文章目錄

• • • • 前言
      • model->created_at 為啥是 Carbon對象
      • model->toArray()['created_at'] 為啥是國際標準時間
      • 可以通過重寫 serializeDate 來轉換toArray返回的時間格式(Y-m-d H:i:s)

前言

model->created_at 是 Illuminate\Support\Carbon 對象model->toArray()['created_at'] 是字符串(國際標準時間)

model->created_at 為啥是 Carbon對象

model->created_at 觸發魔術方法 __get()

namespace Illuminate\Database\Eloquent;use ArrayAccess; use Illuminate\Contracts\Broadcasting\HasBroadcastChannel; use Illuminate\Contracts\Queue\QueueableCollection; use Illuminate\Contracts\Queue\QueueableEntity; use Illuminate\Contracts\Routing\UrlRoutable; use Illuminate\Contracts\Support\Arrayable; use Illuminate\Contracts\Support\CanBeEscapedWhenCastToString; use Illuminate\Contracts\Support\Jsonable; use Illuminate\Database\ConnectionResolverInterface as Resolver; use Illuminate\Database\Eloquent\Collection as EloquentCollection; use Illuminate\Database\Eloquent\Relations\BelongsToMany; use Illuminate\Database\Eloquent\Relations\Concerns\AsPivot; use Illuminate\Database\Eloquent\Relations\HasManyThrough; use Illuminate\Database\Eloquent\Relations\Pivot; use Illuminate\Support\Arr; use Illuminate\Support\Collection as BaseCollection; use Illuminate\Support\Str; use Illuminate\Support\Traits\ForwardsCalls; use JsonSerializable; use LogicException;abstract class Model implements Arrayable, ArrayAccess, CanBeEscapedWhenCastToString, HasBroadcastChannel, Jsonable, JsonSerializable, QueueableEntity, UrlRoutable {use Concerns\HasAttributes,Concerns\HasEvents,Concerns\HasGlobalScopes,Concerns\HasRelationships,Concerns\HasTimestamps,Concerns\HidesAttributes,Concerns\GuardsAttributes,ForwardsCalls;public function __get($key){return $this->getAttribute($key);} }

2.調用 HasAttributes的getAttribute方法,getAttributeValue方法 取得value值

• 判斷模型timestamps屬性,false 返回原始value
• 然后判斷字段key是否在模型的static::CREATED_AT | static::UPDATED_AT
• 這兩個值默認是 create_at | updated_at 可以通過模型重新設置這兩個屬性
• 在的話就使用transformModelValue將 value轉換成 Carbon 對象

namespace Illuminate\Database\Eloquent\Concerns;use Carbon\CarbonImmutable; use Carbon\CarbonInterface; use DateTimeInterface; use Illuminate\Contracts\Database\Eloquent\Castable; use Illuminate\Contracts\Database\Eloquent\CastsInboundAttributes; use Illuminate\Contracts\Support\Arrayable; use Illuminate\Database\Eloquent\Casts\AsArrayObject; use Illuminate\Database\Eloquent\Casts\AsCollection; use Illuminate\Database\Eloquent\Casts\Attribute; use Illuminate\Database\Eloquent\InvalidCastException; use Illuminate\Database\Eloquent\JsonEncodingException; use Illuminate\Database\Eloquent\Relations\Relation; use Illuminate\Database\LazyLoadingViolationException; use Illuminate\Support\Arr; use Illuminate\Support\Carbon; use Illuminate\Support\Collection as BaseCollection; use Illuminate\Support\Facades\Crypt; use Illuminate\Support\Facades\Date; use Illuminate\Support\Str; use InvalidArgumentException; use LogicException; use ReflectionClass; use ReflectionMethod; use ReflectionNamedType;trait HasAttributes {public function getAttribute($key){if (! $key) {return;}// If the attribute exists in the attribute array or has a "get" mutator we will// get the attribute's value. Otherwise, we will proceed as if the developers// are asking for a relationship's value. This covers both types of values.if (array_key_exists($key, $this->attributes) ||array_key_exists($key, $this->casts) ||$this->hasGetMutator($key) ||$this->hasAttributeMutator($key) ||$this->isClassCastable($key)) {return $this->getAttributeValue($key);}// Here we will determine if the model base class itself contains this given key// since we don't want to treat any of those methods as relationships because// they are all intended as helper methods and none of these are relations.if (method_exists(self::class, $key)) {return;}return $this->getRelationValue($key);}public function getAttributeValue($key){return $this->transformModelValue($key, $this->getAttributeFromArray($key));}protected function transformModelValue($key, $value){// If the attribute has a get mutator, we will call that then return what// it returns as the value, which is useful for transforming values on// retrieval from the model to a form that is more useful for usage.if ($this->hasGetMutator($key)) {return $this->mutateAttribute($key, $value);} elseif ($this->hasAttributeGetMutator($key)) {return $this->mutateAttributeMarkedAttribute($key, $value);}// If the attribute exists within the cast array, we will convert it to// an appropriate native PHP type dependent upon the associated value// given with the key in the pair. Dayle made this comment line up.if ($this->hasCast($key)) {return $this->castAttribute($key, $value);}// If the attribute is listed as a date, we will convert it to a DateTime// instance on retrieval, which makes it quite convenient to work with// date fields without having to create a mutator for each property.# 主要看這里if ($value !== null&& \in_array($key, $this->getDates(), false)) {return $this->asDateTime($value);}return $value;}public function getDates(){if (! $this->usesTimestamps()) {return $this->dates;}$defaults = [$this->getCreatedAtColumn(),$this->getUpdatedAtColumn(),];return array_unique(array_merge($this->dates, $defaults));}public function getDates(){if (! $this->usesTimestamps()) {return $this->dates;}$defaults = [$this->getCreatedAtColumn(),$this->getUpdatedAtColumn(),];return array_unique(array_merge($this->dates, $defaults));}protected function asDateTime($value){// If this value is already a Carbon instance, we shall just return it as is.// This prevents us having to re-instantiate a Carbon instance when we know// it already is one, which wouldn't be fulfilled by the DateTime check.if ($value instanceof CarbonInterface) {return Date::instance($value);}// If the value is already a DateTime instance, we will just skip the rest of// these checks since they will be a waste of time, and hinder performance// when checking the field. We will just return the DateTime right away.if ($value instanceof DateTimeInterface) {return Date::parse($value->format('Y-m-d H:i:s.u'), $value->getTimezone());}// If this value is an integer, we will assume it is a UNIX timestamp's value// and format a Carbon object from this timestamp. This allows flexibility// when defining your date fields as they might be UNIX timestamps here.if (is_numeric($value)) {return Date::createFromTimestamp($value);}// If the value is in simply year, month, day format, we will instantiate the// Carbon instances from that format. Again, this provides for simple date// fields on the database, while still supporting Carbonized conversion.if ($this->isStandardDateFormat($value)) {return Date::instance(Carbon::createFromFormat('Y-m-d', $value)->startOfDay());}$format = $this->getDateFormat();// Finally, we will just assume this date is in the format used by default on// the database connection and use that format to create the Carbon object// that is returned back out to the developers after we convert it here.try {$date = Date::createFromFormat($format, $value);} catch (InvalidArgumentException $e) {$date = false;}return $date ?: Date::parse($value);} }

model->toArray()[‘created_at’] 為啥是國際標準時間

1.toArray() 調用了 Illuminate/Database/Eloquent/Concerns/HasAttributes.php 的 attributesToArray方法
2.attributesToArray 調用 addDateAttributesToArray

• addDateAttributesToArray 中判斷 判斷模型timestamps屬性,false 跳過處理
• 判斷 key 是否在 static::CREATED_AT | static::UPDATED_AT中,不在 跳過處理
• 將value處理成Carbon對象

3.通過serializeDate(Carbon) 將Carbon處理成國際標準時間

可以通過重寫 serializeDate 來轉換toArray返回的時間格式(Y-m-d H:i:s)

namespace App\Models\Auth;use App\Models\Traits\RichSoftDeletes; use DateTimeInterface;class User extends \Illuminate\Database\Eloquent\Model {use RichSoftDeletes;protected $fillable = ['name', 'mobile', 'password', 'creator', 'updater'];protected $hidden = ['mobile'];protected $casts = ['id' => 'string','creator' => 'boolean',];public function toArray(){$res = parent::toArray();$values = array_values($res);$keys = array_keys($res);$keys = array_map(function ($key) {return ucfirst($key);}, $keys);return array_combine($keys, $values);}public function serializeDate(DateTimeInterface $date){return $date->format('Y-m-d H:i:s');} }

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