Fix: Prisma Unique Constraint Failed on the Fields
How to fix Prisma's 'Unique constraint failed on the fields' error — finding which field caused it, handling upserts, race conditions, and bulk insert deduplication.
All Articles
839 articles — Page 44 of 70
Fix: Pydantic ValidationError — Field Required / Value Not Valid
How to fix Pydantic ValidationError in Python — missing required fields, wrong types, custom validators, handling optional fields, v1 vs v2 API differences, and debugging complex nested models.
Fix: React useEffect Runs Twice in Development
Why React useEffect runs twice in development with Strict Mode, how to handle the double invocation correctly, when to add cleanup functions, and when the double-run actually reveals a real bug.
Fix: TypeScript Decorators Not Working (experimentalDecorators)
How to fix TypeScript decorators not applying — experimentalDecorators not enabled, emitDecoratorMetadata missing, reflect-metadata not imported, and decorator ordering issues.
Fix: TypeScript Enum Not Working — const enum, isolatedModules, and Runtime Issues
How to fix TypeScript enum problems — const enum with isolatedModules, enums not available at runtime, string vs numeric enums, and migrating to union types or as const objects.
Fix: Vite Environment Variables Not Working
How to fix Vite environment variables showing as undefined — missing VITE_ prefix, wrong .env file for the mode, import.meta.env vs process.env, TypeScript types, and SSR differences.
Fix: AWS CloudWatch Logs Not Appearing
How to fix AWS CloudWatch logs not showing up — IAM permissions missing, log group not created, log stream issues, CloudWatch agent misconfiguration, and Lambda log delivery delays.
Fix: CSS Custom Properties (Variables) Not Working or Not Updating
How to fix CSS custom properties not applying — wrong scope, missing fallback values, JavaScript not setting variables on the right element, and how CSS variables interact with media queries and Shadow DOM.
Fix: Spring Boot "The dependencies of some of the beans in the application context form a cycle"
How to fix Spring Boot circular dependency errors — BeanCurrentlyInCreationException, refactoring to break cycles, @Lazy injection, setter injection, and @PostConstruct patterns.
Fix: Spring Security Returning 403 Forbidden Unexpectedly
How to fix Spring Security 403 Forbidden errors, CSRF token missing, incorrect security configuration, method security blocking requests, and how to debug the Spring Security filter chain.
Fix: Kubernetes ConfigMap Changes Not Reflected in Running Pods
How to fix Kubernetes ConfigMap updates not reaching running pods — why pods don't see updated values, how to trigger restarts, use live volume mounts, and automate ConfigMap rollouts with Reloader.
Fix: MongoDB "not primary" Write Error (Replica Set)
How to fix MongoDB 'not primary' errors when writing to a replica set, read preference misconfiguration, connecting to a secondary, replica set elections, and write concern settings.