How to use “IN” statement in FilterExpression using array - dynamodb

Question

Checked AWS document but did not find any working example.

Here is my attempt

var params = {
            TableName: \"User\",
            IndexName:\         


        

Answer 1

The Python3 version:

def get_filter_for_in_clause(column_name, in_values, column_type="S"):
    expressions = []
    for i in range(len(in_values)):
        expressions.append(f':temp{i}')
    filter_expression = f'{column_name} IN ({", ".join(expressions)})'

    expression_attribute_values = {}
    for index, expression in enumerate(expressions):
        expression_attribute_values[expression] = {column_type: in_values[index]}

    return filter_expression, expression_attribute_values

Usage:

column = 'testcolumn'
inputs = ['testvalue1', 'testvalue2', 'testvalue3']
filter_expression, expression_attribute_values = get_filter_for_in_clause(column, inputs)

Result:

# filter_expression = 'testcolumn IN (:temp0, :temp1, :temp2)'
# expression_attribute_values = {':temp0': {'S': 'testvalue1'}, ':temp1': {'S': 'testvalue2'}, ':temp2': {'S': 'testvalue3'}}