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Build the marketplace’s durable business records in PostgreSQL through Laravel, and keep temporary interface choices in React. When the screen shows the wrong value, inspect the component that renders it, trace the value to its owner, and check whether the problem is state ownership, a render snapshot, mutation, or duplicated state. These are related concerns, but a React state bug is not by itself evidence that a database write failed.
Separate durable marketplace data from temporary UI state
Use PostgreSQL for records the application must retain, such as orders and their line items; use React state for values needed to render and coordinate the current interface. A selected product, open menu, or unsaved form choice may be UI state, while a completed order is a business record. The exact boundary depends on what the marketplace must preserve.
Laravel 13.x lists PostgreSQL as a supported database and offers raw SQL, the query builder, and Eloquent for database interaction. That support does not prescribe a marketplace schema: decide which records and relationships the business needs before designing tables. See Laravel’s database documentation.
Payment processing, seller payouts, inventory reservation policy, shipping, taxes, dispute handling, and launch jurisdictions are separate project decisions. The framework and React guidance discussed here do not choose those policies.
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Use Laravel transactions for related database writes
When a set of database changes must succeed or fail as one application operation, put those writes in a transaction. For example, creating an order and its associated line items may need to be treated as one unit: an order without its intended lines could leave the application in an inconsistent business state. This is an application design decision, not an automatic marketplace feature.
Laravel’s transaction wrapper commits when its closure completes successfully. If an exception escapes the closure, Laravel rolls back the work and rethrows the exception. The transaction API can also retry after a deadlock when retry attempts are configured. See Laravel’s database documentation.
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Be cautious about placing external side effects—such as a remote service call—inside a retryable transaction closure. A database retry can run the closure again, so an external action could be repeated. Keep the database unit clear and handle external work in a way that accounts for retry behavior.
Check connection behavior for reads and operations
A read immediately after a write can depend on how Laravel’s database connections are configured. With the optional sticky setting, Laravel sends subsequent reads to the write connection after a write during the same request cycle. This is a bounded read-after-write behavior, not a guarantee that every later request or every deployment setup will read from the writer.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIf PostgreSQL is behind transaction-mode pooling, distinguish ordinary application queries from schema and maintenance work. Laravel’s current database documentation says some schema operations, migrations, and maintenance commands need a direct database connection, and documents pooled and direct connection configuration. Whether this applies depends on the database host and deployment configuration; do not assume every PostgreSQL service uses transaction-mode pooling.
For basic inspection, Laravel documents db:show and db:table as tools for viewing the configured database and its tables. Migration guidance is in Laravel’s database and migrations documentation.
Debug React state by tracing the displayed value
Start with the component that displays the incorrect text, selection, or status. React Developer Tools lets you inspect components, props, and state in its Components panel; its Profiler panel is available when you need to examine rendering behavior. From the displayed value, trace backward to the prop or state variable that supplies it, then find the component that owns and updates that value. See React Developer Tools.
- Inspect the component. In React Developer Tools, find the component rendering the wrong value and examine its current props and state.
- Follow the value to its owner. Determine which component declares the state or supplies the prop. State belongs to the component instance that declares it.
- Check the handler’s render snapshot. A setter requests a render; it does not change the state variable already captured by the current handler. A timeout or promise callback created by that handler can therefore read the value from the render in which the handler was created.
- Check for mutation. Treat props and state as immutable snapshots. Update through the relevant setter or pass a new value rather than mutating an object held in state or received as a prop. See React’s guidance on component and Hook purity.
- Look for competing copies. Check whether a selected record, derived total, or other value is stored in more than one place when it could be derived from existing state or props.
- Check coordination across siblings. If components that should reflect one shared choice show different answers, see whether they each own independent copies of that choice.
React describes state as a snapshot for each render. If a handler calls a setter and then reads the same state variable, that read still refers to the handler’s current render; the next render receives the updated value. This explains many reports that React state “does not update immediately” or that a callback sees stale state. It does not mean the setter changed the variable partway through the already-running handler. Read React’s state-as-a-snapshot explanation.
Choose local or shared state according to who needs it
Keep a value local when one component owns the interaction. When multiple components need to coordinate the same piece of UI state, React recommends moving that state to their closest common parent and passing the value and event handlers down. This gives those consumers one shared owner without requiring every piece of application state to live at the top of the tree. See React’s guide to sharing state between components.
| Choice | Useful when | Trade-off to check |
|---|---|---|
| Local state | One component owns and uses the value. | It will not automatically coordinate a separate component’s independent state. |
| State in the closest common parent | Sibling components need to show or update the same choice. | The parent must pass the shared value and handlers to the components that need them. |
Also avoid storing redundant or contradictory values. If a selected item can be identified by an ID and found in an existing list, storing a duplicate full object may allow the two copies to diverge. Likewise, a total that can be calculated from its inputs may not need its own state. Whether an identifier or a derived value is appropriate depends on the UI, but React’s guidance is to structure state so that one fact does not acquire unnecessary competing representations. See React’s state-structure guide.
Keep the database and UI diagnoses distinct
If a page appears to show an old order status, first establish which layer is wrong. Inspect the React component’s props and state, then trace the displayed value to the response or data source feeding it. Separately verify whether the Laravel operation completed and whether the relevant query is reading from the expected connection. Laravel’s optional sticky reads apply after a write within the same request cycle; they do not make a UI update happen or settle cross-request consistency.
React state describes the interface’s current rendered data, while a Laravel transaction governs a group of database changes. A setter does not commit a database transaction, and a successful transaction does not by itself guarantee that a component is rendering the latest value. Debug each boundary on its own evidence: inspect the component and state owner on the client, and verify the database operation and connection configuration on the server.
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