Tweaked automatic seeding and readme.

Changed merge order for proper use of cli-commands e.g. --seed.

Author: nenti

README.md

@@ -127,6 +127,17 @@ dynamodb:
 > sls dynamodb start --seed=domain,test
 ```
 
+If seed config is set to true, your configuration will be seeded automatically on startup. You can also put the seed to false to prevent initial seeding to use manual seeding via cli.
+
+```fake-test-users.json example
+[
+  {
+    "id": "John",
+    "name": "Doe",
+  },
+]
+```
+
 ## Using DynamoDB Local in your code
 You need to add the following parameters to the AWS NODE SDK dynamodb constructor
 

index.js

@@ -148,8 +148,8 @@ class ServerlessDynamodbLocal {
         const options = _.merge({
                 sharedDb: this.options.sharedDb || true
             },
-            this.options,
-            config && config.start
+            config && config.start,
+            this.options
         );
 
         dynamodbLocal.start(options);
@@ -181,12 +181,16 @@ class ServerlessDynamodbLocal {
     get seedSources() {
         const config = this.service.custom.dynamodb;
         const seedConfig = _.get(config, "seed", {});
-        const seed = this.options.seed || Object.keys(seedConfig).join(',');
-        if (!seed) {
-            this.serverlessLog("DynamoDB - No seed categories defined. Skipping data seeding.");
+        const seed = this.options.seed;
+        let categories;
+        if (typeof seed === "string") {
+            categories = seed.split(",");
+        } else if(seed) {
+            categories = Object.keys(seedConfig);
+        } else { // if (!seed)
+            this.serverlessLog("DynamoDB - No seeding defined. Skipping data seeding.");
             return [];
         }
-        const categories = seed.split(",");
         const sourcesByCategory = categories.map((category) => seedConfig[category].sources);
         return [].concat.apply([], sourcesByCategory);
     }