Deployable hello function behind api gateway

services/db.js

@@ -0,0 +1,61 @@
+const dynamoClient = require('../dynamoClient');
+
+const create = async (tableName, item) => {
+  const fullItem = {...item, created_at: Date.now()};
+
+  await dynamoClient.put({
+    TableName: tableName,
+    Item: fullItem
+  }).promise();
+
+  // put does not return saved item, just return our object
+  return fullItem;
+};
+
+const get = async (tableName, keyMap) => {
+  const res = await dynamoClient.get({
+    TableName: tableName,
+    Key: keyMap
+  }).promise();
+
+  return res && res.Item;
+};
+
+const queryByID = async (tableName, idKeyName, id) => {
+  // querying by id can be used when we are querying a table
+  // that has a sortKey, but we don't need to use the sortKey
+  const res = await dynamoClient.query({
+    TableName: "gt_answers",
+    KeyConditionExpression: "#id = :idValue",
+    ExpressionAttributeNames: {
+      "#id": idKeyName,
+    },
+    ExpressionAttributeValues: {
+      ":idValue": id,
+    }
+  }).promise();
+
+  return res && res.Items;
+};
+
+const update = async (tableName, keyMap, ue, eav) => {
+  const res = await dynamoClient.update({
+    TableName: tableName,
+    Key: keyMap,
+    UpdateExpression: ue,
+    ExpressionAttributeValues: eav,
+    ReturnValues: 'UPDATED_NEW'
+  }).promise();
+
+  console.log('update res', res);
+
+  return res;
+};
+
+module.exports = {
+  client: dynamoClient,
+  create,
+  get,
+  queryByID,
+  update
+};