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PO
 

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    <p>I don't know how many types you have but I have simply used separate controllers and views for the different types in the past. This way you don't create new object of the base class and try to set the type, you just use the model that inherits from the base class. Each new/edit page for your resources can render a shared partial in the form_for block. The partial would contain your file_field. </p> <p>This way when the form is submitted it will be going to the correct controller, calling the correct resource.new and everything is ok.</p> <p>The drawback of course is more files and whatever page you are linking to "add new file" on you need to add multiple links like "add new this type of file", "add new that type of file" etc.</p> <p>As for setting the type in the form I'm not sure whether that works, I doubt it but just give it a try (Let us know). You could make that type drop down a select_tag and when changed use Javascript to change the action location on the form.</p> <p><strong>Edited and added basic work around</strong></p> <p>Not that I like this solution &amp; I doubt its by no means the best, but if you really don't want separate controllers and you need to get it working you could do something like this:</p> <pre><code>class XmlFile &lt; ActiveRecord::Base end class XmlFileTypeA &lt; XmlFile end class XmlFileTypeB &lt; XmlFile end def create # Leaving this case statement in the controller for simplicity but you probably want to move this to the model case params[:chosen_xml_type] when "file_type_a" @item = XmlFileTypeA.new(params) when "file_type_b" @item = XmlFileTypeB.new(params) else raise "Unknown file type!" etc end end </code></pre>
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    1. PORails STI using ONE form
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    1. COYea I really wanted to avoid creating a separate controller for each, even though currently I only have two document types, it could get to be more - quickly. Rails makes it seem so simple to implement the STI.. and it is - but only to retrieve information I cant even find an example of a 'new' form for an STI implementation.
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    2. COSee my edited post, the new action that renders the view would create @xml_file = XmlFile.new, the create action would create the right file type for you based on the users choice. Hope that's clear as mud!?
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    3. COThis is getting much closer, thanks for the update! Since the controller is what actually instantiates the object wouldn't it have to stay there? I think, after all this research, what I'm looking for is the method in which you can call classify.constanize.new or something like that.. any idea what I'm talking about. You can use the value from the drop down, and create an object of that type..
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