laravel5.8 eloquent

https://learnku.com/docs/laravel/5.8/eloquent/3931

示例1：

$flights = AppFlight::all();

foreach ($flights as $flight) {
    echo $flight->name;
}

函数源码参考： vendorlaravelframeworksrcIlluminateDatabaseEloquentModel.php

示例2：　

$flights = AppFlight::where('active', 1) ->orderBy('name', 'desc') ->take(10) ->get();

https://learnku.com/docs/laravel/5.8/queries/3926
函数源码参考：
  vendorlaravelframeworksrcIlluminateDatabaseConcernsBuildsQueries.php
  vendorlaravelframeworksrcIlluminateDatabaseQueryBuilder.php

以上都是最基本的

eloquent 的优雅性，以后再写