Yii2 hasOne(), hasMany() ʵÏÖÈý±í¹ØÁªµÄ·½·¨(Á½ÖÖ)

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ÏÖÓÐ group £¨×e£(C)ºÍ user (Óû§) Á½ÖÖʵÀý¡£

Ò»¸o group ÖпÉÒÔÓµÓжa¸o user£¬Ò»¸o user Ò²¿ÉÒÔÊoÓÚÓжa¸o group £¨¶a¶Ô¶a¹Øϵ£(C)

GroupUserRelation ±iÓÃÓÚ°o¶¨×eºÏ×eÔ±µÄ¹Øϵ£¨Ê¹ÓÃid°o¶¨£(C)

×Ö¶ÎÓÐ id, group_id, user_id

ÏÖÓÐUser(Óû§)±i£¬ ÐeÒª»ñÈ¡ ÆaËuÊoµÄËuÓÐÓû§×eµÄÐÅÏ¢£¬ÐeҪʹÓÃhasMany()½øÐжa±i¹ØÁª¡£

    User.id => GroupUserRelation.user_id
    GroupUserRelation.group_id => Group.id

½¨1

    public function getGroup()
    {
      return $this->hasMany(Group::className(), ['id' => 'group_id'])
         ->viaTable(GroupUserRelation::tableName(), ['user_id' => 'id']);
    }

½¨2

    public function getGroup()
    {
      return $this->hasMany(Group::className(), ['id' => 'group_id'])
         ->viaTable('groupUserRelation');
    }
    public function getGroupUserRelation()
    {
      return $this->hasMany(GroupUserRelation::tableName(), ['user_id' => 'id']);
    }

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