[英]Laravel 8 nested Model Relationships
This is my first ever Laravel project, please bear with us.这是我的第一个 Laravel 项目,请多多包涵。 I am trying to display a parent->child hierarchy (not recursive), something akin to below:我正在尝试显示父->子层次结构(非递归),类似于以下内容:
I can't get my head around how to write the query to get the resources linked to the subStatement, not the top category, basically, an inner join related to SubStatement.我无法理解如何编写查询以获取链接到子语句的资源,而不是顶级类别,基本上是与子语句相关的内部连接。 It is currently displayed as so;目前是这样显示的;
{
"id": 1,
"name": "Category 1: Practising plumbing overview",
"description": "<p>Category 1: Practising plumbing overview</p>",
"created_at": "2022-01-06 15:48:49",
"updated_at": "2022-01-06 15:48:49",
"deleted_at": null,
"plumbing_area_id": 1,
"category_id": 1,
"SubStatement": [
{
"id": 1,
"title": "Plying narrative for Category 1",
"description": "<p>Body of content.</p>",
"theme_id": 1,
"plumbing_area_id": 1
},
{
"id": 2,
"title": "Lay narrative for Category 1",
"description": "<p>body description.</p>",
"theme_id": 1,
"plumbing_area_id": 1
}
],
"resources": []
},
{
"id": 2,
"name": "Category 2: AAV Practising plumbing introduction",
"description": "<p><strong>Category 2:</strong> AAV Practising plumbing introduction</p>",
"created_at": "2022-01-06 15:49:12",
"updated_at": "2022-01-06 15:49:12",
"deleted_at": null,
"plumbing_area_id": 1,
"category_id": 1,
"SubStatement": [
{
"id": 3,
"title": "Plying narrative for Category 2",
"description": "<p>Body of content;</p>",
"theme_id": 2,
"plumbing_area_id": 1
},
{
"id": 4,
"title": "Lay narrative for Category 2",
"description": "<p>Body of content</p>",
"theme_id": 2,
"plumbing_area_id": 1
}
],
"resources": []
},
{
"id": 3,
"name": "Category 3: AAV Practising plumbing design",
"description": "<p><strong>Category 3: </strong>AAV Practising plumbing design</p>",
"created_at": "2022-01-06 15:49:47",
"updated_at": "2022-01-06 15:49:47",
"deleted_at": null,
"plumbing_area_id": 1,
"category_id": 1,
"SubStatement": [
{
"id": 5,
"title": "Plying narrative for Category 3",
"description": "<p>Body of content;</p>",
"theme_id": 3,
"plumbing_area_id": 1
},
{
"id": 6,
"title": "Lay narrative for Category 3",
"description": “Blah blah</p>",
"theme_id": 3,
"plumbing_area_id": 1
}
],
"resources": []
},
{
"id": 4,
"name": "Category 4: another “category,
"description": “Body</p>",
"created_at": "2022-01-06 15:50:04",
"updated_at": "2022-01-06 15:50:04",
"deleted_at": null,
"plumbing_area_id": 1,
"category_id": 1,
"SubStatement": [
{
"id": 7,
"title": "Plying narrative for Category 4",
"description": "<p>sdfsdfsdf;</p>",
"theme_id": 4,
"plumbing_area_id": 1
},
{
"id": 8,
"title": "Lay narrative for Category 4",
"description": "<p> sdfsdfsdfsdf</p>",
"theme_id": 4,
"plumbing_area_id": 1
}
],
"resources": []
},
]
I am looking for something like below instead, please note where the resource node is:我正在寻找类似下面的东西,请注意资源节点的位置:
[
{
"id": 1,
"name": "Category 1: Practising plumbing overview",
"description": "<p>Category 1: Practising plumbing overview</p>",
"created_at": "2022-01-06 15:48:49",
"updated_at": "2022-01-06 15:48:49",
"deleted_at": null,
"plumbing_area_id": 1,
"category_id": 1,
"SubStatement": [
{
"id": 1,
"title": "Plying narrative for Category 1",
"description": "<p>Body of content.</p>",
"theme_id": 1,
"plumbing_area_id": 1,
"resources": [
{
"id": 1,
"resource_title": "The name of the resource"
}
]
}
]
}
]
//Themes Model //主题 Model
{
return $this->hasMany(Statement::class, 'theme_id', 'id');
}
public function resources()
{
return $this->belongsToMany(Resource::class);
}
//the Controller below is outputting the the JSON above //下面的Controller正在输出上面的JSON
{
$output = Theme::where ( 'category_id', '=', $category_id )
->with(['subStatement' =>
fn ($query) =>
$query->select('id','title','description','theme_id','therapy_area_id')
])
->with(['resources' =>
fn ($query) =>
$query->select('id','temporary_url')])
->get();
}
// I attempted writing something like this. // 我试图写这样的东西。 It threw a " Integrity constraint violation: 1052 Column 'id' in field list is ambiguous " error它引发了“完整性约束违规:字段列表中的 1052 列 'id' 不明确”错误
{
return $this->hasOneThrough(Statement::class, Resource::class);
}
Your main issue is that you need to nest the query.您的主要问题是您需要嵌套查询。
I will first adding the relationships to your models according to your schema.我将首先根据您的模式将关系添加到您的模型中。
Then, I will add the base query for the nesting if I understood what you're trying to achieve correctly.然后,如果我了解您要正确实现的目标,我将为嵌套添加基本查询。
Theme.php主题.php
public function subStatements()
{
return $this->hasMany(Statement::class); // 1-N
}
public function statements()
{
return $this->belongsToMany(Statement::class); // N-N
}
public function resources
{
return $this->belongsToMany(Resource::class); // N-N
}
Statement.php声明.php
public function theme()
{
return $this->belongsTo(Theme::class); // 1-N
}
public function themes()
{
return $this->belongsToMany(Theme::class); // N-N
}
public function resources
{
return $this->belongsToMany(Resource::class); // N-N
}
Resource.php资源.php
public function themes()
{
return $this->belongsToMany(Theme::class); // N-N
}
public function statements()
{
return $this->belongsToMany(Statement::class); // N-N
}
$themes = Theme::query()
->where('category_id', $category_id)
->with([
'subStatements' => fn ($query) => $query->with('resources')
])
->get();
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