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POFinding forums based on a user's permissions
 

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    <p>I'm implementing a forum system called rBoard. Code is viewable at <a href="http://github.com/radar/rboard" rel="nofollow noreferrer">http://github.com/radar/rboard</a>. I've reached an impasse with the permissions code that I've been trying to implement and I've decided to turn to the all-knowing, ever-caring Stack Overflow to solve this issue.</p> <p>Relevant information is thusly:</p> <p><strong>Category model</strong></p> <pre><code>class Category &lt; ActiveRecord::Base has_many :permissions has_many :groups, :through =&gt; :permissions has_many :forums end </code></pre> <p><strong>Forum model</strong></p> <pre><code>class Forum &lt; ActiveRecord::Base has_many :permissions has_many :groups, :through =&gt; :permissions belongs_to :category end </code></pre> <p><strong>Group model</strong></p> <pre><code>class Group &lt; ActiveRecord::Base has_many :group_users has_many :users, :through =&gt; :group_users belongs_to :owner, :class_name =&gt; "User" end </code></pre> <p><strong>Permission model</strong></p> <pre><code>class Permission &lt; ActiveRecord::Base belongs_to :forum belongs_to :category belongs_to :group end </code></pre> <p><strong>User model</strong> </p> <pre><code>class User &lt; ActiveRecord::Base include Rboard::Permissions has_many :group_users # Note: I am using nested_has_many_through has_many :groups, :through =&gt; :group_users has_many :permissions, :through =&gt; :groups end </code></pre> <p><strong>Permissions module</strong></p> <pre><code>module Rboard::Permissions THINGS = ['forum', 'category'] def self.included(klass) klass.class_eval do # Here we can pass an object to check if the user or any the user's groups # has permissions on that particular option. def overall_permissions(thing = nil) conditions = if thing.nil? THINGS.map do |t| "permissions.#{t}_id " + (thing.nil? ? " IS NULL" : "= #{thing.id}") + " OR permissions.#{t}_id IS NULL" end.join(" AND ") else association = thing.class.to_s.downcase "permissions.#{association}_id = #{thing.id} OR permissions.#{association}_id IS NULL" end permissions.all(:conditions =&gt; conditions) end def can?(action, thing = nil) permissions = overall_permissions(thing) !!permissions.detect { |p| p.send("can_#{action}") } end end end end </code></pre> <p>Hopefully with this you should be able to figure out the fields in the permissions table are like <code>can_see_forum</code> and so on. Extra fields are <code>forum_id</code>, <code>category_id</code> and <code>default</code> (default is currently unused)</p> <p>What I want to know is, how can I find all the forums a group can see? Generally if a forum_id is set, then that permission applies. If there is only one permission for that group without specifying a forum_id or category_id then it is seen to be global to everything. I'm completely at a loss here.</p>
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