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POMass-assign attributes fails in nested form. Silent error?
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  1. POMass-assign attributes fails in nested form. Silent error?
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    copied!<p>There are several questions here that <a href="https://stackoverflow.com/questions/4525962/how-do-i-make-nested-attributes-work-in-rails3">cover</a> <a href="https://stackoverflow.com/questions/4579279/accepts-nested-attributes-for-causing-sqlexception">this</a> <a href="https://stackoverflow.com/questions/4381897/accepts-nested-attributes-not-saving-any-changes">already</a>, I know. I am new to programming and rails, so please bear with me. My goal is to collect <code>n</code> tag objects and display them in my show and index actions.</p> <p><strong>UPDATE</strong> Thanks to both guys who answered. Each suggestion nudged me in the right direction. I am able to get the rake task to create posts by passing in an empty array to initialize the <code>tags</code> object. However tags are still not created. On further inspection I get the following SQL exception:</p> <pre><code>irb(main):002:0&gt; u.posts.build(title: "a new day", tags: "jump") WARNING: Can't mass-assign protected attributes: tags (1.7ms) SELECT 1 FROM "posts" WHERE "posts"."title" = 'a new day' LIMIT 1 (0.5ms) COMMIT =&gt; #&lt;Post id: nil, title: "a new day", description: nil, content: nil, user_id: 1, created_at: nil, updated_at: nil&gt; </code></pre> <p>My set up is as follows:</p> <p><code>Tag</code> Model</p> <pre><code>class Tag &lt; ActiveRecord::Base belongs_to :post end </code></pre> <p><code>Post</code> Model</p> <pre><code>class Post &lt; ActiveRecord::Base has_many :tags, autosave: true attr_accessible :title, :description, :content, :tags_attributes accepts_nested_attributes_for :tags, allow_destroy: true, reject_if: lambda {|attrs| attrs.all? {|key, value| value.blank?}} #add n number of form fields to capture tags in each article. def with_blank_tags(n = 3) n.times do tags.build end self end end </code></pre> <p>'View' code</p> <pre><code>&lt;%= form_for(@post.with_blank_tags) do |f| %&gt; &lt;div class="field"&gt; &lt;%= f.fields_for(:tags) do |tags| %&gt; &lt;%= unless tags.object.new_record? tags.check_box('_destroy') + tags.label('_destroy', 'Remove Tag') end%&gt; &lt;%= tags.label :tags, "Add a Tag"%&gt; &lt;%= tags.text_field :tags %&gt; &lt;%end%&gt; &lt;/div&gt; &lt;%end%&gt; </code></pre> <p>'Controller' code</p> <pre><code>def new @post = @user.posts.build end def create @post = @user.posts.build(params[:post]) if @post.save? respond_to do |format| format.html { redirect_to @post, notice: 'Post was successfully created.' } else format.html { render action: :new } end end end </code></pre> <p>My rake task:</p> <pre><code>namespace :db do desc "Fill database with sample data" task :posts =&gt; :environment do Rake::Task['db:reset'].invoke make_users make_posts end end def make_users puts "making users..." 5.times do |n| name = Faker::Name.name password = "foo" email = "example-#{n+1}@example.com" @user=User.create!( codename: name, email: email, password: password, password_confirmation: password) end end def make_posts puts "making posts..." User.all(:limit =&gt; 3).each do |user| 10.times do content = Faker::Lorem.paragraphs(3) description = Faker::Lorem.words(10) title = Faker::Lorem.words(4) tag = [] post = user.posts.create!(title: title, description: description, content: content, tags_attributes: tag) end end end </code></pre>
 

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