1 files changed, 25 insertions, 0 deletions

diff --git a/app/assets/javascripts/issues/list/graphql.js b/app/assets/javascripts/issues/list/graphql.js
new file mode 100644
index 00000000000..5ef61727a3d
--- /dev/null
+++ b/app/assets/javascripts/issues/list/graphql.js
@@ -0,0 +1,25 @@
+import produce from 'immer';
+import createDefaultClient from '~/lib/graphql';
+import getIssuesQuery from 'ee_else_ce/issues/list/queries/get_issues.query.graphql';
+
+const resolvers = {
+  Mutation: {
+    reorderIssues: (_, { oldIndex, newIndex, namespace, serializedVariables }, { cache }) => {
+      const variables = JSON.parse(serializedVariables);
+      const sourceData = cache.readQuery({ query: getIssuesQuery, variables });
+
+      const data = produce(sourceData, (draftData) => {
+        const issues = draftData[namespace].issues.nodes.slice();
+        const issueToMove = issues[oldIndex];
+        issues.splice(oldIndex, 1);
+        issues.splice(newIndex, 0, issueToMove);
+
+        draftData[namespace].issues.nodes = issues;
+      });
+
+      cache.writeQuery({ query: getIssuesQuery, variables, data });
+    },
+  },
+};
+
+export const gqlClient = createDefaultClient(resolvers);