Add multiple OR conditions in Magento 2 collection

Magento 2 have addFieldToFilter to apply conditions on collections. Here we will see how can we apply OR condition like (status IS NULL) OR (status = ‘complete’) with the help of addFieldToFilter method. 

Check out the below code to understand the syntax,

$this->customFactory->create()
                    ->getCollection()
                    ->addFieldToFilter(
                        ['status', 'status'],
                        [
                            ['null' => true],
                            ['eq' => 'complete']
                        ]
                    );

Now let’s consider a more complicated with multiple OR conditions, like given below,

(
    (`start_date` >= '2020-01-01') 
    OR 
    (`end_date` < '2020-01-31') 
    OR 
    (
      (
        (`status` IS NULL) 
        OR 
        (`status` = 'complete')
      )
    )
  )

Now let’s see the code in Magento 2 to implement this condition,

$this->customFactory->create()
                     ->getCollection()
                     ->addFieldToFilter(
                         ['start_date', 'end_date', 'status'], 
                         [ 
                             ['gteq' => '2020-01-01'], 
                             ['lt' => '2020-01-31'],
                             [
                                 ['null' => true], 
                                 ['eq' => 'complete']
                             ]
                         ]
                     );

Thanks for reading this blog. Feel free to comment if you face any issue.
Happy Coding