Strategy should use better param description

Adds support for more fields sucha as description, required, etc.

relates to #182

docs/developer-guide.md

@@ -59,11 +59,14 @@ npm test
 We use database migrations to track database changes. 
 
 ### Making a schema change
+In order to run migrations you will set the environment variable for DATABASE_URL
+
+`export DATABASE_URL=postgres://unleash_user:passord@localhost:5432/unleash`
 
 Use db-migrate to create new migrations file. 
 
 ```bash
-> ./node_modules/.bin/db-migrate create your-migration-name
+> npm run db-migrate -- create YOUR-MIGRATION-NAME
 ```
 
 All migrations requires on `up` and one `down` method. 
@@ -86,6 +89,12 @@ exports.down = function (db, cb) {
 };
 ``` 
 
+Test your migrations:
+
+```bash
+> npm run db-migrate -- up
+> npm run db-migrate -- down
+```
 
 
 ## Publishing / Releasing new packages

migrations/20161212101749-better-strategy-parameter-definitions.js

@@ -0,0 +1,61 @@
+/* eslint camelcase: "off" */
+'use strict';
+
+const async = require('async');
+
+exports.up = function (db, callback) {
+    const populateNewData = (cb) => {
+        db.all('select name, parameters_template from strategies', (err, results) => {
+            const updateSQL = results
+              .map(({ name, parameters_template }) => {
+                  const parameters = [];
+                  Object.keys(parameters_template || {}).forEach(p => {
+                      parameters.push({ name: p, type: parameters_template[p], description: '' });
+                  });
+                  return { name, parameters };
+              })
+              .map(strategy => `
+                UPDATE strategies 
+                SET parameters='${JSON.stringify(strategy.parameters)}'
+                WHERE name='${strategy.name}';`)
+              .join('\n');
+
+            db.runSql(updateSQL, cb);
+        });
+    };
+
+    async.series([
+        db.addColumn.bind(db, 'strategies', 'parameters', { type: 'json' }),
+        populateNewData.bind(db),
+        db.removeColumn.bind(db, 'strategies', 'parameters_template'),
+    ], callback);
+};
+
+exports.down = function (db, callback) {
+    const populateOldData = (cb) => {
+        db.all('select name, parameters from strategies', (err, results) => {
+            const updateSQL = results
+              .map(({ name, parameters }) => {
+                  const parameters_template = {};
+                  parameters.forEach(p => {
+                      parameters_template[p.name] = p.type;
+                  });
+
+                  return { name, parameters_template };
+              })
+              .map(strategy => `
+                UPDATE strategies 
+                SET parameters_template='${JSON.stringify(strategy.parameters_template)}'
+                WHERE name='${strategy.name}';`)
+              .join('\n');
+
+            db.runSql(updateSQL, cb);
+        });
+    };
+
+    async.series([
+        db.addColumn.bind(db, 'strategies', 'parameters_template', { type: 'json' }),
+        populateOldData.bind(db),
+        db.removeColumn.bind(db, 'strategies', 'parameters'),
+    ], callback);
+};

package.json

@@ -37,8 +37,7 @@
     "start:dev": "NODE_ENV=development supervisor --ignore ./node_modules/ server.js",
     "start:dev:pg": "pg_virtualenv npm run start:dev:pg-chain",
     "start:dev:pg-chain": "export DATABASE_URL=postgres://$PGUSER:$PGPASSWORD@localhost:$PGPORT/postgres ; db-migrate up && npm run start:dev",
-    "db-migrate": "db-migrate up",
-    "db-migrate:down": "db-migrate down",
+    "db-migrate": "db-migrate",
     "lint": "eslint lib",
     "pretest": "npm run lint",
     "test": "PORT=4243 ava test lib/*.test.js lib/**/*.test.js",