Help updating an array element

[ptpaterson]

You are on the right track! An array element cannot be updated in place; the whole thing does need to be modified and provided to the Update function.

Check out this previous topic:

How do I update an array item at a given index with the Update function?

Hey ! I believe you would still need to read the data before updating & use a custom function to update the array. I used this one ReplaceAtIndex as an UDF. Query( Lambda( ['docRef', 'index'], Update( Var('docRef'), Let( { currentBar: Select(['data', 'bar'], Get(Var('docRef'))) }, { bar: Call(Function('ReplaceAtIndex'), [Var('currentBar'), Var('index'), { baz: true }]) } ) ) )