Query Azure Cosmos for items that have all elements - azure

Question

Let's say I have couple sample items in my DB that look like this:
Example 1:
{
'id': 'someid',
'columns': ['apple', 'banana'],
'filters': {'car': 'red', 'truck': 'blue'}
}
Example 2:
{
'id': 'someid',
'columns': ['apple', 'banana', 'carrots'],
'filters': {'truck': 'blue', 'car': 'red', 'boat':'green'}
}
Fast forward to the present, I have a new set of columns and of filters that might look like:
newcolumns=['banana','apple'] and newfilters={'truck':'blue', 'car':'red'}
I want to do a query like
select *
from f
where f.columns=newcolumns and f.filters=newfilters
but I don't care about the order and they have to be a complete match. Neither set can be a super or subset of the other. So in this case my query should return example 1 but not example 2.
As a note, there are two parts to my question, the columns matching is answered by this but the filters field isn't a list so the syntax isn't the same.

Answer 1

You can't really match by doing an equality-comparison on two arrays like you had:
where f.columns=newcolumns and f.filters=newfilters
Instead, use Cosmos DB's built-in ARRAY_CONTAINS(), combined with ARRAY_LENGTH().
Since columns is a scalar array, it would look something like:
WHERE ARRAY_CONTAINS(c.columns, "banana")
AND ARRAY_CONTAINS(c.columns, "apple")
For filters, that isn't an array, so... first check to make sure the key is defined, then check if the value is correct:
WHERE IS_DEFINED(c.filters.truck) AND c.filters.truck="blue"
AND IS_DEFINED(c.filters.car) AND c.filters.car="red"
note: probably a good idea to turn your filters into subdocuments, since your current schema is an anti-pattern (using values as keys). Something like:
{
"filters": [
{ "vehicleType": "truck", "color": "blue" },
{ "vehicleType": "car", "color": "red" }
}
at that point you can compare with ARRAY_CONTAINS() again. Something like:
WHERE ARRAY_CONTAINS(c.filters, { "vehicleType": "truck", "color": "blue"}, true)