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PORuby on rails nested form model
 

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    <p>I'm trying to use rails nested form_for helper, but I am getting the following error:</p> <p>BlogPage(#49859550) expected, got Array(#31117360)</p> <p><b>Here are my model objects:</b></p> <pre><code>class Blog &lt; ActiveRecord::Base # Table Configuration set_table_name "blog" # Model Configuration belongs_to :item has_many :blog_pages accepts_nested_attributes_for :blog_pages, :allow_destroy =&gt; true end class BlogPage &lt; ActiveRecord::Base # Table Configuration set_table_name "blog_page" # Model Configuration belongs_to :blog end </code></pre> <p><b>Here is the form I generated (left out unnecessary HTML):</b> </p> <pre><code>&lt;% form_for :blog, :url =&gt; { :action =&gt; :create } do |blog_form| %&gt; &lt;%= blog_form.text_field :title, :style =&gt; "width: 400px" %&gt; &lt;% blog_form.fields_for :blog_pages do |page_fields| %&gt; &lt;% @blog.blog_pages.each do |page| %&gt; &lt;%= page_fields.text_area :content, :style =&gt; "width: 100%", :cols =&gt; "10", :rows =&gt; "20" %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p><b>Here are the parameters that are sent to the controller:</b></p> <p>{"commit"=>"Save", "blog"=>{"blog_pages"=>{"content"=>"This is the new blog entries contents."}, "title"=>"This is a new blog entry.", "complete"=>"1"}, "authenticity_token"=>"T1Pr1g9e2AjEMyjtMjLi/ocrDLXzlw6meWoLW5LvFzc="}</p> <p><b>Here is the BlogsController with the create action that gets executed:</b></p> <pre><code>class BlogsController &lt; ApplicationController def new @blog = Blog.new # This is the line where the error gets thrown. # Set up a page for the new blog so the view is displayed properly. @blog.blog_pages[0] = BlogPage.new @blog.blog_pages[0].page_number = 1 respond_to do |format| format.html # Goes to the new.html.erb view. format.xml { render :xml =&gt; @blog } format.js { render :layout =&gt; false} end end def create @blog = Blog.new(params[:blog]) respond_to do |format| if @blog.save render :action =&gt; :show else flash[:notice] = "Error occurred while saving the blog entry." render :action =&gt; :new end end end end </code></pre> <p>If anyone can help me with this I would greatly appreciate it. I'm still pretty new to ruby and the rails framework and couldn't solve the problem on my own by googling.</p> <p>Thanks.</p>
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    1. USBrian DiCasa
    1. USBrian DiCasa
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    1. COYou should add the line number and comment in you code where the error occurs. You should also redirect if @blog.save succeeds. The way it is now, refreshing the browser might cause duplicate records to be inserted. require 'pp' and use 'raise @blog.pretty_inspect' to see what kind of array you've got.
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      1. USSamuel Danielson
    2. COThanks. I added some of the suggestions you recommended. What does adding require 'pp' do?
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      1. USBrian DiCasa
 

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