我是Laravel的新手。我从github代码修改了启动应用程序，将给定的帖子详细信息保存到数据库中。 但面临2个以下问题
我为多对多关系设置了一个数据库。
帖子，类别和类别_post
创建了一个表单来添加/编辑帖子
<form class="form-horizontal" method="post" action="@if (isset($post)){{ URL::to('admin/blogs/' . $post->id . '/edit') }}@endif" autocomplete="off">
<!-- CSRF Token -->
<input type="hidden" name="_token" value="{{{ csrf_token() }}}" />
<!-- ./ csrf token -->
<!-- Tabs Content -->
<div class="tab-content">
<!-- General tab -->
<div class="tab-pane active" id="tab-general">
<!-- Post Title -->
<div class="form-group {{{ $errors->has('title') ? 'error' : '' }}}">
<div class="col-md-12">
<label class="control-label" for="title">Post Title</label>
<input class="form-control" type="text" name="title" id="title" value="{{{ Input::old('title', isset($post) ? $post->title : null) }}}" />
{{{ $errors->first('title', '<span class="help-block">:message</span>') }}}
</div>
</div>
<div class="form-group {{{ $errors->has('categories') ? 'error' : '' }}}">
<div class="col-md-12">
<label class="control-label" for="categories">Categories</label>
<input class="form-control" type="text" name="categories" id="categories" value="{{{ Input::old('categories', isset($post) ? $post->categories : null) }}}" />
{{{ $errors->first('categories', '<span class="help-block">:message</span>') }}}
</div>
</div>
<!-- ./ post title -->
<!-- Content -->
<div class="form-group {{{ $errors->has('content') ? 'has-error' : '' }}}">
<div class="col-md-12">
<label class="control-label" for="content">Content</label>
<textarea class="ckeditor" name="content" value="content" rows="10">{{{ Input::old('content', isset($post) ? $post->content : null) }}}</textarea>
{{{ $errors->first('content', '<span class="help-block">:message</span>') }}}
</div>
</div>
<!-- ./ content -->
</div>
<!-- ./ general tab -->
</div>
<!-- ./ tabs content -->
<!-- Form Actions -->
<div class="form-group">
<div class="col-md-12">
<element class="btn-cancel close_popup">Cancel</element>
<button type="reset" class="btn btn-default">Reset</button>
<button type="submit" class="btn btn-success">Update</button>
</div>
</div>
<!-- ./ form actions -->
</form>
这是控制器代码
// Start transaction!
DB::beginTransaction();
$title = Input::get('title');
$categoriesString = Input::get('categories');
$categories = explode(',', $categoriesString);
$postDetails = $this->post->findByTitle($title);
if($postDetails)
{
return Redirect::to('blog/create')->withInput()->withErrors(array('title' => 'Title already exists'));
} else {
// Update the blog post data
$this->post->title = $title;
$this->post->slug = Str::slug(Input::get('title'));
$this->post->content = Input::get('content');
}
try
{ // Validate, then create if valid
$newPost = $this->post->save();
} catch(ValidationException $e)
{
// Rollback and then redirect
// back to form with errors
DB::rollback();
return Redirect::to('admin/blogs/create')->with('error', Lang::get('admin/blogs/messages.create.error'));
} catch(\Exception $e)
{
DB::rollback();
throw $e;
}
将类别作为逗号分隔自表单
$categoriesString = Input::get('categories');
$categories = explode(',', $categoriesString);
然后检查数据库中已存在的类别。如果存在获取它的id并附加到新数组。
$categoryClass = new Categories();
$categoryIds = array();
foreach($categories as $category)
{
try {
// Validate, then create if valid
$categoryName = strtolower($category);
$categoryDetails = $categoryClass->findByName($categoryName);
if($categoryDetails)
{
$categoryId = $categoryDetails->id;
} else {
$categoryClass->name = $category;
$categoryClass->save();
$categoryId = $categoryClass->id;
}
} catch(ValidationException $e)
{
// Rollback and then redirect
// back to form with errors
DB::rollback();
return Redirect::to('blog/create')->with('error', Lang::get('blog/messages.create.error'));
} catch(\Exception $e)
{
DB::rollback();
throw $e;
}
// Push category id into category id's array
$categoryIds[] = $categoryId;
}
//Then sync the categories with new categories
$this->post->categories()->sync($categoryIds);
// Commit
DB::commit();
return Redirect::to('blog/' . $this->post->id . '/edit')->with('success', Lang::get('blog/messages.create.success'));
POST模型
/**
* Get the post's categories.
*
* @return array
*/
public function categories()
{
return $this->belongsToMany('Categories');
}
分类模型
/**
* Get the Categories's posts.
*
* @return array
*/
public function posts()
{
return $this->belongsToMany('Post');
}
有人请帮助我解决这个问题。
答案 0 :(得分：3)
这样做的日子要容易得多。这是我如何存储我的文章，标签可以用逗号分隔。
文章控制器存储功能：首先创建文章对象，将user_id设置为当前用户会话ID并填写表单中的所有字段。如果文章在标签模型中使用静态方法保存了附加标签。
public function store()
{
$article = new Article();
$article->user_id = Auth::id();
$article->fill(Input::all());
if ($article->save())
{
Tag::attach($article, Input::get('tags'));
return Redirect::route('articles.index')
->with(['flashMessage' => 'Article created.', 'flashType' => 'success']);
} else {
return Redirect::back()->withErrors($article->errors())->withInput();
}
}
文章模型，设置可填充属性和标记关系：
protected $fillable = ['category_id', 'title', 'description', 'content', 'published'];
public function tags()
{
return $this->belongsToMany('Tag', 'article_tag', 'article_id', 'tag_id');
}
标签模型文章关系：
public function articles()
{
return $this->belongsToMany('Article', 'article_tag', 'tag_id', 'article_id');
}
标记模型附加shope：首先创建空数组以保存标记，爆炸逗号分隔标记并枚举它们。修剪爆炸标签以消除空白区域。从标记表中获取TagID，如果为空（意味着标记不存在），则创建它。将每个TagID添加到tags数组，最后将文章模型与tags数组同步。
public function scopeAttach($query, $model, $tags)
{
$returnTags = array();
foreach (explode(',', $tags) as $tag)
{
$tag = trim(Str::slug($tag));
if ($tag != '')
{
$tagID = Tag::where('name', '=', $tag)->pluck('id');
if (empty($tagID))
{
$tagNew = new Tag;
$tagNew->name = $tag;
$tagNew->save();
$tagID = $tagNew->id;
}
$returnTags[] = $tagID;
}
}
$model->tags()->sync($returnTags);
}
View presenter implode tags功能：枚举所有代码并内嵌到逗号分隔的字符串。
public function implodeTags()
{
$returnString = null;
foreach ($this->tags as $tag)
{
if (!empty($returnString)) $returnString .= ", ";
$returnString .= $tag->name;
}
return $returnString;
}
创建/编辑刀片视图：首先打开新表单以创建或绑定模型以进行编辑。如果创造;显示没有值的输入字段。如果编辑;使用视图展示器中的implodeTags函数，用逗号分隔的标记列表填充文本字段。
@if (!isset($edit))
@section('title', 'Create article')
{{ Form::open(array('route' => 'articles.store', 'role' => 'form')) }}
@else
@section('title', 'Edit article')
{{ Form::model($article, array('method' => 'PUT', 'route' => ['articles.update', $article->id], 'role' => 'form')) }}
@endif
...
<div class="form-group @if ($errors->has('tags')) has-error @endif">
{{ Form::label('tags', 'Tags') }}
@if(!isset($article))
{{ Form::text('tags', null, array('class' => 'form-control')) }}
@else
{{ Form::text('tags', $article->present()->implodeTags, array('class' => 'form-control')) }}
@endif
@if ($errors->has('tags')) <p class="help-block">{{ $errors->first('tags') }}</p> @endif
</div>
...
显然，创建/编辑视图包含的内容多于此，但这些是与标记实现相关的部分。