未创建外键

Posted 2023-01-19

我正在尝试在教师表中创建外键。迁移后，所有列都在那里，但未创建外键

首先，我创建了两个表，分别是用户表和课程表。

if(! Schema::hasTable('users')) 
            Schema::create('users', function (Blueprint $table) 
                $table->increments('id');
                $table->string('name');
                $table->string('email');
                $table->string('password');
                $table->string('remember_token')->nullable();

                $table->timestamps();

            );
        

if(! Schema::hasTable('courses')) 
            Schema::create('courses', function (Blueprint $table) 
                $table->increments('id');
                $table->string('title');
                $table->string('slug')->nullable();
                $table->text('description')->nullable();
                $table->decimal('price', 15, 2)->nullable();
                $table->string('course_image')->nullable();
                $table->date('start_date')->nullable();
                $table->tinyInteger('published')->nullable()->default(0);

                $table->timestamps();
                $table->softDeletes();

                $table->index(['deleted_at']);
            );
        

然后我用外键创建了另一个表，称为“老师”

if(! Schema::hasTable('teacher')) 
            Schema::create('teacher', function (Blueprint $table) 
                $table->increments('id');
                $table->integer('user_id')->unsigned();
                $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
                $table->integer('course_id')->unsigned();
                $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
                $table->string('teachers_image')->nullable();
                $table->text('education')->nullable();
                $table->text('contact')->nullable();

                $table->timestamps();
                $table->softDeletes();

            );
        

迁移后，我可以看到表在那里，但未创建外键

答案

尝试一下

if(! Schema::hasTable('teacher')) 
            Schema::create('teacher', function (Blueprint $table) 
                $table->increments('id');
                $table->unsignedInteger('user_id');
                $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
                $table->unsignedInteger('course_id');
                $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
                $table->string('teachers_image')->nullable();
                $table->text('education')->nullable();
                $table->text('contact')->nullable();

                $table->timestamps();
                $table->softDeletes();

            );