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POCustom ActiveRecord finder invoking named scopes?
 

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    <p>I have a custom finder defined below:</p> <pre><code>class ContainerGateIn &lt;&lt; ActiveRecord::Base ... def self.search(text) result = if text text.split(' ').inject(self) do |result, criteria| case criteria when /^[0-9]{4}-[0-9]{2}-[0-9]{2}$/ result.search_by_date(criteria.to_date) else result.search_by_text(criteria) end end else self end end ... end </code></pre> <p>Where search_by_date and search_by_text are named scopes, and eager is an eager-loading named scope defined as:</p> <pre><code>named_scope :eager, :include =&gt; [{:container_inventory =&gt; {:container =&gt; [:size_type, :grade]}}, :company, :truck, :hauler] </code></pre> <p>The association is setup via a HMT (has_many :through):</p> <pre><code>class ContainerDepot &lt;&lt; ActiveRecord::Base has_many :container_inventories has_many :container_gate_ins, :through =&gt; :container_inventories do end </code></pre> <p>The problem is if the finder is invoked via association nesting from ContainerDepot, it fails with an ActiveRecord::Statement::Invalid, saying that the table has been specified more than once.</p> <pre><code>ContainerDepot.first.container_gate_ins.eager.search(text) =&gt; ActiveRecord::StatementInvalid: PGError: ERROR: table name "container_inventories" specified more than once </code></pre> <p>I could correct it by copying the whole custom finder as an association extension:</p> <pre><code>class ContainerDepot &lt;&lt; ActiveRecord::Base ... has_many :container_gate_ins, :through =&gt; :container_inventories do def search(text) ... custom finder code from ContainerGateIn ... end end ... end </code></pre> <p>It is not very DRY though and introduces a very unnecessary and potentially problematic redundancy, as the custom finder will have to be changed from time to time to accomodate additional search logic.</p> <p>Any ideas on how this could be done better?</p>
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