cleaning up many more warnings in activerecord [#4180 state:resolved]

Signed-off-by: wycats <wycats@gmail.com>

activerecord/lib/active_record/base.rb

@@ -1042,6 +1042,9 @@ module ActiveRecord #:nodoc:
           object.instance_variable_set(:'@attributes', record)
           object.instance_variable_set(:'@attributes_cache', {})
           object.instance_variable_set(:@new_record, false)
+          object.instance_variable_set(:@readonly, false)
+          object.instance_variable_set(:@destroyed, false)
+          object.instance_variable_set(:@marked_for_destruction, false)
 
           object.send(:_run_find_callbacks)
           object.send(:_run_initialize_callbacks)
@@ -1508,6 +1511,9 @@ module ActiveRecord #:nodoc:
         @attributes_cache = {}
         @new_record = true
         @readonly = false
+        @destroyed = false
+        @marked_for_destruction = false
+
         ensure_proper_type
 
         if scope = self.class.send(:current_scoped_methods)
@@ -1599,12 +1605,12 @@ module ActiveRecord #:nodoc:
 
       # Returns true if this object hasn't been saved yet -- that is, a record for the object doesn't exist yet; otherwise, returns false.
       def new_record?
-        @new_record || false
+        @new_record
       end
 
       # Returns true if this object has been destroyed, otherwise returns false.
       def destroyed?
-        @destroyed || false
+        @destroyed
       end
 
       # Returns if the record is persisted, i.e. it's not a new record and it was not destroyed.

activerecord/lib/active_record/dynamic_finder_match.rb

@@ -7,6 +7,9 @@ module ActiveRecord
 
     def initialize(method)
       @finder = :first
+      @bang   = false
+      @instantiator = nil
+
       case method.to_s
       when /^find_(all_by|last_by|by)_([_a-zA-Z]\w*)$/
         @finder = :last if $1 == 'last_by'

activerecord/lib/active_record/migration.rb

@@ -315,7 +315,9 @@ module ActiveRecord
       end
 
       def announce(message)
-        text = "#{@version} #{name}: #{message}"
+        version = defined?(@version) ? @version : nil
+
+        text = "#{version} #{name}: #{message}"
         length = [0, 75 - text.length].max
         write "== %s %s" % [text, "=" * length]
       end

activerecord/lib/active_record/relation.rb

@@ -18,6 +18,9 @@ module ActiveRecord
       @readonly_value    = nil
       @create_with_value = nil
       @implicit_readonly = nil
+      @limit_value       = nil
+      @offset_value      = nil
+      @loaded            = nil
 
       (ASSOCIATION_METHODS + MULTI_VALUE_METHODS).each {|v| instance_variable_set(:"@#{v}_values", [])}
     end