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体验新版 GitCode,发现更多精彩内容 >>
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0581c1a9
编写于
1月 24, 2012
作者:
A
Aaron Patterson
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电子邮件补丁
差异文件
use fetch rather than both Hash#key? and Hash#[]
上级
148f849c
变更
1
隐藏空白更改
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并排
Showing
1 changed file
with
51 addition
and
49 deletion
+51
-49
activerecord/lib/active_record/attribute_methods/read.rb
activerecord/lib/active_record/attribute_methods/read.rb
+51
-49
未找到文件。
activerecord/lib/active_record/attribute_methods/read.rb
浏览文件 @
0581c1a9
...
...
@@ -58,66 +58,68 @@ def type_cast_attribute(attr_name, attributes, cache = {}) #:nodoc:
end
protected
# We want to generate the methods via module_eval rather than define_method,
# because define_method is slower on dispatch and uses more memory (because it
# creates a closure).
#
# But sometimes the database might return columns with characters that are not
# allowed in normal method names (like 'my_column(omg)'. So to work around this
# we first define with the __temp__ identifier, and then use alias method to
# rename it to what we want.
def
define_method_attribute
(
attr_name
)
cast_code
=
attribute_cast_code
(
attr_name
)
generated_attribute_methods
.
module_eval
<<-
STR
,
__FILE__
,
__LINE__
+
1
def __temp__
#{
internal_attribute_access_code
(
attr_name
,
cast_code
)
}
end
alias_method '
#{
attr_name
}
', :__temp__
undef_method :__temp__
STR
generated_external_attribute_methods
.
module_eval
<<-
STR
,
__FILE__
,
__LINE__
+
1
def __temp__(v, attributes, attributes_cache, attr_name)
#{
external_attribute_access_code
(
attr_name
,
cast_code
)
}
end
alias_method '
#{
attr_name
}
', :__temp__
undef_method :__temp__
STR
end
# We want to generate the methods via module_eval rather than define_method,
# because define_method is slower on dispatch and uses more memory (because it
# creates a closure).
#
# But sometimes the database might return columns with characters that are not
# allowed in normal method names (like 'my_column(omg)'. So to work around this
# we first define with the __temp__ identifier, and then use alias method to
# rename it to what we want.
def
define_method_attribute
(
attr_name
)
cast_code
=
attribute_cast_code
(
attr_name
)
generated_attribute_methods
.
module_eval
<<-
STR
,
__FILE__
,
__LINE__
+
1
def __temp__
#{
internal_attribute_access_code
(
attr_name
,
cast_code
)
}
end
alias_method '
#{
attr_name
}
', :__temp__
undef_method :__temp__
STR
private
def
cacheable_column?
(
column
)
attribute_types_cached_by_default
.
include?
(
column
.
type
)
end
generated_external_attribute_methods
.
module_eval
<<-
STR
,
__FILE__
,
__LINE__
+
1
def __temp__(v, attributes, attributes_cache, attr_name)
#{
external_attribute_access_code
(
attr_name
,
cast_code
)
}
end
alias_method '
#{
attr_name
}
', :__temp__
undef_method :__temp__
STR
end
def
internal_attribute_access_code
(
attr_name
,
cast_code
)
access_code
=
"(v=@attributes[attr_name]) &&
#{
cast_code
}
"
private
def
cacheable_column?
(
column
)
attribute_types_cached_by_default
.
include?
(
column
.
type
)
end
unless
attr_name
==
primary_key
access_code
.
insert
(
0
,
"missing_attribute(attr_name, caller) unless @attributes.has_key?(attr_name); "
)
end
def
internal_attribute_access_code
(
attr_name
,
cast_code
)
if
attr_name
==
primary_key
access_code
=
"v = @attributes[attr_name];"
else
access_code
=
"v = @attributes.fetch(attr_name) { missing_attribute(attr_name, caller) };"
end
if
cache_attribute?
(
attr_name
)
access_code
=
"@attributes_cache[attr_name] ||= (
#{
access_code
}
)"
end
access_code
<<
"v &&
#{
cast_code
}
;"
"attr_name = '
#{
attr_name
}
';
#{
access_code
}
"
if
cache_attribute?
(
attr_name
)
access_code
=
"@attributes_cache[attr_name] ||= (
#{
access_code
}
)"
end
def
external_attribute_access_code
(
attr_name
,
cast_code
)
access_code
=
"v &&
#{
cast_code
}
"
"attr_name = '
#{
attr_name
}
';
#{
access_code
}
"
end
if
cache_attribute?
(
attr_name
)
access_code
=
"attributes_cache[attr_name] ||= (
#{
access_code
}
)"
end
def
external_attribute_access_code
(
attr_name
,
cast_code
)
access_code
=
"v &&
#{
cast_code
}
"
access_code
if
cache_attribute?
(
attr_name
)
access_code
=
"attributes_cache[attr_name] ||= (
#{
access_code
}
)"
end
def
attribute_cast_code
(
attr_name
)
columns_hash
[
attr_name
].
type_cast_code
(
'v'
)
end
access_code
end
def
attribute_cast_code
(
attr_name
)
columns_hash
[
attr_name
].
type_cast_code
(
'v'
)
end
end
# Returns the value of the attribute identified by <tt>attr_name</tt> after it has been typecast (for example,
...
...
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