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[英]Join query that gets members of a group, and then gets groups as query in Laravel
[英]Laravel get all groups along with the count of each groups group members using join query
我有两个表'Group'('id','title','description')和'Group_members'('id','group_id','user_id')。 每当用户加入组时,都会在“ group_members”表中创建一行。
我需要获取所有组以及每个组中的成员数,例如:
[
{
id: 1
title: group1
description: lorem ipsum
member_count: 5
}{
id: 2
title: group2
description: lorem ipsum
member_count: 7
}
]
到目前为止,我所做的是
DB::table('group')
->join('group_members',
function($join){
$join->on('group_members.group_id', '=', 'group.id')
->distinct()->pluck('group_members.user_id')->count();
})
->get();
返回错误
SQLSTATE [42000]:语法错误或访问冲突:1064 SQL语法有错误; 检查与您的MySQL服务器版本相对应的手册,以获取正确的语法以在“附近” group
。 id
= group_members
.`group_id
请帮忙
如果您在小组模型中建立了关系,例如
public function group_members()
{
return $this->hasMany('App\GroupMember');
}
在GroupMember模型中
public function group()
{
return $this->belongsTo('App\Group');
}
你应该能够做
$groups = Group::all();
foreach ($groups as $group) {
$group->member_count = $group->group_members()->count();
}
$groupsArray = $groups->toArray();
要么
$group = Group::where('column', 'value')->with('group_members')->first();
$count = $group->group_members->count();
您还可以使用mutatus / accessor作为模型的属性返回成员数,因此在您的组模型中
getGroupMemberCountAttribute() {
return $this->group_members()->count();
}
并像这样使用
$group->group_member_count;
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