chore: add totalEdges for Postgres snippet (#91)

* chore: add totalEdges for Postgres snippet

* Update api.graphql

* test: add totalEdges response values

Author: ddebrunner

dbquery/pagination/api.graphql

@@ -26,6 +26,11 @@ the starting point).
 type CustomerConnection {
   edges: [CustomerEdge]
   pageInfo: PageInfo!
+
+  """
+  Total number of edges, will be `null` if the value cannot be determined.
+  """
+  totalEdges: Int
 }
 
 """

dbquery/pagination/operations.graphql

@@ -11,5 +11,6 @@ query Customers($first: Int!, $after: String = "") {
       endCursor
       hasNextPage
     }
+    totalEdges
   }
 }

dbquery/pagination/tests/Test.js

@@ -41,7 +41,8 @@ describe(testDescription, function () {
           pageInfo: {
             hasNextPage: true,
             endCursor: CURSOR
-          }
+          },
+          totalEdges: 10
         }
       },
     },
@@ -72,7 +73,8 @@ describe(testDescription, function () {
           pageInfo: {
             endCursor: "eyJjIjoiTDpRdWVyeTpjdXN0b21lcnMiLCJvIjozfQ==",
             hasNextPage: true
-          }
+          },
+          totalEdges: 10
         }
       },
     },