DynamoHelper

This is a tiny module that eases calls to DynamoDB. It includes only the most frequently-used calls I make, along with configuration I often use. Could be useful for someone else, but I'm hosting it here for easier installation and updates between projects. :)

const DynamoHelper = require('dynamo-helper');
DynamoHelper.scan(...);
DynamoHelper.add(...);
DynamoHelper.get(...);
DynamoHelper.delete(...);

Installation

npm install dynamo-helper

Functions

add

Calls update for an item. It crafts the UpdateStatement based on the keys and values of the object parameter.

Parameters:

• tableName (String)
• idProperty (String) - The name of the hash field.
• idValue (String) - The actual value of the id.
• object (Map) - The object to insert or update.

Returns:

Promise(item) - A promise which will resolve with the added item, or an error if one occurred.

scan

Scans a given table. Optionally accepts an index name and filters. Currently does not support paging.

Parameters:

• tableName (String)
• indexName (String, optional) - A secondary index to use.
• filters (Map, optional) - The filters to be added to FilterExpression and ExpressionAttributeValues.
• projection (String, optional) - A ProjectionExpression to filter result columns.

Returns:

Promise({
    items: [...],
    count: 
})

The items are an array of scanned rows (which may be filtered). The count represents the TotalCount.

get

Get by id.

Parameters:

• tableName (String)
• idProperty (String) - The name of the hash field.
• idValue (String) - The actual value of the id.

Returns:

Promise(item) - A promise which will resolve with the item or null (if none was found).

delete

Delete by id.

Parameters:

• tableName (String)
• idProperty (String) - The name of the hash field.
• idValue (String) - The actual value of the id.

Returns:

Promise(item) - A promise which will resolve with the deleted item.