fix: dont break pagination if there are no edges

Author: mickhansen

src/relay.js

@@ -188,6 +188,7 @@ export function sequelizeConnection({name, nodeType, target, orderBy: orderByEnu
       }
 
       options.where = argsToWhere(args);
+      options.required = false;
 
       if (args.after || args.before) {
         let cursor = fromCursor(args.after || args.before);
@@ -237,6 +238,9 @@ export function sequelizeConnection({name, nodeType, target, orderBy: orderByEnu
       let lastEdge = edges[edges.length - 1];
       let fullCount = values[0] && values[0].dataValues.full_count && parseInt(values[0].dataValues.full_count, 10);
 
+      if (!values[0]) {
+        fullCount = 0;
+      }
       if (model.sequelize.dialect.name === 'postgres' && (args.first || args.last)) {
         if (fullCount === null || fullCount === undefined) throw new Error('No fullcount available');
       }

test/integration/relay/connection.test.js

@@ -597,6 +597,35 @@ if (helper.sequelize.dialect.name === 'postgres') {
         expect(result.data.user.tasks.totalCount).to.equal(4);
         expect(this.userTaskConnectionFieldSpy.firstCall.args[0].source.get('tasks')).to.be.undefined;
       });
+
+      it('should not barf on paging if there are no connection edges', async function () {
+        let user = await this.User.create({});
+
+        let result = await graphql(this.schema, `
+          {
+            user(id: ${user.get('id')}) {
+              tasks(first: 10) {
+                totalCount
+
+                edges {
+                  node {
+                    id
+                  }
+                }
+
+                pageInfo {
+                  hasNextPage
+                }
+              }
+            }
+          }
+        `, {});
+
+        if (result.errors) throw new Error(result.errors[0].stack);
+        expect(result.data.user).not.to.be.null;
+        expect(result.data.user.tasks.totalCount).to.equal(0);
+        expect(result.data.user.tasks.pageInfo.hasNextPage).to.equal(false);
+      });
     });
   });
 }