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POunknown attribute X, but X is not in argument of update_attributes in rails3
 

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  1. POunknown attribute X, but X is not in argument of update_attributes in rails3
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    <p>I am trying to set object's field in the form with accept_nested_attributes. However in the controller when I do :</p> <pre><code>@device.update_attributes(params[:device]) </code></pre> <p>I get :</p> <pre><code>ActiveRecord::UnknownAttributeError "unknown attribute: device_id" </code></pre> <p>but device_id, which is an attribute of other non-related model, is not included in params. Params are like following.</p> <pre><code>{"utf8"=&gt;"✓", "authenticity_token"=&gt;"Xja5GCNRutpZn2c4wKeSx0KO6sNEzh09kWmPQ0/0Hys=", "id"=&gt;"5", "device"=&gt;{"routes_attributes"=&gt;{"0"=&gt;{"name"=&gt;"", "origin_attributes"=&gt;{"name"=&gt;"", "lat"=&gt;"", "lng"=&gt;""}, "destination_attributes"=&gt;{"name"=&gt;"", "lat"=&gt;"", "lng"=&gt;""}}}}, "commit"=&gt;"Create Device"} </code></pre> <p>What can be thought as a cause. Here are my codes.</p> <p>view</p> <pre><code>&lt;%= form_for @device, :url =&gt; {:action =&gt; "do_compose"}, :method =&gt; :post do |f| %&gt; &lt;div class="field"&gt; &lt;%= select_tag(:id, options_for_select( Device.all.collect{|d| [d.name + "/" + d.get_driver().name, d.id] } ),:prompt=&gt;"select a device") %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= render partial:"routes/nested_routes_form", locals: {route_object:@device.get_route(), parent_form:f} %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>controller</p> <pre><code> def do_compose @device = Device.find(params[:id]) respond_to do |format| if @device.update_attributes(params[:device]) format.html { redirect_to @device, notice: 'Device was successfully updated.' } else format.html { render action: comopse } end end end </code></pre> <p>model </p> <pre><code> class Route &lt; ActiveRecord::Base attr_accessible :name, :destination_attributes, :origin_attributes, :waypoints, :driver_id has_many :waypoints has_one :origin, :class_name=&gt;"Origin" has_one :destination, :class_name=&gt;"Destination" belongs_to :device accepts_nested_attributes_for :origin, :destination, :waypoints end class Device &lt; ActiveRecord::Base attr_accessible :id, :name, :password attr_accessible :device_driver_bind_attributes, :drivers_attributes, :routes_attributes, :current_location_attributes has_many :drivers, through: :device_driver_bind has_many :device_driver_bind, dependent: :destroy has_one :current_location, :class_name =&gt; "CurrentLocation" has_many :routes has_many :origins, through: :routes has_many :destinations, through: :routes has_many :waypoints, through: :routes accepts_nested_attributes_for :routes, :current_location, :device_driver_bind end </code></pre>
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    1. COYou might want to check Route for a missing :device_id column. AR expects to be able to set this with `accepts_nested_attributes_for :routes`, to satisfy `belongs_to :device`
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    2. COThat was it! Such an easy mistake.. Thank you very much!!!
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    3. COI'll turn this into a full answer then so you can mark it as solved.
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