Handle duplicate dataset creation error

Notify the user when they try to create a new dataset that has the
same name as an existing dataset and give them the chance to fix it
before continuing.

1 files changed, 11 insertions, 5 deletions

diff --git a/qc_app/dbinsert.py b/qc_app/dbinsert.py
index 4711262..ab1c350 100644
--- a/qc_app/dbinsert.py
+++ b/qc_app/dbinsert.py
@@ -255,10 +255,8 @@ def select_dataset():
         studyid = form["studyid"]
         datasets = datasets_by_study(studyid)
         return render_template(
-            "select_dataset.html", filename=form["filename"],
-            filetype=form["filetype"], totallines=form["totallines"],
-            species=form["species"], genechipid=form["genechipid"],
-            studyid=studyid, datasets=datasets, avgmethods=averaging_methods(),
+            "select_dataset.html", **{**form, "studyid": studyid},
+            datasets=datasets, avgmethods=averaging_methods(),
             datascales=dataset_datascales())
     except AssertionError as aserr:
         return render_error(f"Missing data: {aserr.args[0]}")
@@ -283,11 +281,19 @@ def create_dataset():
 
         with database_connection() as conn:
             with conn.cursor(cursorclass=DictCursor) as cursor:
+                datasetname = form["datasetname"]
+                cursor.execute("SELECT * FROM ProbeSetFreeze WHERE Name=%s",
+                               (datasetname,))
+                results = cursor.fetchall()
+                if bool(results):
+                    flash("A dataset with that name already exists.",
+                          "alert-error")
+                    return redirect(url_for("dbinsert.select_dataset"), code=307)
                 cursor.execute("SELECT MAX(Id) AS last_id FROM ProbeSetFreeze")
                 new_datasetid = cursor.fetchone()["last_id"] + 1
                 values = (
                     new_datasetid, form["studyid"], form["avgid"],
-                    form.get("datasetname",""), form["datasetname2"],
+                    datasetname, form["datasetname2"],
                     form["datasetfullname"], form["datasetshortname"],
                     datetime.now().date().strftime("%Y-%m-%d"),
                     form["datasetpublic"], form["datasetconfidentiality"],