Propel - 使用多个外键连接同一个表答案

【问题标题】：Propel - Joining the same table using multiple foreign keysPropel - 使用多个外键连接同一个表
【发布时间】：2016-01-07 04:57:53
【问题描述】：

我遇到了 Propel2（版本 2.0.0-dev）的问题。

我有三个外键指向同一个表：

<foreign-key foreignTable="sites" phpName="Site" refPhpName="Timesheet">
  <reference local="siteID" foreign="siteID"/>
</foreign-key>
<foreign-key foreignTable="sites" phpName="FromSite">
  <reference local="from_siteID" foreign="siteID"/>
</foreign-key>
<foreign-key foreignTable="sites" phpName="ToSite">
  <reference local="to_siteID" foreign="siteID"/>
</foreign-key>

尽管有不同的 PhpNames，但基类会错误地生成 default: $key：

if (null !== $this->aToSite) {
        switch ($keyType) {
            case TableMap::TYPE_CAMELNAME:
                $key = 'site';
                break;
            case TableMap::TYPE_FIELDNAME:
                $key = 'sites';
                break;
            default:
                $key = 'Site';
        }
        $result[$key] = $this->aToSite->toArray($keyType, $includeLazyLoadColumns,  $alreadyDumpedObjects, true);
    }

default: $key 应该是 ToSite，而不是 Site。 FromSite 也是如此。结果，Site 表只为Site 加入，但不为FromSite 和ToSite 加入，这随后不允许我使用FromSite 和ToSite 调用对象。

表格按以下方式连接：

$timesheets = TimesheetQuery::create()
  ->select(Timesheet::getTransferFieldsWithRelations())
  ...
  ->joinWith("Timesheet.FromSite FromSite", Criteria::LEFT_JOIN)
  ->joinWith("Timesheet.ToSite ToSite", Criteria::LEFT_JOIN)
  ->joinWith("Timesheet.Site Site", Criteria::LEFT_JOIN)
  ...

有没有办法解决这个问题？

【问题讨论】：

标签： php mysql orm schema propel

【解决方案1】：

我们设法解决了上述问题。在Propel/Generator/Builder/Om/ObjectBuilder.php 中，更改以下内容：

if (\$includeForeignObjects) {";
        foreach ($fks as $fk) {
            $script .= "
        if (null !== \$this->" . $this->getFKVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getForeignTable(), false)}
            \$result[\$key] = \$this->" . $this->getFKVarName($fk) . "->toArray(\$keyType, \$includeLazyLoadColumns,  \$alreadyDumpedObjects, true);
        }";
        }
        foreach ($referrers as $fk) {
            if ($fk->isLocalPrimaryKey()) {
                $script .= "
        if (null !== \$this->" . $this->getPKRefFKVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getTable(), false)}
            \$result[\$key] = \$this->" . $this->getPKRefFKVarName($fk) . "->toArray(\$keyType, \$includeLazyLoadColumns, \$alreadyDumpedObjects, true);
        }";
            } else {
                $script .= "
        if (null !== \$this->" . $this->getRefFKCollVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getTable(), true)}
            \$result[\$key] = \$this->" . $this->getRefFKCollVarName($fk) . "->toArray(null, false, \$keyType, \$includeLazyLoadColumns, \$alreadyDumpedObjects);
        }";
            }
        }
        $script .= "
    }";

到

if (\$includeForeignObjects) {";
        foreach ($fks as $fk) {
            $script .= "
        if (null !== \$this->" . $this->getFKVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getPhpName(), $fk->getForeignTable(), false)}
            \$result[\$key] = \$this->" . $this->getFKVarName($fk) . "->toArray(\$keyType, \$includeLazyLoadColumns,  \$alreadyDumpedObjects, true);
        }";
        }
        foreach ($referrers as $fk) {
            if ($fk->isLocalPrimaryKey()) {
                $script .= "
        if (null !== \$this->" . $this->getPKRefFKVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getRefPhpName(), $fk->getTable(), false)}
            \$result[\$key] = \$this->" . $this->getPKRefFKVarName($fk) . "->toArray(\$keyType, \$includeLazyLoadColumns, \$alreadyDumpedObjects, true);
        }";
            } else {
                $script .= "
        if (null !== \$this->" . $this->getRefFKCollVarName($fk) . ") {
            {$this->addToArrayKeyLookUp($fk->getRefPhpName(), $fk->getTable(), true)}
            \$result[\$key] = \$this->" . $this->getRefFKCollVarName($fk) . "->toArray(null, false, \$keyType, \$includeLazyLoadColumns, \$alreadyDumpedObjects);
        }";
            }
        }
        $script .= "
    }";

还有这个：

protected function addToArrayKeyLookUp(Table $table, $plural)
{
    $phpName = $table->getPhpName();
    $camelCaseName = $table->getCamelCaseName();
    $fieldName = $table->getName();

到：

protected function addToArrayKeyLookUp($phpName, Table $table, $plural)
{
    if($phpName == "") {
        $phpName = $table->getPhpName();  
    }

    $camelCaseName = $table->getCamelCaseName();
    $fieldName = $table->getName();

现在我可以毫无问题地将多个带有 PHPNames 的 FK 引用到同一个表中。

请注意，每次更新 Propel 时文件都会更改。

【讨论】：