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PORails Argument Error on .save - Something to do with has_many belongs_to in Model
 

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  1. PORails Argument Error on .save - Something to do with has_many belongs_to in Model
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    <p>I get the following error when trying to save an entry into my database:</p> <p><code>ArgumentError: Unknown key: class</code></p> <p>This happens when I try to define which <code>PageIcon</code> my <code>Page</code> model belongs to.</p> <hr> <p>Page Migration:</p> <pre><code>class CreatePages &lt; ActiveRecord::Migration def change create_table :pages do |t| t.integer "parent_page_id" t.integer "page_image_id", :null =&gt; false t.integer "page_icon_id" t.integer "template_id" t.string "title", :null =&gt; false t.string "path", :default =&gt; "", :null =&gt; false t.string "group" t.datetime "deleted_at" t.boolean "visible", :default =&gt; false t.timestamps end add_index("pages", "parent_page_id") add_index("pages", "page_image_id") add_index("pages", "page_icon_id") add_index("pages", "template_id") add_index("pages", "title") add_index("pages", "path") end end </code></pre> <p>Page Model:</p> <pre><code>class Page &lt; ActiveRecord::Base belongs_to :parent, :class_name =&gt; 'Page', :foreign_key =&gt; 'parent_page_id' has_many :children, :class_name =&gt; 'Page', :foreign_key =&gt; 'parent_page_id' belongs_to :page_image, :class_name =&gt; 'Image', :foreign_key =&gt; 'page_image_id' has_many :sections has_many :attributes belongs_to :page_icon, :class_name =&gt; 'PageIcon', :foreign_key =&gt; 'page_icon_id' validates_uniqueness_of :title, :case_sensitive =&gt; false end </code></pre> <hr> <p>PageIcon Migration</p> <pre><code>class CreatePageIcons &lt; ActiveRecord::Migration def change create_table :page_icons do |t| t.string 'title', :null =&gt; false t.string 'description' t.string 'url', :null =&gt; false t.timestamps end end end </code></pre> <p>PageIcon Model:</p> <pre><code>class PageIcon &lt; ActiveRecord::Base has_many :pages, :class_name =&gt; 'Page', :foreign_key =&gt; 'page_icon_id' end </code></pre> <hr> <p>When I enter the following into rails console I get the error:</p> <pre><code>p = Page.find(1) p.page_icon = PageIcon.find(1) p.save </code></pre> <p>Error: <code>ArgumentError: Unknown key: class</code></p> <hr> <p>Full log:</p> <pre><code>1.9.3-p392 :001 &gt; p = Page.find(4) Page Load (0.8ms) SELECT `pages`.* FROM `pages` WHERE `pages`.`id` = 4 LIMIT 1 =&gt; #&lt;Page id: 4, parent_page_id: nil, page_image_id: 1, page_icon_id: nil, template_id: nil, title: "Food", path: "", group: nil, deleted_at: nil, visible: true, created_at: "2013-03-29 12:21:31", updated_at: "2013-03-29 12:21:31"&gt; 1.9.3-p392 :002 &gt; p.page_icon = PageIcon.find(2) PageIcon Load (0.3ms) SELECT `page_icons`.* FROM `page_icons` WHERE `page_icons`.`id` = 2 LIMIT 1 =&gt; #&lt;PageIcon id: 2, title: "Food", description: nil, url: "page_icons/food.svg", created_at: "2013-03-30 01:37:13", updated_at: "2013-03-30 01:37:13"&gt; 1.9.3-p392 :003 &gt; p.save (0.2ms) BEGIN Page Exists (0.5ms) SELECT 1 AS one FROM `pages` WHERE (`pages`.`title` = 'Food' AND `pages`.`id` != 4) LIMIT 1 (0.2ms) ROLLBACK ArgumentError: Unknown key: class from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:51:in `block in assert_valid_keys' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:50:in `each_key' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:50:in `assert_valid_keys' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/associations/builder/association.rb:33:in `validate_options' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/associations/builder/association.rb:24:in `build' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/autosave_association.rb:139:in `build' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/associations/builder/belongs_to.rb:14:in `build' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/associations/builder/association.rb:12:in `build' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/associations.rb:1431:in `belongs_to' from /Users/RyanKing/Sites/gastromica/app/models/attribute.rb:3:in `&lt;class:Attribute&gt;' from /Users/RyanKing/Sites/gastromica/app/models/attribute.rb:1:in `&lt;top (required)&gt;' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:469:in `load' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:469:in `block in load_file' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:639:in `new_constants_in' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:468:in `load_file' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:353:in `require_or_load' ... 35 levels... from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/validations.rb:50:in `save' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/attribute_methods/dirty.rb:22:in `save' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:259:in `block (2 levels) in save' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:208:in `transaction' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:311:in `with_transaction_returning_status' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:259:in `block in save' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:270:in `rollback_active_record_state!' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/transactions.rb:258:in `save' from (irb):3 from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands/console.rb:47:in `start' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands/console.rb:8:in `start' from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands.rb:41:in `&lt;top (required)&gt;' from script/rails:6:in `require' from script/rails:6:in `&lt;main&gt;'1.9.3-p392 :004 &gt; </code></pre> <hr> <p>When I remove the <code>has_many</code> and <code>belongs_to</code> relationships between the <code>Page</code> &amp; <code>PageIcons</code> models everything works fine again. Does anyone know what going on here? As far as I can tell the syntax is correct.</p> <hr> <p>UPDATE</p> <p>Attribute is reserved word in rails as pointed out here: <a href="http://www.ruby-forum.com/topic/2722528" rel="nofollow">http://www.ruby-forum.com/topic/2722528</a></p> <p>So changing <code>has_many :attributes</code> to <code>has_many :page_attributes, class_name="Attribute"</code> in the <code>Page</code> model does the trick.</p>
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    1. USRyan King
    1. USRyan King
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    1. COI have tested this and it seems to be working fine, so I assume the problem is not on the Page or PageIcon models. The error log alo mentions '/app/models/attribute.rb' -- what do you have in there?
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      1. USLuís Ramalho
    2. COThanks I had accidently written :call instead of :class_name in attributes.rb - I now get the error in return: `undefined method `keys' for []:ActiveRecord::Relation`
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      1. PORails Argument Error on .save - Something to do with has_many belongs_to in Model
      1. USRyan King
    3. COGo it! Attribute is reserved word in rails as pointed out here: http://www.ruby-forum.com/topic/2722528 - Thanks for your help.
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      1. PORails Argument Error on .save - Something to do with has_many belongs_to in Model
      1. USRyan King
 

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