Only show a single genotype dataset.

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

3 files changed, 22 insertions, 19 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")
 
diff --git a/uploader/templates/genotypes/list-genotypes.html b/uploader/templates/genotypes/list-genotypes.html
index 8afd591..3780f85 100644
--- a/uploader/templates/genotypes/list-genotypes.html
+++ b/uploader/templates/genotypes/list-genotypes.html
@@ -95,14 +95,8 @@
   <p>The genotype data is organised under various genotype datasets. You can
     click on the link for the relevant dataset to view a little more information
     about it.</p>
-  <p>You can also create a new genotype dataset by clicking the button below.
-    <br />
-    <a href="#create-new-genotype-dataset"
-       title="Create a new genotype dataset for the '{{population.FullName}}' population for the '{{species.FullName}}' species."
-       class="btn btn-primary">
-      create new genotype dataset</a></p>
 
-  {%if datasets | length > 0%}
+  {%if dataset is defined %}
     <table class="table">
       <thead>
         <tr>
@@ -112,7 +106,6 @@
       </thead>
 
       <tbody>
-        {%for dataset in datasets%}
         <tr>
           <td>{{dataset.Name}}</td>
           <td><a href="{{url_for('species.populations.genotypes.view_dataset',
@@ -122,14 +115,18 @@
                  title="View details regarding and manage dataset '{{dataset.FullName}}'">
               {{dataset.FullName}}</a></td>
         </tr>
-        {%endfor%}
       </tbody>
     </table>
   {%else%}
-    <p class="text-warning">
-      <span class="glyphicon glyphicon-exclamation-sign"></span>
-      There are no genotype datasets to display, yet!
-    </p>
+  <p class="text-warning">
+    <span class="glyphicon glyphicon-exclamation-sign"></span>
+    There is no genotype dataset defined for this population.
+  </p>
+  <p>
+    <a href="#create-new-genotype-dataset"
+       title="Create a new genotype dataset for the '{{population.FullName}}' population for the '{{species.FullName}}' species."
+       class="btn btn-primary">
+      create new genotype dataset</a></p>
   {%endif%}
 </div>
 {%endblock%}