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POHow to display highest rated albums through a has_many reviews relationship
 

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  1. POHow to display highest rated albums through a has_many reviews relationship
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    <p>I'm setting up a simple ruby/rails app where users can review albums. On an album's show page I average all the user reviews associated with that album through this code in my albums controller </p> <pre><code>def show @album = Album.find_by_id(params[:id]) if @album.reviews.present? @ratings = Review.where(album_id: @album).average(:rating).truncate(2) else render 'show' end end </code></pre> <p>This gives me an average rating for each album. On my home page (routed through a different controller) I want to display the top 7 albums with the highest average rating. </p> <p>What I originally did was put this code into the separate home page controller: </p> <pre><code>@albums = Album.all @ratings = @albums.each {|album| album.reviews.average(:rating).to_f} @ranked_ratings = @ratings.sort_by {|rating| rating} @top_seven = @ranked_ratings.reverse[0...7] </code></pre> <p>I thought I found the solution until I realized all I'm showing is the last 7 albums entered into the database.</p> <p>Going back to the drawing board I have been able to get an array of all the albums (each element within the array is a list of reviews associated with that album) with this code in my controller:</p> <pre><code>@albums = Album.all @ratings = @albums.collect {|album| album.reviews} </code></pre> <p>I'm stuck at this point trying to figure out how to cycle through @ratings and find the average rating for each album_id, then order those records by the highest average rating and display them in a view. </p>
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