Laravel-Training-Project/app/Http/Controllers/DataTablesController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\DB;
use Illuminate\Http\Request;
use Yajra\DataTables\Facades\DataTables;
class DataTablesController extends Controller
{



    public function dynamicDataTable($datatableName, Request $request)
    {
        // Fetch the DataTable configuration
        $datatableConfig = DB::table('datatables')->where('name', $datatableName)->first();

        if (!$datatableConfig) {
            return response()->json(['error' => 'DataTable configuration not found'], 404);
        }


        // Determine the type of response (default to 'data')
        $type = $request->get('type', 'data');


        // Start building the query
        $query = DB::table($datatableConfig->base_table);


        // Apply columns
        $select_columns = json_decode($datatableConfig->select_columns, true);
        foreach ($select_columns as $column) {
            $query->selectRaw($column['select_exp']);
        }

        // Apply joins
        $joins = json_decode($datatableConfig->joins, true);
        if (!empty($joins)) {
            foreach ($joins as $join) {
                if (str_contains($join['table'], '(')) { // Detect subquery joins
                    $query->join(DB::raw($join['table']), $join['on']['first'], $join['on']['operator'], $join['on']['second'], $join['type']);
                } else {
                    $query->join($join['table'], $join['on']['first'], $join['on']['operator'], $join['on']['second'], $join['type']);
                }

            }
        }

        // Apply conditions (filters)
        $conditions = json_decode($datatableConfig->conditions, true);
        if (!empty($conditions)) {
            foreach ($conditions as $condition) {
                if (isset($condition['raw'])) {
                    $query->whereRaw($condition['raw']);
                } else {
                    $query->where($condition['column'], $condition['operator'], $condition['value']);
                }

            }
        }

        // Apply sorting
        $sorting = $request->order[0] ?? json_decode($datatableConfig->default_sorting, true)[0];

        $query->orderBy($sorting['name'], $sorting['dir']);

        // Pass query to DataTables
        return DataTables::of($query)->make(true);


    }

}