From 638fe54c2a947347c304b39421c8ea8e0503f274 Mon Sep 17 00:00:00 2001
From: Alex Yatskov <alex@foosoft.net>
Date: Mon, 7 Nov 2016 22:12:18 -0800
Subject: Prevent duplicate import

---
 ext/bg/js/database.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index 79a0a7a1..50a6ecd7 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -161,19 +161,21 @@ class Database {
         }
 
         const indexLoaded = (title, version, entities, hasTerms, hasKanji) => {
-            return this.db.dictionaries.add({title, version, hasTerms, hasKanji}).then(() => {
-                this.entities = entities || {};
-
-                const rows = [];
-                for (const name in entities || {}) {
-                    rows.push({
-                        name,
-                        value: entities[name],
-                        dictionary: title
-                    });
+            return this.db.dictionaries.where('title').equals(title).count().then(count => {
+                if (count > 0) {
+                    return Promise.reject(`dictionary "${title}" is already imported`);
                 }
 
-                return this.db.entities.bulkAdd(rows);
+                return this.db.dictionaries.add({title, version, hasTerms, hasKanji}).then(() => {
+                    this.entities = entities || {};
+
+                    const rows = [];
+                    for (const name in entities || {}) {
+                        rows.push({name, value: entities[name], dictionary: title});
+                    }
+
+                    return this.db.entities.bulkAdd(rows);
+                });
             });
         };
 
-- 
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