Only show a single genotype dataset.HEADmain

It is expected that there is only ever a single genotype dataset for
any one particular population.

2 files changed, 12 insertions, 6 deletions

diff --git a/uploader/genotypes/models.py b/uploader/genotypes/models.py
index 642caa6..29acd0b 100644
--- a/uploader/genotypes/models.py
+++ b/uploader/genotypes/models.py
@@ -41,12 +41,15 @@ def genotype_markers(
         return tuple(dict(row) for row in cursor.fetchall())
 
 
-def genotype_datasets(
+def genotype_dataset(
         conn: mdb.Connection,
         species_id: int,
         population_id: int
-) -> tuple[dict, ...]:
-    """Retrieve genotype datasets from the database."""
+) -> Optional[dict]:
+    """Retrieve genotype datasets from the database.
+
+    Apparently, you should only ever have one genotype dataset for a population.
+    """
     with conn.cursor(cursorclass=DictCursor) as cursor:
         cursor.execute(
             "SELECT gf.* FROM Species AS s INNER JOIN InbredSet AS iset "
@@ -54,4 +57,7 @@ def genotype_datasets(
             "ON iset.Id=gf.InbredSetId "
             "WHERE s.Id=%s AND iset.Id=%s",
             (species_id, population_id))
-        return tuple(dict(row) for row in cursor.fetchall())
+        result = cursor.fetchone()
+        if bool(result):
+            return dict(result)
+        return None
diff --git a/uploader/genotypes/views.py b/uploader/genotypes/views.py
index 294da0e..8752b02 100644
--- a/uploader/genotypes/views.py
+++ b/uploader/genotypes/views.py
@@ -15,7 +15,7 @@ from uploader.population.models import (populations_by_species,
                                         population_by_species_and_id)
 
 from .models import (genotype_markers,
-                     genotype_datasets,
+                     genotype_dataset,
                      genotype_markers_count,
                      genocode_by_population)
 
@@ -98,7 +98,7 @@ def list_genotypes(species_id: int, population_id: int):
                                    conn, population_id),
                                total_markers=genotype_markers_count(
                                    conn, species_id),
-                               datasets=genotype_datasets(
+                               dataset=genotype_dataset(
                                    conn, species_id, population_id),
                                activelink="list-genotypes")