class Post extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'posts';
    protected $softDelete = true;

    ...

...->whereNull('deleted_at')->get();

DB::table('pages')->select('id','title', 'slug')
                                   ->where('is_navigation','=','yes')
                                   ->where('parent_id','=',$parent_id)
                                   ->orderBy('page_order')
                                   ->get();

DB::table('pages')->select('id','title', 'slug')
                                   ->where('is_navigation','=','yes')
                                   ->where('parent_id','=',$parent_id)
                                   ->whereNull('deleted_at')
                                   ->orderBy('page_order')
                                   ->get();

$objCars = Car::where("color","blue");

SELECT
  *
FROM
  cars
WHERE
  deleted_at IS NULL
AND
  "color" = 'blue'

$objCars = Car::where("color","blue")->orWhere("color","red");

SELECT
  *
FROM
  cars
WHERE
  deleted_at IS NULL
AND
  "color" = 'blue'
OR
  "color" = 'red'

SELECT
  *
FROM
  cars
WHERE
  (
    deleted_at IS NULL
  AND
    "color" = 'blue'
  )
OR
  "color" = 'red'

$objCars = Car::where(
  function ( $query ) {
    $query->where("color","blue");
    $query->orWhere("color","red");
  }
);

SELECT
  *
FROM
  cars
WHERE
  deleted_at IS NULL
AND
  (
    "color" = 'blue'
  OR
    "color" = 'red'
  )

public function __construct()
{
   parent::__construct();

   //Rest of my code
}

Post::all()

<?php

namespace AppModels;

use IlluminateDatabaseEloquentModel;
use IlluminateDatabaseEloquentSoftDeletes;

class Banners extends Model
{
    use SoftDeletes;
    //no need of this below line
    //protected $softDelete = true;
}