Minimum working iterator version

Checkpointing. This is a minimum working version using the iterator. I basically hacked consuming the iterator since I want to switch directions, but this is a good place to come back to.

backend/app/rest_api/rest.py

@@ -1,10 +1,10 @@
 from flask import (
-    Blueprint, render_template, request, url_for
+    Blueprint, request
 )
 from flask_restful_swagger_2 import Api, swagger, Resource
-from ..util.utils import make_payload
-from ..util.filter import parse_filter, QueryStringError
 
+from ..util.utils import make_payload
+from ..util.filter import parse_filter
 
 
 class InitializeAPI(Resource):
@@ -88,15 +88,17 @@ class InitializeAPI(Resource):
         }
     })
     def get(self):
-        from cxg import data, REACTIVE_LIMIT
+        from app import data, REACTIVE_LIMIT
         return make_payload({
             "schema": data.schema,
-            "ranges": data.metadata_ranges(data.ADATA, data.schema),
-            "cellcount": data.cell_count(),
+            "cellcount": data.cell_count,
             "reactivelimit": REACTIVE_LIMIT,
-            "genes": data.all_genes(),
+            "genes": data.genes(),
+            "ranges": data.metadata_ranges(),
+
         })
 
+
 class CellsAPI(Resource):
     @swagger.doc({
         'summary': 'filter based on metadata fields to get a subset cells, expression data, and metadata',
@@ -189,7 +191,7 @@ class CellsAPI(Resource):
         }
     })
     def get(self):
-        from cxg import data
+        from app import data
         payload = {
             "cellids": [],
             "metadata": [],
@@ -199,14 +201,16 @@ class CellsAPI(Resource):
         }
         # get query params
         filter = parse_filter(request.args, data.schema)
-        filtered_data = data.filter_cells(filter)
-        payload["metadata"], payload["cellids"] = data.metadata(filtered_data)
-        payload["ranges"] = data.metadata_ranges(filtered_data, data.schema)
+        filtered_data = list(data.filter_cells(filter))
+        payload["metadata"] = list(data.metadata(filtered_data))
+        payload["ranges"] = list(data.metadata_ranges(filtered_data))
+        payload["cellids"] = filtered_data
         payload["cellcount"] = len(payload["cellids"])
-        payload["graph"] = data.create_graph(filtered_data)
+        payload["graph"] = list(data.create_graph(filtered_data))
         return make_payload(payload)
 
 
+
 def get_api_resources():
     bp = Blueprint('api', __name__, url_prefix='/api/v2.0')
     api = Api(bp, add_api_spec_resource=False)