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Add a new test case to demonstrate that subject headers are being properly encoded for multipart messages


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 Rename conditions_scoping_test to method_scoping_test.


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 Rename Base.constrain to Base.with_scope so it doesn't conflict with existing concept of database constraints.  Make scoping more robust: uniform method => parameters, validated method names and supported finder parameters, raise exception on nested scopes.


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Fixed that SQL Server should ignore :size declarations on anything but integer and string in the agnostic schema representation (closes #2756) [Ryan Tomayko]

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Scaffold-generated controller action gives paginate the plural_ rather than singular_name.  Closes #2743.

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script/lighttpd: tail the logfile when running in the foreground, and attempt to guess the port number

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Added skip_before_filter/skip_after_filter for easier control of the filter chain in inheritance hierachies [DHH] Added short-hand to assert_tag so assert_tag :tag => "span" can be written as assert_tag "span" [DHH]

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Added extension capabilities to has_many and has_and_belongs_to_many proxies [DHH] Added find_or_create_by_X as a second type of dynamic finder that'll create the record if it doesn't already exist [DHH] Added constrain scoping for creates using a hash of attributes bound to the :creation key [DHH]

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Add Model.create! to match existing model.save! method.  When save! raises RecordInvalid, you can catch the exception, retrieve the invalid record (invalid_exception.record), and see its errors (invalid_exception.record.errors).

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Correct reader method generation for primary key attribute: handle case when primary_key is defined but its column is nil, such as when the model class is backed by a view.

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Changed 0.blank? to false rather than true since it violates everyone's expectation of blankness.  Closes #2518, Closes #2705.

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