From 8433f1d7a8422b38d96b429a7eb258bfcb80607d Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 18 Mar 2017 09:02:32 +0530
Subject: [PATCH] Generator erroneously used as list

---
 src/calibre/ebooks/metadata/sources/amazon.py | 4 ++--
 src/calibre/ebooks/metadata/sources/douban.py | 4 ++--
 src/calibre/ebooks/metadata/sources/google.py | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/calibre/ebooks/metadata/sources/amazon.py b/src/calibre/ebooks/metadata/sources/amazon.py
index f52cbb8d7a..f3e9e2cb4e 100644
--- a/src/calibre/ebooks/metadata/sources/amazon.py
+++ b/src/calibre/ebooks/metadata/sources/amazon.py
@@ -1072,8 +1072,8 @@ class Amazon(Source):
                     q['field-title'] = ' '.join(title_tokens)
                     terms.extend(title_tokens)
             if authors:
-                author_tokens = self.get_author_tokens(authors,
-                                                       only_first_author=True)
+                author_tokens = list(self.get_author_tokens(authors,
+                                                       only_first_author=True))
                 if author_tokens:
                     q['field-author'] = ' '.join(author_tokens)
                     terms.extend(author_tokens)
diff --git a/src/calibre/ebooks/metadata/sources/douban.py b/src/calibre/ebooks/metadata/sources/douban.py
index fa823678e2..ff23c172df 100644
--- a/src/calibre/ebooks/metadata/sources/douban.py
+++ b/src/calibre/ebooks/metadata/sources/douban.py
@@ -196,8 +196,8 @@ class Douban(Source):
             title_tokens = list(self.get_title_tokens(title))
             if title_tokens:
                 q += build_term('title', title_tokens)
-            author_tokens = self.get_author_tokens(authors,
-                    only_first_author=True)
+            author_tokens = list(self.get_author_tokens(authors,
+                    only_first_author=True))
             if author_tokens:
                 q += ((' ' if q != '' else '') +
                     build_term('author', author_tokens))
diff --git a/src/calibre/ebooks/metadata/sources/google.py b/src/calibre/ebooks/metadata/sources/google.py
index b64f9d095f..acc85e177e 100644
--- a/src/calibre/ebooks/metadata/sources/google.py
+++ b/src/calibre/ebooks/metadata/sources/google.py
@@ -210,7 +210,7 @@ class GoogleBooks(Source):
             title_tokens = list(self.get_title_tokens(title))
             if title_tokens:
                 q += build_term('title', title_tokens)
-            author_tokens = self.get_author_tokens(authors, only_first_author=True)
+            author_tokens = list(self.get_author_tokens(authors, only_first_author=True))
             if author_tokens:
                 q += ('+' if q else '') + build_term('author', author_tokens)