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@@ -1,5 +1,7 @@
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 *SVN*
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+* Change validates_uniqueness_of :case_sensitive option default back to true (from [9160]).  Love your database columns, don't LOWER them.  [rick]
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+
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 * Ensure that save on child object fails for invalid belongs_to association. Closes #11555. [rubyruy]
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 * Add support for interleaving migrations by storing which migrations have run in the new schema_migrations table. Closes #11493 [jordi]

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@@ -603,7 +603,7 @@
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       # Configuration options:
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       # * <tt>message</tt> - Specifies a custom error message (default is: "has already been taken")
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       # * <tt>scope</tt> - One or more columns by which to limit the scope of the uniqueness constraint.
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-      # * <tt>case_sensitive</tt> - Looks for an exact match.  Ignored by non-text columns (false by default).
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+      # * <tt>case_sensitive</tt> - Looks for an exact match.  Ignored by non-text columns (true by default).
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       # * <tt>allow_nil</tt> - If set to true, skips this validation if the attribute is null (default is: false)
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       # * <tt>allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is: false)
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       # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should
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@@ -613,7 +613,7 @@
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       #   not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }).  The
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       #   method, proc or string should return or evaluate to a true or false value.
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       def validates_uniqueness_of(*attr_names)
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-        configuration = { :message => ActiveRecord::Errors.default_error_messages[:taken] }
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+        configuration = { :message => ActiveRecord::Errors.default_error_messages[:taken], :case_sensitive => true }
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         configuration.update(attr_names.extract_options!)
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         validates_each(attr_names,configuration) do |record, attr_name, value|