Laravel4型号主键值插入后丢失 [英] Laravel4 Model primary key value is lost after insert

问题描述

<?php
// Model
class ProfileDelivery extends \Eloquent {
    protected $table = 'profile_delivery';
    protected $guarded = array();
    public $timestamps = FALSE;
}

// Somewhere
$deliveryGuy->id = 1;
print $deliveryGuy->id; // Prints 1
if (!$deliveryGuy->save()) {
    throw new \Exception('Cant save .');
}
print $deliveryGuy->id; // Prints 0

任何人都可以解释为什么ID值丢失？

Can anyone explain me why the ID value is lost?

推荐答案

这是因为您的数据库中的id列可能没有自动增量设置。

This is because your id column in the database probably does not have autoincrement set.

我尝试了一个没有自动增量的测试模型，它返回0，但是当我将id列更改为自动增量时，它正确地返回了该id。

I tried this with a test model without autoincrement and it returns 0, but when I changed the id column to autoincrement it returned the id correctly.

检查此功能在laravel /框架/ Src /照明/数据库/口述/ Model.php

Check this function in laravel/Framework/Src/Illuminate/Database/Eloquent/Model.php

它表示将插入并设置id，如果它具有自动增量。

It says it will insert and set id if it has autoincrement.

protected function performInsert($query)
    {
        if ($this->fireModelEvent('creating') === false) return false;

        // First we'll need to create a fresh query instance and touch the creation and
        // update timestamps on this model, which are maintained by us for developer
        // convenience. After, we will just continue saving these model instances.
        if ($this->timestamps)
        {
            $this->updateTimestamps();
        }

        // If the model has an incrementing key, we can use the "insertGetId" method on
        // the query builder, which will give us back the final inserted ID for this
        // table from the database. Not all tables have to be incrementing though.
        $attributes = $this->attributes;

        if ($this->incrementing)
        {
            $this->insertAndSetId($query, $attributes);
        }

        // If the table is not incrementing we'll simply insert this attributes as they
        // are, as this attributes arrays must contain an "id" column already placed
        // there by the developer as the manually determined key for these models.
        else
        {
            $query->insert($attributes);
        }

        // We will go ahead and set the exists property to true, so that it is set when
        // the created event is fired, just in case the developer tries to update it
        // during the event. This will allow them to do so and run an update here.
        $this->exists = true;

        $this->fireModelEvent('created', false);

        return true;
    }

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