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Filter the Laravel collection according to the birthday in model

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[开发(php) 所属分类 开发(php) | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

Okay, I'm pulling hair out with this one:

I'm using Laravel/Eloquent andphp. I have a Cadet model, which has a DATE field for date of birth called birthday .

In a controller, I'm retrieving a Collection of Cadet models that meet various criteria, but I'd like to filter the Collection based on the age of each Cadet too (i.e. the $output Collection should only have Cadet models above a minimum age.)

$activity->age_min is the minimum age (integer) I am wanting to filter the Collection by.

So, this is what I've been trying to do:

$output = $cadets->where('*, TIMESTAMPDIFF(YEAR, birthday, CURDATE()) AS age', '>', $activity->age_min);

Problem is, I'm getting an empty array as a result despite knowing that at least two Cadet records fulfill the criteria. If I add ->get(); to the end, the db falls over.

Can anyone point me in the right direction to get this to work so that $output contains a Collection of Cadet models with ages above $activity->age_min ?

UPDATE

Okay, well, I've tried btl's suggestions and can't get them to work as I need to work out the age of each cadet and compare it with an integer to decide whether to exclude them or not.

I've had a play with lesssugar's idea below and got this far:

// Work out a date for which people must be born after $max_date = \Carbon\Carbon::parse($activity->date_from)->subYears($activity->age_min); // Filter the collection $output = $cadets->filter(function ($cadet) { return $cadet->birthday > $max_date; });

... but I'm going round in circles trying to work out how to use the Filter function and get it to only return Cadets whose birth date is more recent than $max_date.

I think I've been at this for too long today so I'm stepping away for a while. Any help or suggestions (and especially answers!) would be gratefully received! :)

Okay, after some thought this is what I came up with:

// Work out a date for which people must be born BEFORE to be included $max_date = \Carbon\Carbon::parse($activity->date_from)->subYears($activity->age_min); // Filter the collection $cadets = $cadets->filter(function($cadet) use ($max_date) { if (\Carbon\Carbon::parse($cadet->birthday)->lte($max_date)) { return true; } } });

Thanks to @lesssugar for the filter() suggestion. Firstly using Carbon it's easy to create a date (minus the age limit) that is the threshold for determining if a cadet is old enough or not to be included in the collection ( $max_date ).

Then I run a filter on the existing collection and only pick out the records I'm interested in that have a birthday less than or equal to $max_date .

Originally I was thinking I could do this in a single query, but this is the solution I've arrived at and hopefully isn't too much more work.

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主题: LaravelPHPCUTI
tags: gt,date,age,max,activity,Carbon,filter,birthday
分页:12
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