How to get correct children ids using fields_for "parents[]", parent do |f| using f.fields_for :children, child ?
- by Anatortoise House
I'm editing multiple instances of a parent model in an index view in one form, as in Railscasts #198.
Each parent has_many :children and accepts_nested_attributes_for :children, as in Railscasts #196 and #197
<%= form_tag %>
<% for parent in @parents %>
<%= fields_for "parents[]", parent do |f|
<%= f.text_field :job %>
<%= f.fields_for :children do |cf| %>
<% cf.text_field :chore %>
<% end %>
<% end %>
<% end %>
<% end %>
Given parent.id==1
f.text_field :job correctly generates
<input id="parents_1_job" type="text" value="coding" size="30" name="parents[1][job]">
But cf.text_field :chore generates ids and names that don't have the parent index.
id="parents_children_attributes_0_chore"
name="parents[children_attributes][0][chore]"
If I try passing the specific child object to f.fields_for like this:
<% for child in parent.children %>
<%= f.fields_for :children, child do |cf| %>
<%= cf.text_field :chore %>
<% end %>
<% end %>
I get the same. If I change the method from :children to "[]children" I get
id="parents_1___children_chore"
which gets the right parent_index but doesn't provide an array slot for the child index.
"[]children[]" isn't right either:
id="parents_1__children_3_chore"
as I was expecting attributes_0_chore instead of 3_chore.
Do I need to directly modify an attribute of the FormBuilder object, or subclass FormBuilder to make this work, or is there a syntax that fits this situation?
Thanks for any thoughts.
