From 488699166c3558963fa82d4689a35f8c3fd93f47 Mon Sep 17 00:00:00 2001
From: Carlos Antonio da Silva <carlosantoniodasilva@gmail.com>
Date: Sat, 9 Mar 2013 06:48:04 -0800
Subject: Merge pull request #9616 from
 exviva/multiple_select_name_double_square_brackets

Fix incorrectly appended square brackets to a multiple select box

Before:

    select(:category, [], {}, {:multiple => true, :name => "post[category][]"})
    # => <select name="post[category][][]" ...>

After:

    select(:category, [], {}, {:multiple => true, :name => "post[category][]"})
    # => <select name="post[category][]" ...>

Conflicts:
	actionpack/CHANGELOG.md
	actionpack/lib/action_view/helpers/tags/base.rb
	actionpack/test/template/form_options_helper_test.rb
---
 actionpack/CHANGELOG.md                              | 17 +++++++++++++++++
 actionpack/lib/action_view/helpers/form_helper.rb    |  2 +-
 actionpack/test/template/form_options_helper_test.rb |  8 ++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 86bee63549..f1eb9e84f6 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -5,6 +5,23 @@
 
 ## Rails 3.2.13 (Feb 17, 2013) ##
 
+*   Fix incorrectly appended square brackets to a multiple select box
+    if an explicit name has been given and it already ends with "[]".
+
+    Before:
+
+        select(:category, [], {}, multiple: true, name: "post[category][]")
+        # => <select name="post[category][][]" ...>
+
+    After:
+
+        select(:category, [], {}, multiple: true, name: "post[category][]")
+        # => <select name="post[category][]" ...>
+
+    Backport #9616.
+
+    *Olek Janiszewski*
+
 *   Determine the controller#action from only the matched path when using the
     shorthand syntax. Previously the complete path was used, which led
     to problems with nesting (scopes and namespaces).
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 7df74d96fb..920dc3f794 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -1207,7 +1207,7 @@ module ActionView
             options["id"] = options.fetch("id"){ tag_id }
           end
 
-          options["name"] += "[]" if options["multiple"]
+          options["name"] += "[]" if options["multiple"] && !options["name"].ends_with?("[]")
           options["id"] = [options.delete('namespace'), options["id"]].compact.join("_").presence
         end
 
diff --git a/actionpack/test/template/form_options_helper_test.rb b/actionpack/test/template/form_options_helper_test.rb
index 3009fa5330..72c2609a48 100644
--- a/actionpack/test/template/form_options_helper_test.rb
+++ b/actionpack/test/template/form_options_helper_test.rb
@@ -515,6 +515,14 @@ class FormOptionsHelperTest < ActionView::TestCase
     )
   end
 
+  def test_select_with_multiple_and_with_explicit_name_ending_with_brackets
+    output_buffer =  select(:post, :category, "", {}, :multiple => true, :name => 'post[category][]')
+    assert_dom_equal(
+      "<input type=\"hidden\" name=\"post[category][]\" value=\"\"/><select multiple=\"multiple\" id=\"post_category\" name=\"post[category][]\"></select>",
+      output_buffer
+    )
+  end
+
   def test_select_with_multiple_and_disabled_to_add_disabled_hidden_input
     output_buffer =  select(:post, :category, "", {}, :multiple => true, :disabled => true)
     assert_dom_equal(
-- 
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