Ruby rescue custom exception
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0
In following example:
class Foo
class MyCustomerror < StandardError
def message
"My custom error"
end
end
def self.do_standard
1 / 0
rescue StandardError => e
puts e.message
end
def self.do_custom
1 / 0
rescue MyCustomerror => e
puts e.message
end
end
I have a problem with call rescue block which params is MyCustomerror.
If i call Foo.do_standard, rescue block is called, however when i call Foo.do_custom rescue block with MyCustomerror isn't called. Where is the problem?
ruby exception custom-exceptions
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
add a comment |
0
In following example:
class Foo
class MyCustomerror < StandardError
def message
"My custom error"
end
end
def self.do_standard
1 / 0
rescue StandardError => e
puts e.message
end
def self.do_custom
1 / 0
rescue MyCustomerror => e
puts e.message
end
end
I have a problem with call rescue block which params is MyCustomerror.
If i call Foo.do_standard, rescue block is called, however when i call Foo.do_custom rescue block with MyCustomerror isn't called. Where is the problem?
ruby exception custom-exceptions
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
1
rescue MyCustomerrorrescuesMyCustomerrorand its subclasses. ButZeroDivisionErrorisn't one of its subclasses.
– Stefan
Nov 16 '18 at 16:35
add a comment |
0
0
0
In following example:
class Foo
class MyCustomerror < StandardError
def message
"My custom error"
end
end
def self.do_standard
1 / 0
rescue StandardError => e
puts e.message
end
def self.do_custom
1 / 0
rescue MyCustomerror => e
puts e.message
end
end
I have a problem with call rescue block which params is MyCustomerror.
If i call Foo.do_standard, rescue block is called, however when i call Foo.do_custom rescue block with MyCustomerror isn't called. Where is the problem?
ruby exception custom-exceptions
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
In following example:
class Foo
class MyCustomerror < StandardError
def message
"My custom error"
end
end
def self.do_standard
1 / 0
rescue StandardError => e
puts e.message
end
def self.do_custom
1 / 0
rescue MyCustomerror => e
puts e.message
end
end
I have a problem with call rescue block which params is MyCustomerror.
If i call Foo.do_standard, rescue block is called, however when i call Foo.do_custom rescue block with MyCustomerror isn't called. Where is the problem?
ruby exception custom-exceptions
ruby exception custom-exceptions
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
asked Nov 16 '18 at 14:40
user3471671user3471671
69112
69112
1
rescue MyCustomerrorrescuesMyCustomerrorand its subclasses. ButZeroDivisionErrorisn't one of its subclasses.
– Stefan
Nov 16 '18 at 16:35
add a comment |
1
rescue MyCustomerrorrescuesMyCustomerrorand its subclasses. ButZeroDivisionErrorisn't one of its subclasses.
– Stefan
Nov 16 '18 at 16:35
1
1
rescue MyCustomerror rescues MyCustomerror and its subclasses. But ZeroDivisionError isn't one of its subclasses.– Stefan
Nov 16 '18 at 16:35
rescue MyCustomerror rescues MyCustomerror and its subclasses. But ZeroDivisionError isn't one of its subclasses.– Stefan
Nov 16 '18 at 16:35
add a comment |
1 Answer
1
active
oldest
votes
2
There is no place in your code that could raise a MyCustomError exception, so there is nothing to rescue from. The only exception that could possibly be raised by that code is a ZeroDivisionError.
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
It might be worth noting thatZeroDivisionErrorinherits fromStandardErrorwhich is whyrescue StandardErrorrescues it.
– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raiseZeroDivisionError.ZeroDivisionErroris aStandardErrorso.do_standardrescues it.ZeroDivisionErroris not aMyCustomerrorand so.do_customdoes not rescue it.
– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:MyCustomerrorinherits fromStandardError. In the class hierarchy,MyCustomerrorandZeroDivisionErrorare siblings.
– Stefan
Nov 17 '18 at 13:57
add a comment |
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1 Answer
1
active
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
There is no place in your code that could raise a MyCustomError exception, so there is nothing to rescue from. The only exception that could possibly be raised by that code is a ZeroDivisionError.
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
It might be worth noting thatZeroDivisionErrorinherits fromStandardErrorwhich is whyrescue StandardErrorrescues it.
– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raiseZeroDivisionError.ZeroDivisionErroris aStandardErrorso.do_standardrescues it.ZeroDivisionErroris not aMyCustomerrorand so.do_customdoes not rescue it.
– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:MyCustomerrorinherits fromStandardError. In the class hierarchy,MyCustomerrorandZeroDivisionErrorare siblings.
– Stefan
Nov 17 '18 at 13:57
add a comment |
2
There is no place in your code that could raise a MyCustomError exception, so there is nothing to rescue from. The only exception that could possibly be raised by that code is a ZeroDivisionError.
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
It might be worth noting thatZeroDivisionErrorinherits fromStandardErrorwhich is whyrescue StandardErrorrescues it.
– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raiseZeroDivisionError.ZeroDivisionErroris aStandardErrorso.do_standardrescues it.ZeroDivisionErroris not aMyCustomerrorand so.do_customdoes not rescue it.
– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:MyCustomerrorinherits fromStandardError. In the class hierarchy,MyCustomerrorandZeroDivisionErrorare siblings.
– Stefan
Nov 17 '18 at 13:57
add a comment |
2
2
2
There is no place in your code that could raise a MyCustomError exception, so there is nothing to rescue from. The only exception that could possibly be raised by that code is a ZeroDivisionError.
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
There is no place in your code that could raise a MyCustomError exception, so there is nothing to rescue from. The only exception that could possibly be raised by that code is a ZeroDivisionError.
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
answered Nov 16 '18 at 14:47
Jörg W MittagJörg W Mittag
294k63359557
294k63359557
It might be worth noting thatZeroDivisionErrorinherits fromStandardErrorwhich is whyrescue StandardErrorrescues it.
– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raiseZeroDivisionError.ZeroDivisionErroris aStandardErrorso.do_standardrescues it.ZeroDivisionErroris not aMyCustomerrorand so.do_customdoes not rescue it.
– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:MyCustomerrorinherits fromStandardError. In the class hierarchy,MyCustomerrorandZeroDivisionErrorare siblings.
– Stefan
Nov 17 '18 at 13:57
add a comment |
It might be worth noting thatZeroDivisionErrorinherits fromStandardErrorwhich is whyrescue StandardErrorrescues it.
– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raiseZeroDivisionError.ZeroDivisionErroris aStandardErrorso.do_standardrescues it.ZeroDivisionErroris not aMyCustomerrorand so.do_customdoes not rescue it.
– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:MyCustomerrorinherits fromStandardError. In the class hierarchy,MyCustomerrorandZeroDivisionErrorare siblings.
– Stefan
Nov 17 '18 at 13:57
It might be worth noting that
ZeroDivisionError inherits from StandardError which is why rescue StandardError rescues it.– Stefan
Nov 16 '18 at 16:45
It might be worth noting that
ZeroDivisionError inherits from StandardError which is why rescue StandardError rescues it.– Stefan
Nov 16 '18 at 16:45
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
Place or not place. It does not explain why in case call method do_standard is caught by StandardError, instead in case call do_custom not.
– user3471671
Nov 16 '18 at 19:04
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
@Stefan In the above example MyCustomerror is also inherited by StandardError!
– user3471671
Nov 16 '18 at 19:07
Both functions raise
ZeroDivisionError. ZeroDivisionError is a StandardError so .do_standard rescues it. ZeroDivisionError is not a MyCustomerror and so .do_custom does not rescue it.– David Maze
Nov 17 '18 at 2:41
Both functions raise
ZeroDivisionError. ZeroDivisionError is a StandardError so .do_standard rescues it. ZeroDivisionError is not a MyCustomerror and so .do_custom does not rescue it.– David Maze
Nov 17 '18 at 2:41
@user3471671 it's the other way round:
MyCustomerror inherits from StandardError. In the class hierarchy, MyCustomerror and ZeroDivisionError are siblings.– Stefan
Nov 17 '18 at 13:57
@user3471671 it's the other way round:
MyCustomerror inherits from StandardError. In the class hierarchy, MyCustomerror and ZeroDivisionError are siblings.– Stefan
Nov 17 '18 at 13:57
add a comment |
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rescue MyCustomerrorrescuesMyCustomerrorand its subclasses. ButZeroDivisionErrorisn't one of its subclasses.– Stefan
Nov 16 '18 at 16:35