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PORails featured image association?
 

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  1. PORails featured image association?
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    <p>I've been trying to figure out how to associate my models on a project I've been working on for a while, and I've come here for help a couple times before, but I never got a satisfactory answer. I have two models: Post and Image. Every post has several images attached to it and posts can share images, so a HABTM relationship made sense for that, like this:</p> <pre><code>class Post &lt; ActiveRecord::Base has_and_belongs_to_many :images end class Image &lt; ActiveRecord::Base has_and_belongs_to_many :posts end </code></pre> <p>The problem now is that I want each post to have a single 'featured image.' How do I do this? The first thought that comes to mind is a simple <code>has_one :featured_image</code> on the post and <code>belongs_to :post_featured_on</code> on the image, but the problem with that is that the same image can be featured on multiple posts.</p> <p>So the next idea I came up with is to reverse the relationship: <code>belongs_to :featured_image</code> on the post and <code>has_many :posts_featured_on</code> on the image. The problem with that is that it isn't very semantic and rails doesn't seem to want to let me set a post's featured image from its form, like this in the controller: <code>Post.new(:featured_image =&gt; Image.find(params[:image_id]))</code></p> <p>So the next idea suggested to me was a second HABTM relationship, like so: <code>has_and_belongs_to_many :featured_images</code>. There's an obvious problem with this, it's plural. I tried putting <code>unique: true</code> on the post_id column in the migration, but that didn't help the fact that I kept having to do this in my code: <code>post.featured_images.first</code> which can be very frustrating.</p> <p>The last idea I tried was a <code>has_many :posts, through: :attachment</code> and <code>has_one :featured_posts, through: :attachment</code> in place of the original HABTM, but these just seems unnecessarily cumbersome, and rails doesn't seem to want to let me assign the images on the fly this way like <code>Post.new(:featured_image =&gt; Image.find(params[:image_id]))</code>.</p> <p>Is there any good way to do this? Have I done something wrong in my previous attempts? Shouldn't this just be a simple foreign key on the post table? Why does it have to be so difficult?</p>
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    1. USDylan Karr
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