add namespacing to blank nodes on import

Author: Benjamin Forster

lib/utils.js

@@ -17,6 +17,15 @@ function collect (stream, cb) {
   stream.once('end', cb.bind(null, null, res))
 }
 
+function namespaceBlankVariables (triple) {
+  Object.keys(triple).forEach((key) => {
+    if (triple[key].startsWith && triple[key].startsWith('_:')) {
+      triple[key] = triple[key].replace(/^_:/, 'hypergraph:')
+    }
+  })
+  return triple
+}
+
 function filterTriple (triple) {
   const filtered = {}
   defs.spo.forEach((key) => {
@@ -58,7 +67,7 @@ function genKeys (triple) {
 function generateBatch (triple, action) {
   if (!action) action = 'put'
   var data = (action === 'put')
-    ? JSON.stringify(triple)
+    ? JSON.stringify(namespaceBlankVariables(triple))
     : null
   return genKeys(triple).map(key => ({
     type: 'put', // no delete in hyperdb so just puting nulls