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-rw-r--r--guides/source/form_helpers.md9
1 files changed, 8 insertions, 1 deletions
diff --git a/guides/source/form_helpers.md b/guides/source/form_helpers.md
index 4c02c99cc7..90004c611b 100644
--- a/guides/source/form_helpers.md
+++ b/guides/source/form_helpers.md
@@ -687,7 +687,14 @@ class LabellingFormBuilder < ActionView::Helpers::FormBuilder
end
```
-If you reuse this frequently you could define a `labeled_form_for` helper that automatically applies the `builder: LabellingFormBuilder` option.
+If you reuse this frequently you could define a `labeled_form_for` helper that automatically applies the `builder: LabellingFormBuilder` option:
+
+```ruby
+def labeled_form_for(record, options = {}, &block)
+ options.merge! builder: LabellingFormBuilder
+ form_for record, options, &block
+end
+```
The form builder used also determines what happens when you do