and try using math filter on rating.value

Using {{ rating.value | plus: 0 | round }} to force a conversion to interger results in the same incorrect output.

It is strange that scale_min/max results in the correct value but value does not, give the all have the same type in the metafield.

[graygilmore]

Hey @driesrobeyns, this is a tricky one! It's because when you call rating.value | round you're trying to round the entire object. Note that when you try scale_max you're writing rating.value.scale_max | round. What you need to do here is write rating.value.value | round.

Let me know if works for you 😄