1.执行命令
1 php artisan make:model Answer –cmrf 一次性把model，及对应的controller migration factory 创建好，并且controller配置设置为resource
2.修改****_**_**_******_create_answers_table.php：
1 <?php 2 3 use IlluminateDatabaseMigrationsMigration; 4 use IlluminateDatabaseSchemaBlueprint; 5 use IlluminateSupportFacadesSchema; 6 7 class CreateAnswersTable extends Migration 8 { 9 /** 10 * Run the migrations. 11 * 12 * @return void 13 */ 14 public function up() 15 { 16 Schema::create('answers', function (Blueprint $table) { 17 $table->bigIncrements('id'); 18 $table->unsignedBigInteger('user_id')->index()->comment("答案是哪个用户创建的"); 19 $table->unsignedBigInteger('question_id')->index()->comment("答案是回答的哪个问题"); 20 $table->text('content')->comment("答案的具体内容"); 21 $table->integer('votes_count')->default(0)->comment("点赞总数"); 22 $table->integer('comments_count')->default(0)->comment("回复总数"); 23 $table->string('is_hidden', 8)->default("F")->comment("回答状态是否被隐藏，默认设置长度必须大于8");//默认设置长度必须大于8，否则不被赋值F，即被隐藏 24 $table->string('close_comment')->default('F')->comment("回答是否被关闭评论");//默认F代表否，即不关闭，如果需要关闭设置为 T 25 $table->softDeletes()->comment("支持软删除"); 26 $table->timestamps(); 27 }); 28 } 29 30 /** 31 * Reverse the migrations. 32 * 33 * @return void 34 */ 35 public function down() 36 { 37 Schema::dropIfExists('answers'); 38 } 39 }
运行数据库迁移，执行：
1 php artisan migrate
对Answer 模型添加
1 protected $fillable = ['user_id', 'question_id', 'content'];防止 massAssignmentException
3. 模型关联关系：
Answer，Question，User 之间的模型关联关系需要在各自Model类文件定义：
1 <?php 2 3 namespace App; 4 5 use AppModelsQuestion; 6 use IlluminateDatabaseEloquentModel; 7 use IlluminateDatabaseEloquentSoftDeletes; 8 9 class Answer extends Model 10 { 11 #region 支持软删除添加 12 use SoftDeletes; 13 protected $dates = ['deleted_at']; 14 15 #endregion 16 17 protected $fillable = ['user_id', 'question_id', 'content']; 18 19 /** 一个回答只有一个回答主人 20 * @return IlluminateDatabaseEloquentRelationsBelongsTo 21 */ 22 public function user() 23 { 24 return $this->belongsTo(User::class); 25 } 26 27 /** 一个回答只针对一个问题 28 * @return IlluminateDatabaseEloquentRelationsBelongsTo 29 */ 30 public function question() 31 { 32 return $this->belongsTo(Question::class); 33 } 34 35 } 36
1 <?php 2 3 namespace AppModels; 4 5 use AppAnswer; 6 use AppTopic; 7 use AppUser; 8 use IlluminateDatabaseEloquentModel; 9 use IlluminateDatabaseEloquentSoftDeletes; 10 11 class Question extends Model 12 { 13 //软删除 添加 14 use SoftDeletes; 15 // 16 protected $fillable = ['title', 'content', 'user_id']; 17 //支持软删除 添加 18 protected $dates = ['deleted_at']; 19 20 public function topics() 21 { 22 return $this->belongsToMany( 23 Topic::class, 24 'questions_topics' //表名我设置的是questions_topics，可能不是系统自动解析的question_topic 25 )->withTimestamps();//withTimestamps操作questions_topics表中create_at及updated_at字段的 26 } 27 28 public function user() 29 { 30 return $this->belongsTo(User::class); 31 } 32 33 /** scope+请求名命名的 34 * @return bool 35 */ 36 public function scopePublished($query) 37 { 38 return $query->where('is_hidden', 'F');//等于F表示不隐藏 39 } 40 41 42 /** 一个问题有多个回答 43 * @return IlluminateDatabaseEloquentRelationsHasMany 44 */ 45 public function answers() 46 { 47 return $this->hasMany(Answer::class); 48 } 49 50 } 51
1 <?php 2 3 namespace App; 4 5 use AppModelsQuestion; 6 use IlluminateContractsAuthMustVerifyEmail; 7 use IlluminateFoundationAuthUser as Authenticatable; 8 use IlluminateNotificationsNotifiable; 9 10 class User extends Authenticatable implements MustVerifyEmail 11 { 12 use Notifiable; 13 14 /** 15 * The attributes that are mass assignable. 16 * 17 * @var array 18 */ 19 protected $fillable = [ 20 'name', 'email', 'password', 'avatar', 'activation_token' 21 ]; 22 23 /** 24 * The attributes that should be hidden for arrays. 25 * 26 * @var array 27 */ 28 protected $hidden = [ 29 'password', 'remember_token', 30 ]; 31 32 /** 33 * The attributes that should be cast to native types. 34 * 35 * @var array 36 */ 37 protected $casts = [ 38 'email_verified_at' => 'datetime', 39 ]; 40 41 42 /**添加用户模型和问题模型的模型关联 43 * @return IlluminateDatabaseEloquentRelationsHasMany 44 */ 45 public function questions() 46 { 47 return $this->hasMany(Question::class); 48 } 49 50 51 /** 添加用户模型和回答模型的模型关联 一个用户可以有多个回答 52 * @return IlluminateDatabaseEloquentRelationsHasMany 53 */ 54 public function answers() 55 { 56 return $this->hasMany(Answer::class); 57 } 58 } 59 60
补充Question，User 各自数据表中缺少的字段：
注意：Question迁移是否需要处理foreign key onDelete，问题被删除的时候，回答也会删除？
不删除，因为答主应该还可以查看，等于把问题页面隐藏了，这样外界没有从问题查看回答内容的入口，但是答主自己可以看
执行：
1 php artisan make:migration add_answer_id_to_users_table --table=users修改 ****_add_answer_id_to_users_table.php
注：补充一下让用户也支持软删除：User.php中记得添加：
1 #region 支持软删除 2 use SoftDeletes; 3 protected $dates = ['deleted_at']; 4 #endregion 5User.php:
User.php1 <?php 2 3 namespace App; 4 5 use AppModelsQuestion; 6 use IlluminateContractsAuthMustVerifyEmail; 7 use IlluminateDatabaseEloquentSoftDeletes; 8 use IlluminateFoundationAuthUser as Authenticatable; 9 use IlluminateNotificationsNotifiable; 10 11 class User extends Authenticatable implements MustVerifyEmail 12 { 13 use Notifiable; 14 #region 支持软删除 15 use SoftDeletes; 16 protected $dates = ['deleted_at']; 17 #endregion 18 /** 19 * The attributes that are mass assignable. 20 * 21 * @var array 22 */ 23 protected $fillable = [ 24 'name', 'email', 'password', 'avatar', 'activation_token' 25 ]; 26 27 /** 28 * The attributes that should be hidden for arrays. 29 * 30 * @var array 31 */ 32 protected $hidden = [ 33 'password', 'remember_token', 34 ]; 35 36 /** 37 * The attributes that should be cast to native types. 38 * 39 * @var array 40 */ 41 protected $casts = [ 42 'email_verified_at' => 'datetime', 43 ]; 44 45 46 /**添加用户模型和问题模型的模型关联 47 * @return IlluminateDatabaseEloquentRelationsHasMany 48 */ 49 public function questions() 50 { 51 return $this->hasMany(Question::class); 52 } 53 54 55 /** 添加用户模型和回答模型的模型关联 一个用户可以有多个回答 56 * @return IlluminateDatabaseEloquentRelationsHasMany 57 */ 58 public function answers() 59 { 60 return $this->hasMany(Answer::class); 61 } 62 } 63 64
1 <?php 2 3 use IlluminateDatabaseMigrationsMigration; 4 use IlluminateDatabaseSchemaBlueprint; 5 use IlluminateSupportFacadesSchema; 6 7 class AddAnswerIdToUsersTable extends Migration 8 { 9 /** 10 * Run the migrations. 11 * 12 * @return void 13 */ 14 public function up() 15 { 16 Schema::table('users', function (Blueprint $table) { 17 // 18 $table->unsignedBigInteger('answer_id')->nullable()->comment("用户回答的答案id");//用户可以没有回答过任何问题 19 //补一下 支持软删除 20 $table->softDeletes(); 21 }); 22 } 23 24 /** 25 * Reverse the migrations. 26 * 27 * @return void 28 */ 29 public function down() 30 { 31 Schema::table('users', function (Blueprint $table) { 32 // 33 $table->dropColumn('answer_id'); 34 }); 35 } 36 } 37
执行：
1 php artisan make:migration add_answer_id_to_questions_table --table=questions修改：****_add_answer_id_to_questions_table.php
1 <?php 2 3 use IlluminateDatabaseMigrationsMigration; 4 use IlluminateDatabaseSchemaBlueprint; 5 use IlluminateSupportFacadesSchema; 6 7 class AddAnswerIdToQuestionsTable extends Migration 8 { 9 /** 10 * Run the migrations. 11 * 12 * @return void 13 */ 14 public function up() 15 { 16 Schema::table('questions', function (Blueprint $table) { 17 // 18 $table->unsignedBigInteger('answer_id')->nullable()->comment("问题下回答的答案id");//问题可以没有任何回答 19 }); 20 } 21 22 /** 23 * Reverse the migrations. 24 * 25 * @return void 26 */ 27 public function down() 28 { 29 Schema::table('questions', function (Blueprint $table) { 30 // 31 $table->dropColumn('answer_id'); 32 }); 33 } 34 }
执行：
1 php artisan migrate完成数据库迁移文件的运行。