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POUsing Delta Indexes for associations in Thinking Sphinx
 

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    <p>I have a Product model:</p> <pre><code>class Product &lt; ActiveRecord::Base belongs_to :subcategory define_index do # fields indexes subcategory.name, :as =&gt; :subcategory, :sortable =&gt; true, :facet =&gt; true # attributes has subcategory_id, created_at, updated_at #properties set_property :delta =&gt; true </code></pre> <p>Now, suppose that a user updates a subcategory name, which is the proper way to update the products delta index?</p> <p>According to this documentation: <a href="http://freelancing-god.github.com/ts/en/deltas.html" rel="nofollow">http://freelancing-god.github.com/ts/en/deltas.html</a>, a <em>save</em> message should be sent to the product, so in this case I should go for each product related with the subcategory and send the <em>save</em> message, something like this:</p> <pre><code>class Subcategory &lt; ActiveRecord::Base has_many :products after_save :set_product_delta_flag private def set_product_delta_flag products.each { |product| product.delta = true product.save } end end </code></pre> <p>I think that this is overkilling because we have like 100.000 products per subcategory. Is this the correct way to update the delta index? Am I missing something?</p> <p>After adding this:</p> <pre><code>def set_product_delta_flag Product.update_all ['delta = ?', true], ['subcategory_id = ?', id] Product.index_delta end </code></pre> <p>I'm always receiving this error:</p> <p>NoMethodError (undefined method `index_delta' for #):</p> <p>So, the solution to this problem was to send the message *define_indexes* to the Product model. </p> <p>After fixing this issue, everything was ok, but the delta_index was not correctly updated, I needed to do <em>save</em> twice to the subcategory model.</p> <p>So my final solution is this one:</p> <pre><code>after_commit :set_product_delta_flag private def set_product_delta_flag Product.define_indexes Product.update_all ['delta = ?', true], ['subcategory_id = ?', id] Product.index_delta end </code></pre> <p>Using <strong>after_commit</strong> and <strong>define_indexes</strong> is the correct solution? Its the only one that I've found.</p>
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