Magento 2.2 : getcollection is not working in the Block

Question

My custom collection is not working in block file Helloworld.php

<?php
namespace New\MyModule\Block;

use Magento\Framework\View\Element\Template\Context;
use Magento\Framework\View\Element\Template;

class Helloworld extends Template
{
    protected $_modelFactory;

    public function __construct(Context $context,
                                New\MyModule\Model\DataFactory $modelFactory,
                                array $data = array())
    {
        $this->_modelFactory = $modelFactory;
        parent::__construct($context, $data);
    }


    public function getHelloCollection()
        {
            return $this->_modelFactory->create()->getCollection();
        }
}

Model files:

Model\Data.php

<?php


namespace New\Model;

use Magento\Framework\Model\AbstractModel;

    class Data extends AbstractModel
    {   
        protected function _construct()
        {
            $this->_init('New\MyModule\Model\ResourceModel\Data');
        }
    }

Resource model:

Model\ResourceModel\Data.php

<?php

namespace New\MyModel\Model\ResourceModel;


use \Magento\Framework\Model\ResourceModel\Db\AbstractDb;

class Data extends AbstractDb

{

    protected function _construct()

    {

        $this->_init('blog_posts', 'post_id');

    }

}

Collection file:

New\MyModule\model\ResourceModel\Data\Collection.php

<?php


namespace New\MyModule\Model\ResourceModel\Data;


use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;


class Collection extends AbstractCollection

{

    protected function _construct()
    {

        $this->_init(
        'New\MyModule\Model\Data',
        'New\MyModule\Model\ResourceModel\Data');

    }

}

I need to get the collection into my block to fetch the database values. pls help me.

Answer 1

i tested this code and find out only one error

Change

public function __construct(Context $context,
                                New\MyModule\Model\DataFactory $modelFactory,
                                array $data = array())
    {
        $this->_modelFactory = $modelFactory;
        parent::__construct($context, $data);
    }

to

public function __construct(Context $context,
                                \New\MyModule\Model\DataFactory $modelFactory,
                                array $data = array())
    {
        $this->_modelFactory = $modelFactory;
        parent::__construct($context, $data);
    }

Below is my code

QaisarSatti\HelloWorld\Model\Helloworld.php

<?php


     namespace QaisarSatti\HelloWorld\Model;



    class Helloworld extends \Magento\Framework\Model\AbstractModel  
    {   
        protected function _construct()
        {
            $this->_init('QaisarSatti\HelloWorld\Model\ResourceModel\Helloworld');
        }
    }

QaisarSatti\HelloWorld\Model\ResourceModel\Helloworld.php

<?php

namespace QaisarSatti\HelloWorld\Model\ResourceModel;


use \Magento\Framework\Model\ResourceModel\Db\AbstractDb;

class Helloworld extends AbstractDb

{

    protected function _construct()

    {

        $this->_init('blog_posts', 'post_id');

    }

}

QaisarSatti\HelloWorld\Model\ResourceModel\Helloworld\Collection.php

<?php


namespace QaisarSatti\HelloWorld\Model\ResourceModel\Helloworld;


use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;


class Collection extends AbstractCollection

{

    protected function _construct()
    {

        $this->_init(
        'QaisarSatti\HelloWorld\Model\Helloworld',
        'QaisarSatti\HelloWorld\Model\ResourceModel\Helloworld');

    }

}

BLock file

QaisarSatti\HelloWorld\Block\HelloWorld.php

<?php 


namespace QaisarSatti\HelloWorld\Block;

class HelloWorld extends \Magento\Framework\View\Element\Template
{

    protected $_helloworldFactory;
   public function __construct(
       \Magento\Backend\Block\Template\Context $context,
      \QaisarSatti\HelloWorld\Model\HelloworldFactory $helloworldFactory,      
       array $data = []
   ) {


       $this->_helloworldFactory = $helloworldFactory;

       parent::__construct($context, $data);
   }
   public function getHelloCollection()
        {
            return $this->_helloworldFactory->create()->getCollection();
        }

}

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