我有3个相关的表格如下: - > AgeGroups - >队。
我能够获得部分列表并列出每个部分中的所有年龄组和团队。目前,无论年龄组中是否存在任何团队,都会列出所有章节和年龄组。
我希望为此查询添加约束,以便我只获得包含其中包含团队的年龄组的部分列表。例如
表格列是:
sections: id | name
agegroups: id | name | section_id
teams: id | name | agegroup_id
模型定义如下:
class Section extends Eloquent{
public function agegroup()
{
return $this->hasMany('agegroup');
}
}
class Agegroup extends Eloquent{
public function section()
{
return $this->belongsTo('section');
}
public function team()
{
return $this->hasMany('team');
}
}
class Team extends Eloquent {
public function agegroup()
{
return $this->belongsTo('agegroup');
}
}
(出于测试目的)我的PHP代码包括用于预先加载的嵌套关系,位于下面的路由闭包中:
Route::get('/', function()
{
$sections = Section::with('agegroup.team')->get();
foreach ($sections as $section) {
echo "<h2>$section->name </h2><ul>";
foreach ($section->agegroup as $agegroup) {
echo "<li>$agegroup->name </li><ul>";
foreach ($agegroup->team as $team) {
echo "<li> $team->name </li>";
}
echo "</ul>";
}
echo "</ul>";
}
});
在测试中,我已经能够为简单关系添加约束,但我对如何为嵌套关系执行此操作感到茫然。
我希望我已经正确解释了这一点,感谢您抽出时间阅读本文以及提供的任何帮助。
======更新======
在下面的帮助之后,我有以下代码,它似乎与建议的解决方案相同,禁止在模型中添加return语句以返回函数值:
这几乎就在那里 - 返回部分(用dd($ ...)检查)但是我得到错误:未定义属性:Illuminate \ Database \ Eloquent \ Collection :: $ teams
行$ teams = $ this - &gt;年龄组 - &gt; Section模型agegroupsWithTeams()方法中的团队。
任何想法?! (感谢)
// controller/view code
Route::get('/', function()
{
$sections = Section::allWithAgeGroupsWithTeams();
foreach ($sections as $section)
{
echo $section->name
foreach ($section->agegroupsWithTeams() as $agegroup)
{
echo $agegroup->name;
foreach ($agegroup->teams as $team)
{
echo $team->name;
}
}
}
});
// model code
class Section extends Eloquent
{
public function agegroups()
{
return $this->hasMany('agegroup');
}
static function allWithAgeGroupsWithTeams()
{
$teams = Team::all();
$agegroups = Agegroup::whereIn('id', $teams->lists('agegroup_id'))->get();
$sections = Section::whereIn('id', $agegroups->lists('section_id'))->get();
return $sections;
}
public function agegroupsWithTeams()
{
$teams = $this->agegroups;
return Agegroup::whereIn('id', $teams->lists('agegroup_id'))->get();
}
}
class Agegroup extends Eloquent
{
public function section()
{
return $this->belongsTo('section');
}
public function teams()
{
return $this->hasMany('team');
}
}
class Team extends Eloquent
{
public function agegroups()
{
return $this->belongsTo('agegroup');
}
}
答案 0 :(得分:2)
我认为你这一切都错了。你所拥有的大部分内容都是正确的,但尝试一些更清洁的东西。在Section.php里面
class Section
...
public function nestedgroups()
{
return $this->hasMany('Agegroup')->has('teams');
}
然后您可以使用
简单地获取所有嵌套数据$sections = Section::has('nestedgroups')->with('agegroups.teams')->get();
这适用于4.1和4.0。如果您使用4.1和sqlite进行测试,请确保以has()方式转义查询:
...::has('nestedgroups', '>', DB::raw(0))->...
答案 1 :(得分:0)
将agegroup()更改为agegroups()和team()更新为teams(),然后尝试这样的事情(代码未测试):
<?php
// model classes
class Section extends Eloquent {
static function allWithAgeGroupsWithTeams()
{
$teams = Team::all();
$agegroups = Agegroup::whereIn('id', $teams->lists('agegroup_id'))->get();
$sections = Section::whereIn('id', $agegroups->lists('section_id'))->get();
}
public function agegroupsWithTeams()
{
$teams = $this->agegroups->teams;
return Agegroup::whereIn('id', $teams->lists('agegroup_id'))->get();
}
}
?>
<?php
// controller/view code
$sections = Section::allWithAgeGroupsWithTeams();
foreach ($sections as $section)
{
echo $section->name;
foreach ($section->agegroupsWithTeams() as $agegroup)
{
echo $agegroup->name;
foreach ($agegroup->teams as $team)
{
echo $team->name;
}
}
}
?>
http://laravel.com/api/class-Illuminate.Support.Collection.html#_lists http://laravel.com/docs/queries