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POImporting associated models from single csv in rails 3
 

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  1. POImporting associated models from single csv in rails 3
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    <p>I've been following rails cast episode, <a href="http://railscasts.com/episodes/396-importing-csv-and-excel?view=asciicast" rel="nofollow noreferrer">Importing CSV and excel</a>, but I have a slightly different setup.</p> <p>I have two models, usage(amount) &amp; price(amount). I have it set up so usage has_one price and price belongs_to a usage. In my csv, I have two columns, like so:</p> <pre><code>usage,price 1000,0.1 1500,0.11 </code></pre> <p>I'm trying to import the data so that I can get usage.amount &amp; usage.price.amount into my database. </p> <p>I had a look <a href="https://stackoverflow.com/questions/14642121/when-importing-a-csv-how-do-i-handle-data-in-a-row-that-corresponds-to-an-assoc?rq=1">here</a>, and tried everything there. One thing to note is that I don't have an id column (although I tried with an id column and the code from that question still didn't work).</p> <p>Here is the code from my model:</p> <pre><code>class Usage &lt; ActiveRecord::Base has_one :price, dependent: :destroy accepts_nested_attributes_for :price def self.import(file) CSV.foreach(file.path, headers: true) do |row| Usage.create! row.to_hash end end end </code></pre> <p>Note: I know the above has no reference to importing the price.amount, but anything I tried wouldn't work.</p> <p>Any help on this would be greatly appreciated, thanks!</p> <p><strong>Update</strong></p> <p>Here's how I got it working: (Thanks to <strong>alalani</strong> for helping with the following code.)</p> <pre><code>CSV.foreach(file.path, headers: true) do |row| u = Usage.create(amount: row[0]) u.create_price(amount: row[1]) end </code></pre>
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