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POHow do I create a nested form using Mongoid embedded resources in Rails 3?
 

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  1. POHow do I create a nested form using Mongoid embedded resources in Rails 3?
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    <p>I have a Recipe model, which has Ingredients embedded in it, using Mongoid. </p> <pre><code>class Recipe include Mongoid::Document include Mongoid::Timestamps field :title, :type =&gt; String embeds_many :ingredients accepts_nested_attributes_for :ingredients, :reject_if =&gt; lambda { |a| a[:title].blank? }, :allow_destroy =&gt; true validates :title, :presence =&gt; true end class Ingredient include Mongoid::Document field :name, :type =&gt; String field :quantity, :type =&gt; String embedded_in :recipe, :inverse_of =&gt; :ingredients end </code></pre> <p>I want to be able to create a new recipe, and the associated ingredients for that recipe, at the same time, but I'm struggling to understand how I'd go about doing this. This is what I have thus far:</p> <p>_form.html.erb - Used in Recipe views</p> <pre><code>&lt;%= form_for @recipe do |f| %&gt; ... &lt;li&gt;Title: &lt;%= f.text_field :title %&gt;&lt;/li&gt; &lt;% f.fields_for :ingredients do |builder| %&gt; &lt;%= render "ingredient_fields", :f =&gt; builder %&gt; &lt;% end %&gt; ... &lt;%= f.submit %&gt; </code></pre> <p>_ingredient_fields.html.erb</p> <pre><code>&lt;%= f.text_field :name %&gt; </code></pre> <p>Recipe Controller</p> <pre><code>def new @recipe = Recipe.new @ingredient = @recipe.ingredients.build end def create @recipe = Recipe.new(params[:recipe]) if @recipe.save redirect_to @recipe, notice: 'Recipe was successfully created.' else render action: "new" end end </code></pre> <p>Ingredients Controller</p> <pre><code>def new @recipe = Recipe.find(params[:recipe_id]) @ingredient = @recipe.ingredients.build end def create @recipe = Recipe.find(params[:recipe_id]) @ingredient = @recipe.ingredients.build(params[:ingredient]) # if @recipe.save end </code></pre> <p>This renders the new ingredients form, but there are no fields for the ingredients. Can anyone give me any pointers as to what I'm doing wrong?</p>
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