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POIs it possible to manipulate a has_many through in memory only?
 

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  1. POIs it possible to manipulate a has_many through in memory only?
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    <p><strong>Platform:</strong> Rails 3</p> <p><strong>Requirement:</strong></p> <p>A form (<code>businesses#edit</code>) that allows a user to submit an update to a <code>Business</code> record (<code>businesses#update</code>.) When submitted <code>businesses#update</code> will not persist the changes to the database but will instead send an email with the new information for manual review.</p> <p><strong>How it's accomplished:</strong></p> <p>Load the <code>Business</code> model, update the properties in memory, pass it to an <code>ActionMailer</code>, finish without ever saving the model.</p> <p><strong>Problem:</strong></p> <p>The <code>Business</code> model has a <code>has_many :business_categories :through :business_categories_businesses</code> which is a <code>has_many :business_categories_businesses</code> and whenever I manipulate the <code>Business.business_categories</code> (<code>@business.business_categories = BusinessCategory.where(:id =&gt; params[:business][:business_categories])</code> for example.) the changes are immediately persisted to the database.</p> <p>I can not find any way of manipulating that collection in memory only so that it can be passed to an action mailer. In the short-term I'm going to hack it by not doing the assignment and simply pass the new collection of <code>BusinessCategories</code> to the ActionMailer to work out itself, but now this is just annoying me and I defer to the collective wisdom of the crowd:</p> <p>It is possible to manipulate has_many relations in memory only and if so how? Please save my sanity.</p> <p>Thank you in advance!</p>
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    1. USDaniel Pehrson
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      1. USKalendae
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    1. CODid you ever figure this out? Just spent the better part of my day coming to the same conclusion...
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      1. USJon M
    2. COI unfortunately did not ever figure this out. My apologies for the late reply, I don't check SO on a regular basis :(
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      1. USDaniel Pehrson
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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