Multiple Ensure Blocks

[Graham Jenkins]

I'm considering raising an RCR: "allow multiple ensure blocks". I've
searched for this to some extent - have I missed anything obvious?

I want to be able to write:

begin
raise 'something bad'
ensure
puts 1
ensure
puts 2
end

This is so I can reliably cleanup all request resources in my fcgi
scripts (rollback database connection, finish the request, cleanup
environment and session objects) without having to nest
begin...ensure...end blocks inside the only ensure block I'm allowed
to write.

I know that the Ruby Way is probably to nest separate blocks for each
of these resources

Database.use { |dbh|
Request.use { |req|
Session.use { |ses|
...
# my code here
}
}
}

but I end up nesting the real code about 10 layers deep if I do that.

 

[Jamis Buck]

I'm considering raising an RCR: "allow multiple ensure blocks". I've
searched for this to some extent - have I missed anything obvious?

I want to be able to write:

begin
raise 'something bad'
ensure
puts 1
ensure
puts 2
end

How does this differ from:

begin
raise 'something bad'
ensure
puts 1
puts 2
end

?

- Jamis

 

[Eric Hodel]

I know that the Ruby Way is probably to nest separate blocks for each
of these resources

Database.use { |dbh|
Request.use { |req|
Session.use { |ses|
...
# my code here
}
}
}

but I end up nesting the real code about 10 layers deep if I do that.

Make a wrapper:

class Session
def self.environment
Database.use do |dbh|
Request.use do |req|
Session.use do |ses|
yield dbh, req, ses
end
end
end
end
end

Session.environment do |dbh, req, ses|
end

 

[Gavin Sinclair]

How does this differ from:

begin
raise 'something bad'
ensure
puts 1
puts 2
end

?

If 'puts 1' throws an exception...

Gavin