From 156e6e4c372f3b4c24d5c07c02603a29d0d95412 Mon Sep 17 00:00:00 2001
From: Frederick Muriuki Muriithi
Date: Fri, 2 Dec 2022 07:26:13 +0300
Subject: correlations: return `None` rather than zero for missing lit corrs

* gn3/computations/correlations.py: Return `None` for missing literature
  correlations rather than zero. Update the sorting key to avoid issues with
  comparing floats to NoneType objects
---
 gn3/computations/correlations.py | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gn3/computations/correlations.py b/gn3/computations/correlations.py
index 5a9ce62..8e8bea5 100644
--- a/gn3/computations/correlations.py
+++ b/gn3/computations/correlations.py
@@ -269,9 +269,9 @@ def fetch_lit_correlation_data(
                                            *tuple(reversed(query_values))))
             lit_corr_results = cursor.fetchone()
         lit_results = (gene_id, lit_corr_results[0])\
-            if lit_corr_results else (gene_id, 0)
+            if lit_corr_results else (gene_id, None)
         return lit_results
-    return (gene_id, 0)
+    return (gene_id, None)
 
 
 def lit_correlation_for_trait(
@@ -339,14 +339,19 @@ def compute_all_lit_correlation(conn, trait_lists: List,
     """Function that acts as an abstraction for
     lit_correlation_for_trait"""
 
+    def __sorter__(trait_name):
+        val = list(trait_name.values())[0]["lit_corr"]
+        try:
+            return (0, -abs(val))
+        except TypeError:
+            return (1, val)
+
     lit_results = lit_correlation_for_trait(
         conn=conn,
         target_trait_lists=trait_lists,
         species=species,
         trait_gene_id=gene_id)
-    sorted_lit_results = sorted(
-        lit_results,
-        key=lambda trait_name: -abs(list(trait_name.values())[0]["lit_corr"]))
+    sorted_lit_results = sorted(lit_results, key=__sorter__)
 
     return sorted_lit_results
 
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