how to populate the _id of a collection in a Form in order to update the collection

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i use a button and connect it to a dataset as next-item and each field in the form is connected to a certain field in the collection, and i show one collection at a time.

  1. I cannot connect in the form the ID field as it is system field .

  2. how can i get the ID field without using the wixData.query(“mydata”) because I’m using the next-item field and I don’t want to change the hole logic of the page.

  3. after showing the fields of the current collection the user can change data and save it triggring a function using wixData.update(item{…}) but i dont have the _id and get an error.
    so i need the ID _id to use it to update the current collection.
    any help

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