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PONested attributes will not save
 

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    <p>I have searched stackoverflow thoroughly and tried every result that has come up but I am still stuck. Here is the problem.</p> <p>I have an app that allows me to upload music files. Once the file is uploaded, I scan the ID3 data and use that data to populate all the various info for the object in my database....such as title, album, year, genre and so forth. </p> <p>The artist field sometimes has many artists, so for this field I wrote a method that takes all the artists and hashes it as such;</p> <pre><code>{:artist =&gt; [{:name=&gt;"Artist 1"},{:name=&gt;"Artist 2"}]} </code></pre> <p>This data is now included in the object that I want to save to my database and looks as follows;</p> <pre><code>#&lt;Track id: 76, name: nil, title: "song title", tpath: "file_name.mp3", created_at: "2013-06-08 23:31:24", updated_at: "2013-06-08 23:31:24", track_number: 6, artist: {:artist =&gt; [{:name=&gt;"Artist 1"},{:name=&gt;"Artist 2"}]}, album_artist: "Artist Name", year: 2012, genre: "nil", bpm: nil, length: 252, size: 79872, user_id: 2&gt; </code></pre> <p>In my tracks_controller(where all of the action is happening) I have this for my create action;</p> <pre><code>def create @track = Track.new(params[:track]) @track.libraries &lt;&lt; @library @track.parse_id3(@track) @track.update_attributes(@track[:artist]) --&gt;# I also tried @track.artist respond_to do |format| if @track.save format.html { redirect_to library_track_path(@library, @track), notice: 'Track was successfully created.' } format.json { render json: @library_track, status: :created, location: @track } else format.html { render action: "new" } format.json { render json: @track.errors, status: :unprocessable_entity } end end </code></pre> <p>end</p> <p><strong>The problem is that active record is not saving/updating my Artists(in the Artist Table) with the data I am providing, but the track is successfully saved to my database without error.</strong></p> <p>I have the following relationship setup between Artists and Tracks;</p> <pre><code>class Artist &lt; ActiveRecord::Base attr_accessible :age, :birthdate, :first_name, :last_name, :name has_many :tracks, :through =&gt; :artist_tracks has_many :artist_tracks end </code></pre> <p>Join Table looks like;</p> <pre><code>class ArtistTrack &lt; ActiveRecord::Base attr_accessible :album_artist, :artist_id, :track_id belongs_to :artist belongs_to :track end </code></pre> <p>And Track looks like;</p> <pre><code>class Track &lt; ActiveRecord::Base attr_accessible :name, :title, :tpath, :track_number, :artist, :album_artist, :year, :genre, :bpm, :length, :size, :user_id, :artists_attrubutes mount_uploader :tpath, TpathUploader belongs_to :user has_many :libraries, :through =&gt; :track_libraries has_many :track_libraries has_many :playlists, :through =&gt; :playlist_tracks has_many :playlist_tracks has_many :artists, :through =&gt; :artist_tracks has_many :artist_tracks accepts_nested_attributes_for :artists end </code></pre> <p>The only form involved is the form with a single field asking for the location of the file to be uploaded.</p> <p>What am I missing here?</p> <p>Thanks.</p> <hr> <p>I got it to work, here is what was needed.</p> <pre><code>@track.update_attributes(:artists_attributes =&gt; @track.parse_id3(@track)) </code></pre> <p>The <strong>.parse_id3</strong> is a method I wrote that scans all the artist in the MP3's artist field and turns them into;</p> <pre><code>:artists_attributes =&gt; [{:name=&gt;"Artist 1"},{:name=&gt;"Artist 2"}]} </code></pre> <p>I had tried;</p> <pre><code>@track.update_attributes(:artists_attributes) </code></pre> <p>Apparently I needed to add the <strong>@track.parse_id3(@track)</strong> piece for it to work.</p> <p>Thanks for all the responses!</p>
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    1. USuser2209090
    1. USuser2209090
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    1. COI may be wrong, but I think the direction of your nesting is incorrect. `Artist` could `accept_nested_attributes_for` `Track` because the `Track` `belongs_to` the `Artist`. In your example you are trying to link a `Track` to an `Artist` that doesn't yet exist. I think you need to build the relationship the other way around for nested_attributes to work
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      1. USmuttonlamb
    2. COThat hash isn't what nested attributes is expecting. How are you constructing the form?
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      1. USFrederick Cheung
    3. COOh, you're getting it from the id3 tags - i wouldn't use nested attributes here at all - just build the artist objects directly
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      1. USFrederick Cheung
 

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