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Rails 3 check if attribute changed
...n the model and check for changed? before you save it. ie. @model.field = 'foo' or @model.attributes = @model.attributes.merge(params[:model])
– Grzegorz
Nov 23 '17 at 6:44
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Go build: “Cannot find package” (even though GOPATH is set)
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It does not work because your foobar.go source file is not in a directory called foobar. go build and go install try to match directories, not source files.
Set $GOPATH to a valid directory, e.g. export GOPATH="$HOME/go"
Move foobar.go to $GOPATH/src/fo...
module.exports vs exports in Node.js
...the same since you are not reassigning it. That is why this works
exports.foo = function() { ... }
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Is there a recommended format for multi-line imports?
...nthesis notation is the ability to import multiple modules like this: from foo import (bar, baz). PEP 328 says nothing about formatting.
– Max Malysh
Aug 2 '18 at 12:20
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sqlalchemy flush() and get inserted id?
...s):
session.refresh()
So, your code would look something like this:
f = Foo(bar=x)
session.add(f)
session.flush()
# At this point, the object f has been pushed to the DB,
# and has been automatically assigned a unique primary key id
f.id
# is None
session.refresh(f)
# refresh updates given obj...
Capturing Groups From a Grep RegEx
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yeah, very help, e.g. echo 'r123456 foo 2016-03-17' | pcregrep -o1 'r([0-9]+)' 123456
– zhuguowei
Mar 17 '16 at 13:18
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Finding the path of the program that will execute from the command line in Windows
.../en-us/sysinternals/bb896656). From the command-line, just run listdlls -d foo.dll to see all processes that have the module loaded and the full path to the loaded module. Alternatively, you can just do a Windows file search for the file name.
– Chris Schmich
N...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
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@ChrisMiddleton: A method void UseCar(Car &foo); cannot be expected to include disambiguation between ToyotaCar::Drive and HybridCar::Drive (since it should often neither know nor care that those other types even exist). A language could, as C++ does, require that co...
What exactly do “u” and “r” string flags do, and what are raw string literals?
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Note that ru"C:\foo\unstable" will fail because \u is a unicode escape sequence in ru mode. r mode does not have \u.
– Curtis Yallop
Jun 9 '14 at 16:08
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Is the practice of returning a C++ reference variable evil?
...t, eg, operator<<: that must return a reference, or
cout << "foo" << "bar" << "bletch" << endl ;
won't work.
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