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PORedmine Plugins - Detecting enabling and disabling of modules
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copied!<p>I'm working with an external framework (redmine) which has one <code>Project</code> model that has_many <code>EnabledModules</code>.</p> <p>Projects can have EnabledModules "attached" or "removed" via the module names, like this:</p> <pre><code>class Project < ActiveRecord::Base ... has_many :enabled_modules, :dependent => :delete_all ... def enabled_module_names=(module_names) enabled_modules.clear module_names = [] unless module_names && module_names.is_a?(Array) module_names.each do |name| enabled_modules << EnabledModule.new(:name => name.to_s) end end end </code></pre> <p>I'd like to detect when new modules are attached/removed via callbacks on <code>EnabledModule</code>, and not modify the "original source code" if possible.</p> <p>I can detect "attachments" like this:</p> <pre><code>class EnabledModule < ActiveRecord::Base belongs_to :project after_create :module_created def module_created logger.log("Module attached to project #{self.project_id}") end end </code></pre> <p>I thought that a <code>before_destroy</code> would work for detecting removals, but it will not. This happens because the <code>enabled_modules.clear</code> call on <code>Project.enabled_module_names=</code>, doesn't invoke 'destroy' on the modules. It just sets their <code>project_id</code> to nil. So I figured I should use a <code>after_update</code> or <code>before_update</code>.</p> <p>If I use <code>after_update</code>, how can I get the 'previous' <code>project_id</code>?</p> <p>If I use <code>before_update</code>, how can I differentiate between modules that are 'just updated' and modules whose project_id is going to be reset to nil?</p> <p>Should I use a totally different approach here?</p> <p>EDIT: I just <a href="https://stackoverflow.com/questions/607069/using-activerecord-is-there-a-way-to-get-the-old-values-of-a-record-during-after/607139#607139">found out</a> that I could get the old values with '_was' (i.e. <code>self.project_was</code>). However, <code>collection.clear</code> doesn't seem to trigger update callbacks. Any other solutions?</p> <p>EDIT 2: Changed title</p>

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