Sort search results to match query better (#97)

Author: katesliang

src/app/coursegrab/dao/courses_dao.py

@@ -19,8 +19,15 @@ def create_course(subject_code, course_num, title):
 
 
 def search_courses(query):
-    return Course.query.filter(Course.search_string.ilike("%{}%".format(query))).limit(NUM_SEARCH_RESULT)
-
+    results = Course.query.filter(Course.search_string.ilike("%{}%".format(query))).limit(NUM_SEARCH_RESULT)
+    results = sorted(results, key = lambda r : find_query_index(r, query))
+    return results
+
+def find_query_index(course, key):
+    try: 
+        return course.search_string.lower().index(key) 
+    except(Error): 
+        return -1
 
 def clear_table():
     Course.query.delete()