我可以将过滤器添加到过滤月份的日期吗？
我知道我可以使用过滤器<％loop $ Courses.Filter（'DateTo'，' - 12 -05-2017'）％>，但这是特定日期的过滤器。我想做的是按月过滤，即<％loop $ Courses.Filter（'DateTo.Month'，'February'）％>？
这可能吗？
韦斯利
对于更高级的过滤，我通常在模型上创建一个处理过滤的函数
/**
* Courses that take place in given month.
*
* @param int $month
* @return DataList
*/
public function CoursesByMonth($month)
{
$year = date('Y');
$day = date('d');
$endDay = cal_days_in_month(CAL_GREGORIAN, $month, $year);
return $this->Courses()->filter(
[
'DateTo:GreaterThan' => $year . '-' . $month . '-' . $day . ' 00:00:00',
'DateTo:LessThan' => $year . '-' . $month . '-' . $endDay . ' 23:59:59',
]
);
}
然后你可以在你的模板中使用它
<% loop $CoursesByMonth(2) %>
我实际上没有测试过这个函数本身，所以很可能它不起作用，但希望这能让你了解如何实现你想要做的事情。
不知何故，我没有得到这个工作。我认为这与我目前的设置有关。我来谈谈你的一些背景知识。
所以我有3个php文件位于mysite / code（下面的文件）中。这些文件允许您创建具有不同课程日期的课程。这些课程应按月分组并显示在主页（HomePage.ss）上，但不知怎的，我无法完成这些课程。所以目前我已经为html添加了一些过滤器，这部分工作。因此显示月份，但课程不按月分组，而是按照他们的coursename分组。在这个问题的底部，您将看到我的解决方法。
我错过了什么或做错了什么？
1. Courses.php
<?php
class Course extends DataObject {
private static $db = array(
'DateTo' => 'Date',
'DateFrom' => 'Date',
);
private static $has_one = array(
'Project' => 'Project'
);
}
2. Project.php
<?php
class Project extends Page {
private static $has_many = array(
'Courses' => 'Course'
);
private static $db = array(
'courses_Check' => 'Boolean(1)',
'courses_Title' => 'Text',
'courses_Description' => 'HTMLText',
'courses_TargetAudience' => 'Text',
'courses_Goal' => 'Text',
'courses_Length' => 'Int',
'courses_Costs' => 'Currency',
'courses_Content' => 'HTMLText',
'courses_Learnings' => 'HTMLText',
'courses_Accreditation' => 'HTMLText',
'courses_Location' => 'HTMLText',
'courses_AdditionalInfo' => 'HTMLText',
);
public function getCMSFields() {
// Get the fields from the parent implementation
$fields = parent::getCMSFields();
$fields->addFieldToTab('Root.Main', new TextField('courses_Title','Cursustitel'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_Description','Cursus beschrijving'),'Content');
$fields->addFieldToTab('Root.Main', new TextField('courses_TargetAudience','Doelgroep'),'Content');
$fields->addFieldToTab('Root.Main', new TextField('courses_Goal','Doel'),'Content');
$fields->addFieldToTab('Root.Main', new NumericField('courses_Length','Cursusduur aantal dagen'),'Content');
$fields->addFieldToTab('Root.Main', new CurrencyField('courses_Costs','Kosten van de cursus'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_Content','Inhoud Cursus'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_Learnings','Leerdoelen'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_Accreditation','Accreditatie'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_Location','Cursuslocatie'),'Content');
$fields->addFieldToTab('Root.Main', new HTMLEditorField('courses_AdditionalInfo','Meer informatie'),'Content');
// Create a default configuration for the new GridField, allowing record editing
$config = GridFieldConfig_RelationEditor::create();
// Set the names and data for our gridfield columns
$config->getComponentByType('GridFieldDataColumns')->setDisplayFields(array(
'DateTo' => 'Datum van',
'DateFrom' => 'Datum tot',
'Project.Title'=> 'Cursusnaam' // Retrieve from a has-one relationship
));
// Create a gridfield to hold the course relationship
$studentsField = new GridField(
'Cursus Data', // Field name
'Cursus', // Field title
$this->Courses(), // List of all related students
$config
);
// Create a tab named "Courses" and add our field to it
$fields->addFieldToTab('Root.Cursus data', $studentsField);
// Remove Content Field
$fields->removeFieldFromTab("Root.Main","Content");
$fields->removeFieldFromTab("Root.Main","Metadata");
return $fields;
}
3. ProjectHolder.php
<?php
class ProjectHolder extends Page {
private static $allowed_children = array(
'Project'
);
}
class ProjectHolder_Controller extends Page_Controller {
}
我的解决方法
<div class="half">
<% loop $Projects %>
<% loop $Courses.Limit(1) %>
<div class="tab">
<% if DateTo.Month == "January" %>
<input id="tab-one" type="checkbox" name="tabs">
<label for="tab-one">January</label>
<% else_if DateTo.Month == "February" %>
<input id="tab-two" type="checkbox" name="tabs">
<label for="tab-two">February</label>
<% else_if DateTo.Month == "March" %>
<input id="tab-three" type="checkbox" name="tabs">
<label for="tab-three">March</label>
<% else_if DateTo.Month == "April" %>
<input id="tab-four" type="checkbox" name="tabs">
<label for="tab-four">April</label>
<% else_if DateTo.Month == "May" %>
<input id="tab-five" type="checkbox" name="tabs">
<label for="tab-five">May</label>
<% else_if DateTo.Month == "June" %>
<input id="tab-six" type="checkbox" name="tabs">
<label for="tab-six">June</label>
<% else_if DateTo.Month == "July" %>
<input id="tab-seven" type="checkbox" name="tabs">
<label for="tab-seven">July</label>
<% else_if DateTo.Month == "August" %>
<input id="tab-eight" type="checkbox" name="tabs">
<label for="tab-eight">August</label>
<% else_if DateTo.Month == "September" %>
<input id="tab-nine" type="checkbox" name="tabs">
<label for="tab-nine">September</label>
<% else_if DateTo.Month == "October" %>
<input id="tab-ten" type="checkbox" name="tabs">
<label for="tab-ten">October</label>
<% else_if DateTo.Month == "November" %>
<input id="tab-eleven" type="checkbox" name="tabs">
<label for="tab-eleven">November</label>
<% else_if DateTo.Month == "December" %>
<input id="tab-twelve" type="checkbox" name="tabs">
<label for="tab-twelve">December</label>
<% end_if %>
<% end_loop %>
<div class="tab-content">
<ul style="line-height:1.8em; margin:10px 0;">
<% loop $Courses.Sort(DateTo, ASC) %>
<li><a href="$URLSegment.Up">$DateTo.DayOfMonth $DateTo.Month $DateTo.ShortMonth - $DateFrom.DayOfMonth $DateFrom.ShortMonth: $Project.Title</a></li>
<% end_loop %>
</ul>
</div>
</div>
<% end_loop %>
</div>
模板中有太多的业务逻辑 - 您需要简化。我不太了解上面的代码，$ Projects循环来自哪里，但我的方法将如下所示，在PHP端移动尽可能多的逻辑。所以将以下内容添加到Project类：
public function CoursesByMonth() {
$months = array();
foreach ($this->Courses() as $course) {
$month = $course->DateTo->Month();
if (!in_array($month, months)) {
$months[] = $month
}
}
// at this point you have all the distinct months, but the array it's not sorted by month, so let's sort it
$months_sorted = array();
foreach($months as $month) {
$m = date_parse($month);
$months_sorted[$m['month']] = $month;
}
ksort($months_sorted);
// at this point you have a simple PHP array, with all the distinct months from all the courses, in the proper order
// but this is useless in Silverstripe templates - so we need to do some other stuff here
$result = new ArrayList();
foreach ($months_sorted as $month) {
$courses_for_current_month = $this->Courses()->filter('DateTo.Month' => $month);
$result->push(new ArrayData(
'Month' => $month,
'Courses' => $courses_for_current_month;
));
}
return $result;
}
...然后在模板中有这样的东西：
<div class="half">
<% loop $Projects %>
<% loop $CoursesByMonth %>
<div class="tab">
<input id="tab-{$Pos(1)}" type="checkbox" name="tabs">
<label for="tab-{$Pos(1)}">$Month</label>
<% end_loop %>
<div class="tab-content">
<ul style="line-height:1.8em; margin:10px 0;">
<% loop $CoursesByMonth.Courses.Sort('DateTo', 'ASC') %>
<li><a href="$URLSegment.Up">$DateTo.DayOfMonth $DateTo.Month $DateTo.ShortMonth - $DateFrom.DayOfMonth $DateFrom.ShortMonth: $Project.Title</a></li>
<% end_loop %>
</ul>
</div> <!--/ .tab-content -->
</div> <!--/ .tab -->
<% end_loop %>
</div> <!--/ .half -->
我没有测试过所有这些，但据我所知，这是我能想到的代码。即使它不起作用，它也会给你一些我非常肯定的想法。