我需要根據性別條件顯示復制品再現表：$table->bigIncrements('id');$table->unsignedInteger('father_id');$table->unsignedInteger('mother_id');...我需要根據性別檢索復制品用戶.phppublic function reproductions(){ if($this->gender == 'm'){ return $this->hasMany(Reproduction::class, 'father_id'); }else{ return $this->hasMany(Reproduction::class, 'mother_id'); }}再現表：id father_id mother_id1 1 22 1 33 1 4當我檢索 ID 為 1 的用戶的復制品時，它需要顯示 3 個復制品，但它返回 null 集合$firstUser = User::find(1); // User Id with 1 has gender mdd($firstUser->reproductions->count()); // Should return 3 but returns null collection
1 回答
動漫人物
TA貢獻1815條經驗 獲得超10個贊
您可以創建兩種不同的關系。
public function maleReproductions(){
return $this->hasMany(Reproduction::class, 'father_id');
}
public function feMaleReproductions(){
return $this->hasMany(Reproduction::class, 'mother_id');
}
現在基于$user你可以附加關系。
$productions = [];
$user = User::where('id',1)->first();
if($user->gender == 'm'){
$productions = $user->maleProductions;
} else {
$productions = $user->feMaleProductions;
}
對于用戶集合，附加兩者的關系。并根據條件訪問特定的內容。
$users = User::with('maleReproductions', 'femaleReproductions')->get();
foreach($users as $user){
if($user->gender == 'm'){
$productions = $user->maleProductions;
} else {
$productions = $user->feMaleProductions;
}
}
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