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POaccepts_nested_attributes_for and nested_form plugin
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  1. POaccepts_nested_attributes_for and nested_form plugin
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    copied!<p>I've the following code in a _form.html.haml partial, it's used for new and edit actions. (fyi I use the Ryan Bates' plugin <a href="http://github.com/ryanb/nested_form" rel="nofollow noreferrer">nested_form</a>)</p> <pre><code>.fields - f.fields_for :transportations do |builder| = builder.collection_select :person_id, @people, :id, :name, {:multiple =&gt; true} = builder.link_to_remove 'effacer' = f.link_to_add "ajouter", :transportations </code></pre> <p>works fine for the new action... for the edit action, as explain in the doc, I've to add the :id of already existing associations, so, I've to add something like</p> <pre><code>= builder.hidden_field :id, ?the value? if ?.new_record? </code></pre> <p>How can I get the value?</p> <p>Here is the doc of accepts_nested_attributes_for for reference (source: <a href="http://github.com/rails/rails/blob/master/activerecord/lib/active_record/nested_attributes.rb#L332" rel="nofollow noreferrer">http://github.com/rails/rails/blob/master/activerecord/lib/active_record/nested_attributes.rb#L332</a>)</p> <pre><code># Assigns the given attributes to the collection association. # # Hashes with an &lt;tt&gt;:id&lt;/tt&gt; value matching an existing associated record # will update that record. Hashes without an &lt;tt&gt;:id&lt;/tt&gt; value will build # a new record for the association. Hashes with a matching &lt;tt&gt;:id&lt;/tt&gt; # value and a &lt;tt&gt;:_destroy&lt;/tt&gt; key set to a truthy value will mark the # matched record for destruction. # # For example: # # assign_nested_attributes_for_collection_association(:people, { # '1' =&gt; { :id =&gt; '1', :name =&gt; 'Peter' }, # '2' =&gt; { :name =&gt; 'John' }, # '3' =&gt; { :id =&gt; '2', :_destroy =&gt; true } # }) # # Will update the name of the Person with ID 1, build a new associated # person with the name `John', and mark the associatied Person with ID 2 # for destruction. # # Also accepts an Array of attribute hashes: # # assign_nested_attributes_for_collection_association(:people, [ # { :id =&gt; '1', :name =&gt; 'Peter' }, # { :name =&gt; 'John' }, # { :id =&gt; '2', :_destroy =&gt; true } # ]) </code></pre> <p>Thanks for your help.</p>
 

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