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October 23, 2018 15:28
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dynamodb helpers
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const AWS = require('aws-sdk') | |
AWS.config.update({ region: 'us-east-1' }) | |
const { DynamoDB } = AWS | |
const dynamoDB = new DynamoDB.DocumentClient() | |
module.exports.query = function (attributeName, attributeValue, tableName) { | |
const params = { | |
ExpressionAttributeNames: { | |
[`#${attributeName}`]: attributeName | |
}, | |
ExpressionAttributeValues: { | |
[`:${attributeName}`]: attributeValue | |
}, | |
// FilterExpression: `#${attributeName} = :${attributeName}`, | |
KeyConditionExpression: `#${attributeName} = :${attributeName}`, | |
TableName: tableName | |
} | |
return dynamoDB.query(params).promise() | |
} | |
module.exports.getItem = function (attributeName, attributeValue, tableName) { | |
const params = { | |
TableName: tableName, | |
Key: { [attributeName]: attributeValue } | |
} | |
return dynamoDB.get(params).promise() | |
} | |
module.exports.putItem = function (item, tableName) { | |
console.log('table', process.env.DYNAMODB_TABLE) | |
const params = { | |
TableName: tableName, | |
Item: item | |
} | |
return dynamoDB.put(params).promise() | |
} | |
module.exports.updateItem = function (keyAttribute, keyValue, attrsToUpdate, attrValues, tableName) { | |
const expressionAttributeNames = attrsToUpdate.map((attrToUpdate) => { | |
return { [`#${attrToUpdate}`]: attrToUpdate } | |
}).reduce((accum, item) => ({ ...accum, ...item }), {}) | |
const expressionAttributeValues = attrsToUpdate.map((attrToUpdate, index) => { | |
return { [`:${attrToUpdate}`]: attrValues[index] } | |
}).reduce((accum, item) => ({ ...accum, ...item }), {}) | |
console.log('attrNames', expressionAttributeNames) | |
console.log('attrValues', expressionAttributeValues) | |
const updateExpression = attrsToUpdate.map((attrToUpdate) => `#${attrToUpdate} = :${attrToUpdate}`).join(', ') | |
const params = { | |
TableName: tableName, | |
Key: { | |
[keyAttribute]: keyValue | |
}, | |
UpdateExpression: 'set ' + updateExpression, | |
ExpressionAttributeNames: expressionAttributeNames, | |
ExpressionAttributeValues: expressionAttributeValues | |
} | |
return dynamoDB.update(params).promise() | |
} | |
module.exports.deleteItem = function (attributeName, attributeValue, tableName) { | |
const params = { | |
TableName: tableName, | |
Key: { | |
[attributeName]: attributeValue | |
} | |
} | |
return dynamoDB.delete(params).promise() | |
} | |
module.exports.scan = function (keys, values, tableName, filterExpression) { | |
const expressionAttributeNames = keys.map((attrToUpdate) => { | |
return { [`#${attrToUpdate}`]: attrToUpdate } | |
}).reduce((accum, item) => ({ ...accum, ...item }), {}) | |
const expressionAttributeValues = keys.map((attrToUpdate, index) => { | |
return { [`:${attrToUpdate}`]: values[index] } | |
}).reduce((accum, item) => ({ ...accum, ...item }), {}) | |
console.log('attrNames', expressionAttributeNames) | |
console.log('attrValues', expressionAttributeValues) | |
let _filterExpression = keys.map((attrToUpdate) => `#${attrToUpdate} = :${attrToUpdate}`).join(' AND ') | |
_filterExpression = filterExpression ? `${_filterExpression} AND ${filterExpression}` : _filterExpression | |
const params = { | |
ExpressionAttributeNames: expressionAttributeNames, | |
ExpressionAttributeValues: expressionAttributeValues, | |
TableName: tableName, | |
FilterExpression: _filterExpression | |
} | |
return dynamoDB.scan(params).promise() | |
} | |
module.exports.appendToList = function (attributeName, attributeValue, keyToUpdate, jsonVals = [], tableName) { | |
const params = { | |
TableName: tableName, | |
Key: { | |
[attributeName]: attributeValue | |
}, | |
UpdateExpression: 'SET #c = list_append(#c, :vals)', | |
ExpressionAttributeNames: { | |
'#c': keyToUpdate | |
}, | |
ExpressionAttributeValues: { | |
':vals': jsonVals | |
}, | |
ReturnValues: 'UPDATED_NEW' | |
} | |
return dynamoDB.update(params).promise() | |
} | |
module.exports.updateItemInList = function (attributeName, attributeValue, keyToUpdate, listItemIndex, value, tableName) { | |
const params = { | |
TableName: tableName, | |
Key: { | |
[attributeName]: attributeValue | |
}, | |
UpdateExpression: `SET #item[${listItemIndex}] = :value`, | |
ExpressionAttributeNames: { | |
'#item': keyToUpdate | |
}, | |
ExpressionAttributeValues: { | |
':value': value | |
}, | |
ReturnValues: 'UPDATED_NEW' | |
} | |
return dynamoDB.update(params).promise() | |
} | |
module.exports.deleteItemFromList = function (attributeName, attributeValue, keyToUpdate, listItemIndex, tableName) { | |
console.log('EXPRESSION', `REMOVE #item[${listItemIndex}]`) | |
const params = { | |
TableName: tableName, | |
ExpressionAttributeNames: { | |
'#item': keyToUpdate | |
}, | |
Key: { | |
[attributeName]: attributeValue | |
}, | |
UpdateExpression: `REMOVE #item[${listItemIndex}]`, | |
ReturnValues: 'ALL_NEW' | |
} | |
return dynamoDB.update(params).promise() | |
} |
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