如何重构实现相同方法的两个模型类

Question

给定两个 class 扩展模型的模型，它是 Eloquent\Model 的扩展，具有完全相同的复制粘贴方法。提取此重复方法的推荐方法是什么？一个抽象 class 和扩展模型的方法，然后两个 classes 都可以扩展，或者一个 Trait 来散布在功能中？两个 classes 的名称非常相似，但在我们系统中的用途不同。命名建议也很受欢迎。

下面是 classes 但只粘贴了相似之处。 SQL 视图 class 使用 SQL 视图来消除对属性的需要，它允许它与系统的其他部分一起使用。

getExpirationMessageAttribute

<?php
class SupplierDocument extends Model {
    use HasFactory, Taskable;

    protected $appends = ['days_till_expiry', 'expiration_status', 'expiration_message'];

    public function owner() {
        return $this->belongsTo(User::class, 'owner_id');
    }

    public function facilities() {
        return $this->belongsToMany(Facility::class, 'supplier_document_facilities');
    }



    /**
     * Document expiration status.
     *
     * @return string
     */
    public function getExpirationStatusAttribute() {
        if (! $this->load('type')->type->is_expirable) {
            return DocumentStatusEnum::NotExpirable;
        }

        if (Carbon::parse($this->expires_at)->isPast()) {
            return DocumentStatusEnum::Expired;
        }

        if (Carbon::parse($this->expires_at)->diffInDays(now()) <= $this->type->expiration_window) {
            return DocumentStatusEnum::ExpiringSoon;
        }

        return DocumentStatusEnum::Active;
    }

    /**
     * Document days till expiration.
     *
     * @return string
     */
    public function getDaysTillExpiryAttribute() {
        if ($this->expires_at) {
            return Carbon::parse($this->expires_at)->diffInDays(Carbon::now()->toDateString());
        }
    }

    /**
     * Document expiration message.
     *
     * @return string
     */
    public function getExpirationMessageAttribute() {
        if ($this->expiration_status === DocumentStatusEnum::ExpiringSoon) {
            if ($this->days_till_expiry > 1) {
                return "Expiring in $this->days_till_expiry days";
            } elseif ($this->days_till_expiry === 1) {
                return 'Expiring in 1 day';
            } else {
                return 'Expires today';
            }
        }

        if ($this->expiration_status === DocumentStatusEnum::Expired) {
            return "Expired $this->days_till_expiry days ago";
        } elseif ($this->expiration_status === DocumentStatusEnum::NotExpirable) {
            return DocumentStatusEnum::NotExpirable;
        }
        return DocumentStatusEnum::Active;
    }
}

<?php
class SupplierDocumentView extends Model {
    protected $appends = ['expiration_message'];
    protected $table = 'supplier_documents_view';

    public function owner() {
        return $this->belongsTo(User::class, 'owner_id');
    }

    public function facilities() {
        return $this->belongsToMany(Facility::class, 'supplier_document_facilities', 'supplier_document_id');
    }

    /**
     * Document expiration message.
     *
     * @return string
     */
    public function getExpirationMessageAttribute() {
        if ($this->expiration_status === DocumentStatusEnum::ExpiringSoon) {
            if ($this->days_till_expiry > 1) {
                return "Expiring in $this->days_till_expiry days";
            } elseif ($this->days_till_expiry === 1) {
                return 'Expiring in 1 day';
            } else {
                return 'Expires today';
            }
        }

        if ($this->expiration_status === DocumentStatusEnum::Expired) {
            return "Expired $this->days_till_expiry days ago";
        } elseif ($this->expiration_status === DocumentStatusEnum::NotExpirable) {
            return DocumentStatusEnum::NotExpirable;
        }
        return DocumentStatusEnum::Active;
    }
}

Answer 1

只需将其移至特征：

trait ExpirationAwareTrait
{
    public abstract function getExpirationStatusAttribute(): string;
    
    public function getExpirationMessageAttribute()
    {
        if ($this->expiration_status === DocumentStatusEnum::ExpiringSoon) {
            if ($this->days_till_expiry > 1) {
                return "Expiring in $this->days_till_expiry days";
            } elseif ($this->days_till_expiry === 1) {
                return 'Expiring in 1 day';
            } else {
                return 'Expires today';
            }
        }

        if ($this->expiration_status === DocumentStatusEnum::Expired) {
            return "Expired $this->days_till_expiry days ago";
        } elseif ($this->expiration_status === DocumentStatusEnum::NotExpirable) {
            return DocumentStatusEnum::NotExpirable;
        }

        return DocumentStatusEnum::Active;
    }
}

当您使用此特征时 - 您将必须实现getExpirationStatusAttribute方法。

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