added back store check

Author: waleedlatif1

apps/sim/stores/workflows/workflow/store.test.ts

@@ -297,6 +297,19 @@ describe('workflow store', () => {
       expectEdgeConnects(edges, 'block-1', 'block-2')
     })
 
+    it('should not add duplicate edges', () => {
+      const { addBlock, batchAddEdges } = useWorkflowStore.getState()
+
+      addBlock('block-1', 'starter', 'Start', { x: 0, y: 0 })
+      addBlock('block-2', 'function', 'End', { x: 200, y: 0 })
+
+      batchAddEdges([{ id: 'e1', source: 'block-1', target: 'block-2' }])
+      batchAddEdges([{ id: 'e2', source: 'block-1', target: 'block-2' }])
+
+      const state = useWorkflowStore.getState()
+      expectEdgeCount(state, 1)
+    })
+
     it('should prevent self-referencing edges', () => {
       const { addBlock, batchAddEdges } = useWorkflowStore.getState()
 

apps/sim/stores/workflows/workflow/store.ts

@@ -506,6 +506,16 @@ export const useWorkflowStore = create<WorkflowStore>()(
           // Skip self-referencing edges
           if (edge.source === edge.target) continue
 
+          // Skip if identical connection already exists (same ports)
+          const connectionExists = newEdges.some(
+            (e) =>
+              e.source === edge.source &&
+              e.sourceHandle === edge.sourceHandle &&
+              e.target === edge.target &&
+              e.targetHandle === edge.targetHandle
+          )
+          if (connectionExists) continue
+
           // Skip if would create a cycle
           if (wouldCreateCycle([...newEdges], edge.source, edge.target)) continue