Laravel Vuejs 实战:开发知乎 定义话题与问题关系
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1.话题【Topic】
执行命令:
1 php artisan make:model Topic –cmr
修改****_**_**_create_topics_table.php数据库迁移文件如下:
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
修改Topic.php文件如下:
1 class Topic extends Model 2 { 3 // 4 protected $fillable = [‘name‘, ‘questions_count‘]; 5 6 } 7
2.处理话题与问题之间的关联关系【多对多】
单独建一个数据库迁移文件存储话题与问题之间的关系;
创建这个数据库迁移文件,执行命令:
1 php artisan make:migration create_questions_topics_table --create=questions_topics
修改 ****_create_questions_topics_table.php数据库迁移文件:
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
执行命令建数据表:
1 php artisan migrate
3.定义模型Model之间的关联关系:
具体原理及更多介绍看官方文档:模型关联
也有英文版的样例介绍:
larashout网站的:
Laravel One to One Eloquent Relationship Tutorial
Laravel One to Many Eloquent Relationship Tutorial
Laravel Many to Many Eloquent Relationship Tutorial
Laravel Has Many Through Eloquent Relationship Tutorial
修改Topic.php文件:
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
修改Question.php文件:
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
话题与问题关系建立完成。
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