Add score computer function.

No-Issue

Signed-off-by: James Tanner <tanner.jc@gmail.com>

galaxy_ng/app/utils/survey.py

@@ -0,0 +1,24 @@
+SURVEY_FIELDS = [
+    'docs',
+    'ease_of_use',
+    'does_what_it_says',
+    'works_as_is',
+    'used_in_production'
+]
+
+
+def calculate_survey_score(surveys):
+
+    answer_count = 0
+    survey_score = 0.0
+
+    for survey in surveys:
+        for k in SURVEY_FIELDS:
+            data = getattr(survey, k)
+            if data is not None:
+                answer_count += 1
+                survey_score += (data - 1) / 4
+
+    score = (survey_score / answer_count) * 5
+
+    return score