Basic bookshop w/o reuse deps (#312)

bookshop/db/init.js

@@ -0,0 +1,24 @@
+/**
+ * In order to keep basic bookshop sample as simple as possible, we don't add
+ * reuse dependencies. This db/init.js ensures we still have a minimum set of
+ * currencies, if not obtained through @capire/common.
+ */
+
+module.exports = async (db)=>{
+
+  const has_common = db.model.definitions['sap.common.Currencies'].elements.numcode
+  if (has_common) return
+
+  const already_filled = await db.exists('sap.common.Currencies',{code:'EUR'})
+  if (already_filled) return
+
+  await INSERT.into ('sap.common.Currencies') .columns (
+    'code','symbol','name'
+  ) .rows (
+    [ 'EUR','€','Euro' ],
+    [ 'USD','$','US Dollar' ],
+    [ 'GBP','£','British Pound' ],
+    [ 'ILS','₪','Shekel' ],
+    [ 'JPY','¥','Yen' ],
+  )
+}