// Package models defines the data models used by the chat application.
// All model structs embed Base, which provides database access for
// relation-fetching methods directly on model instances.
package models

import "database/sql"

// DB is the interface that models use to query the database.
// This avoids a circular import with the db package.
type DB interface {
	GetDB() *sql.DB
}

// Base is embedded in all model structs to provide database access.
type Base struct {
	db DB
}

// SetDB injects the database reference into a model.
func (b *Base) SetDB(d DB) {
	b.db = d
}

// GetDB returns the database interface for use in model methods.
func (b *Base) GetDB() *sql.DB {
	return b.db.GetDB()
}