How to retrieve items from a DynamoDB table where the fields array is not empty using JavaScript FilterExpression

Can anyone help me with filtering this sample dynamodb table to only return items where either the "old" or "new" array is not empty? In the example below, it should retrieve the items with id "2" and "3".

Table: field name = item

[
  {
    id: "1",
    product: {"new": [], "old": []},
  },
  {
    id: "2",
    product: {"new": [{name: "a"}], "old": [name: "a"]},
  },
  {
    id: "3",
    product: {"new": [], "old": [name: "a"]},
  },
]

I would like the filter expression to look something like this:

FilterExpression: 'isTest = :boolean',
ExpressionAttributeValues: { ':boolean': isTest },  

Answer №1

If each item in your list corresponds to a unique entry in your table, you can accomplish your objective by utilizing a Scan operation along with the provided FilterExpression:

aws dynamodb scan \
--table-name <yourtablename> \
--filter-expression 'size(#v.#o) > :num OR size(#v.#n) > :num' \
--expression-attribute-names '{"#v": "product", "#o": "old", "#n":"new"}' \
--expression-attribute-values '{":num":{"N":"0"}}'

By leveraging the size filter function:

In case the attribute is of type List or Map, the size function provides the count of child elements. For instance, determining if the quantity of OneStar reviews surpasses a specified threshold. Substitute :v_sub in the expression attribute value with 3.

size(ProductReviews.OneStar) > :v_sub

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