Laravel Vuejs 实战：开发知乎 （9）定义话题与问题关系

  1 php artisan make:model Topic –cmr

  1 class CreateTopicsTable extends Migration
  2 {
  3     /**
  4      * Run the migrations.
  5      *
  6      * @return void
  7      */
  8     public function up()
  9     {
 10         Schema::create(‘topics‘, function (Blueprint $table) {
 11             $table->bigIncrements(‘id‘);
 12             $table->string(‘name‘);
 13             $table->text(‘content‘)->nullable();
 14             $table->integer(‘questions_count‘)->default(0);
 15             $table->integer(‘followers_count‘)->default(0);
 16             $table->timestamps();
 17         });
 18     }
 19 
 20     /**
 21      * Reverse the migrations.
 22      *
 23      * @return void
 24      */
 25     public function down()
 26     {
 27         Schema::dropIfExists(‘topics‘);
 28     }
 29 }
 30 

  1 class Topic extends Model
  2 {
  3     //
  4     protected $fillable = [‘name‘, ‘questions_count‘];
  5 
  6 }
  7 

  1 php artisan make:migration create_questions_topics_table --create=questions_topics

  1 class CreateQuestionsTopicsTable extends Migration
  2 {
  3     /**
  4      * Run the migrations.
  5      *
  6      * @return void
  7      */
  8     public function up()
  9     {
 10         Schema::create(‘questions_topics‘, function (Blueprint $table) {
 11             $table->bigIncrements(‘id‘);
 12             $table->bigInteger(‘question_id‘)->unsigned()->index();
 13             $table->bigInteger(‘topic_id‘)->unsigned()->index();
 14             $table->timestamps();
 15         });
 16     }
 17 
 18     /**
 19      * Reverse the migrations.
 20      *
 21      * @return void
 22      */
 23     public function down()
 24     {
 25         Schema::dropIfExists(‘questions_topics‘);
 26     }
 27 }
 28 

  1 php artisan migrate

  1 class Topic extends Model
  2 {
  3     //
  4     protected $fillable = [‘name‘, ‘questions_count‘];
  5 
  6 
  7     public function questions()
  8     {
  9         return $this->belongsToMany(
 10             Question::class,
 11             ‘questions_topics‘ //表名我设置的是questions_topics，可能不是系统自动解析的question_topic
 12         )->withTimestamps();//withTimestamps操作questions_topics表中create_at及updated_at字段的;
 13     }
 14 }
 15 

  1 class Question extends Model
  2 {
  3     //
  4     protected $fillable = [‘title‘, ‘content‘, ‘user_id‘];
  5 
  6     public function topics()
  7     {
  8         return $this->belongsToMany(
  9             Topic::class,
 10             ‘questions_topics‘ //表名我设置的是questions_topics，可能不是系统自动解析的question_topic
 11         )->withTimestamps();//withTimestamps操作questions_topics表中create_at及updated_at字段的
 12     }
 13 }
 14