Add endpoint for listing process models in a group

Add pagination for listing process groups

src/spiffworkflow_backend/api.yml

@@ -11,6 +11,19 @@ security:
 
 paths:
   /process-groups:
+    parameters:
+      - name: page
+        in: query
+        required: false
+        description: The page number to return. Defaults to page 1.
+        schema:
+          type: integer
+      - name: per_page
+        in: query
+        required: false
+        description: The number of groups to show per page. Defaults to page 10.
+        schema:
+          type: integer
     # process_groups_list
     get:
       operationId: spiffworkflow_backend.routes.process_api_blueprint.process_groups_list
@@ -92,6 +105,42 @@ paths:
               schema:
                 $ref: "#/components/schemas/WorkflowSpecCategory"
 
+  /process-groups/{process_group_id}/process-models:
+    parameters:
+      - name: process_group_id
+        in: path
+        required: true
+        description: The group containing the models we want to return
+        schema:
+          type: string
+      - name: page
+        in: query
+        required: false
+        description: The page number to return. Defaults to page 1.
+        schema:
+          type: integer
+      - name: per_page
+        in: query
+        required: false
+        description: The number of models to show per page. Defaults to page 10.
+        schema:
+          type: integer
+    # process_model_list
+    get:
+      operationId: spiffworkflow_backend.routes.process_api_blueprint.process_model_list
+      summary: Return a list of process models for a given process group
+      tags:
+        - Process Models
+      responses:
+        "200":
+          description: Successfully return the requested models
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/WorkflowSpec"
+
   /process-models:
     # process_model_add
     post:

src/spiffworkflow_backend/routes/process_api_blueprint.py

@@ -59,10 +59,11 @@ def process_group_update(process_group_id, body):
     return ProcessGroupSchema().dump(process_group)
 
 
-def process_groups_list():
+def process_groups_list(page=1, per_page=100):
     """Process_groups_list."""
     process_groups = ProcessModelService().get_process_groups()
-    return ProcessGroupSchema(many=True).dump(process_groups)
+    batch = ProcessModelService().get_batch(process_groups, page, per_page)
+    return ProcessGroupSchema(many=True).dump(batch)
 
 
 def process_group_show(process_group_id):

src/spiffworkflow_backend/services/process_model_service.py

@@ -26,6 +26,12 @@ class ProcessModelService(FileSystemService):
     GROUP_SCHEMA = ProcessGroupSchema()
     WF_SCHEMA = ProcessModelInfoSchema()
 
+    @staticmethod
+    def get_batch(items, page=1, per_page=10):
+        start =  (page - 1) * per_page
+        end = start + per_page
+        return items[start:end]
+
     def add_spec(self, spec: ProcessModelInfo):
         """Add_spec."""
         display_order = self.next_display_order(spec)