How Laravel Developers Can Build Shared-Database Multi-Tenancy Safely
A Laravel developer has detailed the foundation layer for shared-database multi-tenancy, an architecture where all organisations share one database with rows tagged by tenant_id. The approach relies on three components: a TenantContext singleton, a BelongsToTenant trait, and composite unique constraints to enforce data boundaries. The trait automatically applies a global query scope on reads and fills tenant_id on writes, reducing the risk of one tenant accidentally accessing another's data. Unique constraints are split by purpose — human-readable identifiers are scoped per tenant, while security tokens remain globally unique to prevent collision-based attacks. A CI test that detects models missing the required trait serves as the primary guardrail, replacing reliance on developer discipline alone.
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