问题
Research: Rails 4.0 beta, fields_for not accepting pluralized model_name in one-to-many association, Rails 4 Nested Attributes with fields_for Don't Save to Database
First, let's get the most common problem out of the way: incorrectly named attributes parameters for strong parameters. Mine is correctly plural.
class AdultsController < ApplicationController
...
def update
authorize @user
respond_to do |format|
if @user.update_attributes(user_params)
format.html { redirect_to unit_adult_path(@unit, @user), notice: "#{@user.full_name} was successfully updated." }
else
format.html { render action: 'edit' }
end
end
end
def user_params
params.require(:adult).permit(:first_name, :last_name, phones_attributes: [])
end
end
And my models are setup correctly
class User < ActiveRecord::Base
has_many :phones, dependent: :destroy
accepts_nested_attributes_for :phones, allow_destroy: true, reject_if: proc { |a| a["number"].blank? }
end
class Phone < ActiveRecord::Base
belongs_to :user, touch: true
end
And the view
# adult/_form.html.haml
= bootstrap_form_for [@unit, @user] do |f|
= f.text_field :first_name, control_col: 'col-md-4'
= f.text_field :last_name, control_col: 'col-md-4'
= f.fields_for :phones do |f_phone|
= f_phone.form_group do
= f_phone.select :kind, options_for_phones, hide_label: true, layout: :default
= f_phone.phone_field :number, hide_label: true, layout: :default
= f_phone.check_box :_destroy, label: 'remove'
But, when I submit the User form to save
Started PATCH "/units/2/adults/1" for 127.0.0.1 at 2014-07-11 15:20:17 -0700
Processing by AdultsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"pDjDVSiEs5qqHLqnbxQMeGWDOUGvhXPPvgyRGmitmps=", "adult"=>{"first_name"=>"Karl", "last_name"=>"Smith", "phones_attributes"=>{"0"=>{"kind"=>"other", "number"=>"888.1212", "_destroy"=>"0", "id"=>"173"}, "1"=>{"kind"=>"mobile", "number"=>"888.1212", "_destroy"=>"0", "id"=>"174"}} }, "commit"=>"Update Adult", "unit_id"=>"2", "id"=>"1"}
Unpermitted parameters: phones_attributes
I don't understand why the nested data is being rejected by the strong parameter evaluation. It looks correct to me.
The one thing I do notice is that the params data for "phones_attributes" value is a HASH not an ARRAY. In the user_params
, phones_attributes: [] looks like it expecting an ARRAY. So I changed it to a HASH.
def user_params
params.require(:adult).permit(:first_name, :last_name, phones_attributes: {})
end
But now I get the following error.
Unpermitted parameters: 0, 1
So I tried specifying the field names in the "phones_attributes" array.
def user_params
params.require(:adult).permit(:first_name, :last_name, phones_attributes: [:id, :kind, :number])
end
And I still get.
Unpermitted parameters: phones_attributes
I know I must be missing something small, but I can't find my error.
EDIT: all my nested attributes forms do not work. Not 100% sure when they stopped, but ones that worked previously no longer work and have not been modified.
回答1:
Figured this out. I was using javascript to copy the phone fields (kind, number) to make a new set of inputs available for entry. The script was adding non numeric characters to part of the field id, and this was causing rails to ignore all the submitted phone_attributes.
For the next person that comes along...
When fields_for
renders out the fields, it will index each input name for uniqueness when the submitted post data is converted to params. In the example below, this number field
<input id="adult_phones_attributes_0_number" name="adult[phones_attributes][0][number]" type="tel" value="7773331111">
will look something like this when converted to params
"phones_attributes"=>{"0"=>{"number"=>"7773331111"}}
The hash key of "0" comes from the index created by fields_for
. It's the "[0]" portion of the name.
In versions of rails past, if that nested attributes params hash key was not a number, the k/v pair was just ignored. Well now with strong parameters (I'm guessing the culprit), it will reject the entire "phones_attributes" hash.
My script was copying the input field, doing a regex on the html to change the "[0]" index to a random number. But sometimes it would replace it will non-digit characters. And this was causing the problem.
来源:https://stackoverflow.com/questions/24707953/rails-4-1-nested-attributes-and-fields-for-getting-unpermitted-parameters-and-no