A-Corregidor

Polymorphic Relation - Wrong Doc

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### Describe the bug Hi there! Let's suppose a base Delivery model with 3 fields: id, deliverableType, and deliverableId. If you follow the [docs](https://loopback.io/doc/en/lb4/Polymorphic-relation.html), you'll get this error when requesting...

Filter by the concatenation of two columns

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## Suggestion It would be nice to be able to filter a Model by the concatenation of two columns. I mean, to be able to replicate this type of SQL...

Empty body on update generates an MySQL error

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## Steps to reproduce Generate a new project (ex: loopback example todo-list), change DB from memory objecto to MySQL, create MySQL database and config connector. Seed database with some data....

[BUG] Protected Worksheet Cant Be Sorted

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## 🐛 Bug Report When protecting a worksheet, it can't be sorted even when param sort is set to true Lib version: 4.3.0 ## Steps To Reproduce Create and protect...