added api endpoint to delete a process instance w/ burnettk

src/spiffworkflow_backend/api.yml

@@ -325,6 +325,39 @@ paths:
                 items:
                   $ref: "#/components/schemas/Workflow"
 
+  /process-models/{process_group_id}/{process_model_id}/process-instances/{process_instance_id}:
+    parameters:
+      - name: process_group_id
+        in: path
+        required: true
+        description: The unique id of an existing process group
+        schema:
+          type: string
+      - name: process_model_id
+        in: path
+        required: true
+        description: The unique id of an existing workflow specification.
+        schema:
+          type: string
+      - name: process_instance_id
+        in: path
+        required: true
+        description: The unique id of an existing process instance.
+        schema:
+          type: integer
+    delete:
+      operationId: spiffworkflow_backend.routes.process_api_blueprint.process_instance_delete
+      summary: Deletes a single process group
+      tags:
+        - Process Groups
+      responses:
+        "200":
+          description: The process instance was deleted.
+          content:
+            application/json:
+              schema:
+                $ref: "#components/schemas/OkTrue"
+
   /process-models/{process_group_id}/{process_model_id}/process-instances/report:
     parameters:
       - name: process_group_id

src/spiffworkflow_backend/routes/process_api_blueprint.py

@@ -6,6 +6,7 @@ from flask import Blueprint
 from flask import g
 from flask import Response
 from flask_bpmn.api.api_error import ApiError
+from flask_bpmn.models.db import db
 
 from spiffworkflow_backend.models.file import FileSchema
 from spiffworkflow_backend.models.file import FileType
@@ -251,7 +252,7 @@ def process_instance_list(process_group_id, process_model_id, page=1, per_page=1
     if process_model is None:
         raise (
             ApiError(
-                code="process_mode_cannot_be_found",
+                code="process_model_cannot_be_found",
                 message=f"Process model cannot be found: {process_model_id}",
                 status_code=400,
             )
@@ -282,6 +283,23 @@ def process_instance_list(process_group_id, process_model_id, page=1, per_page=1
     return Response(json.dumps(response_json), status=200, mimetype="application/json")
 
 
+def process_instance_delete(process_group_id, process_model_id, process_instance_id):
+    """Create_process_instance."""
+    process_instance = ProcessInstanceModel.query.filter_by(id=process_instance_id).first()
+    if process_instance is None:
+        raise (
+            ApiError(
+                code="process_instance_cannot_be_found",
+                message=f"Process instance cannot be found: {process_instance_id}",
+                status_code=400,
+            )
+        )
+
+    db.session.delete(process_instance)
+    db.session.commit()
+    return Response(json.dumps({"ok": True}), status=200, mimetype="application/json")
+
+
 def process_instance_report(process_group_id, process_model_id, page=1, per_page=100):
     """Process_instance_list."""
     process_model = ProcessModelService().get_process_model(