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Fix fields_for documentation with index option [ci skip]

- fields_for documentation with index option was wrong.
- It does not work with passing model as it is.
- Changed the example by passing id of the address object.
- Fixes #13125.
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commit 3cf5d2b75bca5eb0578643780bfeb50e75ba59be 1 parent f1764a2
@prathamesh-sonpatki prathamesh-sonpatki authored
Showing with 10 additions and 3 deletions.
  1. +10 −3 guides/source/form_helpers.md
13 guides/source/form_helpers.md
@@ -751,7 +751,7 @@ You might want to render a form with a set of edit fields for each of a person's
<%= form_for @person do |person_form| %>
<%= person_form.text_field :name %>
<% @person.addresses.each do |address| %>
- <%= person_form.fields_for address, index: address do |address_form|%>
+ <%= person_form.fields_for address, index: address.id do |address_form|%>
<%= address_form.text_field :city %>
<% end %>
<% end %>
@@ -774,9 +774,16 @@ This will result in a `params` hash that looks like
{'person' => {'name' => 'Bob', 'address' => {'23' => {'city' => 'Paris'}, '45' => {'city' => 'London'}}}}
```
-Rails knows that all these inputs should be part of the person hash because you called `fields_for` on the first form builder. By specifying an `:index` option you're telling Rails that instead of naming the inputs `person[address][city]` it should insert that index surrounded by [] between the address and the city. If you pass an Active Record object as we did then Rails will call `to_param` on it, which by default returns the database id. This is often useful as it is then easy to locate which Address record should be modified. You can pass numbers with some other significance, strings or even `nil` (which will result in an array parameter being created).
+Rails knows that all these inputs should be part of the person hash because you
+called `fields_for` on the first form builder. By specifying an `:index` option
+you're telling Rails that instead of naming the inputs `person[address][city]`
+it should insert that index surrounded by [] between the address and the city.
+This is often useful as it is then easy to locate which Address record
+should be modified. You can pass numbers with some other significance,
+strings or even `nil` (which will result in an array parameter being created).
-To create more intricate nestings, you can specify the first part of the input name (`person[address]` in the previous example) explicitly, for example
+To create more intricate nestings, you can specify the first part of the input
+name (`person[address]` in the previous example) explicitly:
```erb
<%= fields_for 'person[address][primary]', address, index: address do |address_form| %>
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