Check if post has image

I’m displaying a list of posts and I want to indicate if the posts have images.

I’m using this code to check if a post has an image.

<?php

    	$attachments = get_children(array(
            'post_type' => 'attachment',
            'post_mime_type' => 'image',
            'post_parent' => get_the_ID()
        ));

    	echo count($attachments);

    	if(empty($attachments)) {
    		echo ' No image';
    	}else{
    	  echo 'image';
    	}

    ?>

Some of the posts have images but it echo’s ‘No image’

Is there a better way to check if a post has an image.

<?php get_header(); ?>

      	<section class="allIdeas">

      		<?php
      			$allideas_args  = array(
      				'post_type' => 'post',
      				'order' => 'ASC',
      				'orderby' => 'date',
      				'posts_per_page' => 10,
      			);

      			$allideas_loop = new WP_Query($allideas_args);

      			if($allideas_loop->have_posts()):
      				while($allideas_loop->have_posts()):
      					$allideas_loop->the_post();

      		?>

      		<div class="ideaPost">

      			<a href="<?php echo get_permalink($post->ID); ?>">
      				<div class="ideaPost__Info">
      					<?php

      						$attachments = get_children(array(
      					        'post_type' => 'attachment',
      					        'post_mime_type' => 'image',
      					        'post_parent' => $post->ID
      					    ));

      						echo count($attachments);

      						if(count($attachments) > 0) {
      							echo 'image';
      						}else{
      							echo ' No image';
      						}

      					?>

      				</div>
      				<h3 ><?php the_title(); ?></h3>
      				<h4>by </h4>

      				<?php the_excerpt(); ?>
      			</a>
      		</div>	

      		<?php
      			endwhile;
      			endif;
      		?>

      		<?php wp_reset_postdata(); ?>

      	</section>	

      <?php get_footer(); ?>