Merge branch 'master' into adequaterecord

* master: (70 commits)
  [ci skip] Added link to ruby-lang.org installation.
  Use the index on hidden field
  `collection_check_boxes` respects `:index` option for the hidden filed name.
  docs, double meaning of `serialize` argument. Closes #14284.
  Just call read_attribute, no need to use `send`.
  - Fix lingering reference to `:text` instead of the newer `:plain` - Section references `form_tag` instead of the `form_for` used in the example
  again, read_attribute is public, so just call it
  read_attribute is public, so we should just call it
  Disable assest cache store in docs [ci skip]
  Make counter cache decrementation on destroy idempotent
  Write the failing test case for concurrent counter cache
  [ci skip] Use plain underscore instead of "\_".
  Update documentation to use Rails.application instead
  Add a changelog entry for #14546 [ci skip]
  Move tests for deep_dup and duplicable to object directory
  Missing 'are' in note - [ci skip]
  CollectionHelpers now accepts a readonly option
  Fix a few typos [ci skip]
  Bundle tzinfo-data on :x64_mingw (64-bit Ruby on Windows).
  don't bother with an offset if the offset is zero
  ...

1 files changed, 14 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 6f0b49cf28..77718a14c1 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -995,6 +995,7 @@ module ActionDispatch
             @as         = options[:as]
             @param      = (options[:param] || :id).to_sym
             @options    = options
+            @shallow    = false
           end
 
           def default_actions
@@ -1055,6 +1056,13 @@ module ActionDispatch
             "#{path}/:#{nested_param}"
           end
 
+          def shallow=(value)
+            @shallow = value
+          end
+
+          def shallow?
+            @shallow
+          end
         end
 
         class SingletonResource < Resource #:nodoc:
@@ -1361,7 +1369,7 @@ module ActionDispatch
           end
 
           with_scope_level(:nested) do
-            if shallow? && nesting_depth > 1
+            if shallow? && shallow_nesting_depth > 1
               shallow_scope(parent_resource.nested_scope, nested_options) { yield }
             else
               scope(parent_resource.nested_scope, nested_options) { yield }
@@ -1576,6 +1584,7 @@ module ActionDispatch
           end
 
           def resource_scope(kind, resource) #:nodoc:
+            resource.shallow = @scope[:shallow]
             old_resource, @scope[:scope_level_resource] = @scope[:scope_level_resource], resource
             @nesting.push(resource)
 
@@ -1600,6 +1609,10 @@ module ActionDispatch
             @nesting.size
           end
 
+          def shallow_nesting_depth #:nodoc:
+            @nesting.select(&:shallow?).size
+          end
+
           def param_constraint? #:nodoc:
             @scope[:constraints] && @scope[:constraints][parent_resource.param].is_a?(Regexp)
           end