MIssing unique key on eav_attribute_label table

[tzyganu]

Summary (*)

Magento 2.4-develop

The table eav_attribute_label should contain a unique key constraint on the (store_id, attribute_id) pair.
Version:

• Identified on 2.3.2 Magento Open Source
• Checked table structure for version 2.2.6, key is still missing.
• Didn't check versions prior to 2.2.6, but most probably it has been there since the beginning of time.

Also layered navigation disappears on frontend.

Relates issues:
#24581
#24718

Steps to reproduce:

1. Create a product with any attribute;
2. Open eav_attribute_label and add a new row with the same attribute_id and store_id values

3. Go to Storefront -> Product page

Actual Result: ✖️ Item with the same id already exists.

Expected Result: ✔️ should be notified that duplicate values cannot be created for these fields

Examples (*)

One (faulty?) 3rd party extension inserted something in the eav_attribute_label using insertOnDuplicate, but since there is no unique key on the table I ended up with duplicate pairs (store_id, attribute_id).
This resulted in "item with id X already exists" error when loading attribute labels

Proposed solution

Add a unique key constraint on the (store_id, attribute_id) pair.

        <constraint xsi:type="unique" referenceId="EAV_ATTRIBUTE_LABEL_ATTRIBUTE_ID_STORE_ID_UNIQUE">
            <column name="store_id"/>
            <column name="attribute_id"/>
        </constraint>

as a bonus, since this is becoming a unique index, the existing index on the store_id, attribute_id pair can be dropped

        <index referenceId="EAV_ATTRIBUTE_LABEL_ATTRIBUTE_ID_STORE_ID" indexType="btree">
            <column name="attribute_id"/>
            <column name="store_id"/>
        </index>

[m2-assistant]

Hi @tzyganu. Thank you for your report.
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@tzyganu do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

Hi @engcom-Charlie. Thank you for working on this issue.
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[engcom-Charlie]

Hello @tzyganu !
Could you add any steps?

[tzyganu]

@engcom-Charlie Steps to what?
There are no steps. There is just an explanation.
One attribute should only have one single label on one store view. But the eav_attribute_label allows multiple labels for the same attribute for a single store view.
This can lead to errors when loading an attribute collection.
I know that duplicate labels cannot happen via admin UI, but it can still happen. (happened to me).
A simple unique key should prevent this.

[magento-engcom-team]

@engcom-Charlie Thank you for verifying the issue.

Unfortunately, not enough information was provided to acknowledge ticket. Please consider adding the following:

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Once all required information is added, please add label "Issue: Confirmed" again.
Thanks!