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POhas_many through update issue
 

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    <p>Been trying to sort this for over a day now, and I am sure that it is something simple that I am missing.</p> <p>I have a project, which can have one main category and two optional categories. My relevant code for the project model:</p> <pre><code>has_many :project_categories has_one :optional_category_1, :through =&gt; :project_categories, :conditions =&gt; 'is_main_category = 0', :order =&gt; 'category_id', :source =&gt; :category, :class_name =&gt; 'Category' has_one :optional_category_2, :through =&gt; :project_categories, :conditions =&gt; 'is_main_category = 0', :order =&gt; 'category_id DESC', :source =&gt; :category, :class_name =&gt; 'Category' has_one :main_category, :through =&gt; :project_categories, :conditions =&gt; 'is_main_category = 1', :source =&gt; :category, :class_name =&gt; 'Category' </code></pre> <p>The relevant code from the Category class:</p> <pre><code>has_many :project_categories has_many :projects, :through =&gt; :project_categories, :source =&gt; :project </code></pre> <p>and from the ProjectCategory class:</p> <pre><code>class ProjectCategory &lt; ActiveRecord::Base belongs_to :project belongs_to :category end </code></pre> <p>In my view:</p> <pre><code> Main Category: &lt;%= f.select(:main_category, Category.find(:all, :order =&gt; 'parent_id, categories.desc').collect {|c| [c.display_name, c.id] }, :prompt =&gt; "Select a Main Category") %&gt;&lt;br&gt; Optional Category 1: &lt;%= f.select(:optional_category_1, Category.find(:all, :order =&gt; 'parent_id, categories.desc').collect {|c| [c.display_name, c.id] }, :prompt =&gt; "Select an Optional Category") %&gt;&lt;br&gt; Optional Category 2: &lt;%= f.select(:optional_category_2, Category.find(:all, :order =&gt; 'parent_id, categories.desc').collect {|c| [c.display_name, c.id] }, :prompt =&gt; "Select an Optional Category") %&gt;&lt;br&gt; </code></pre> <p>and in my controller:</p> <pre><code> @project.attributes = params[:project] </code></pre> <p>Ok, so when updating an existing project, I get the following error:</p> <pre><code>undefined method `update_attributes' for #&lt;Class:0x82efce0&gt; </code></pre> <p>and the relevant stack trace:</p> <pre><code>C:/Software/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/associations.rb:1255:in `main_category=' C:/Software/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:2745:in `send' C:/Software/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:2745:in `attributes=' C:/Software/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:2741:in `each' C:/Software/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:2741:in `attributes=' C:/Development/craftbits_rails/app/controllers/projects_controller.rb:85:in `manage_project' </code></pre> <p>Is it saying that there is an issue with main_category and that it is a generic class? But why? The association defines it correctly AFAIK.</p> <p>Any help appreciated!</p> <p>Vikram</p>
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