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How do I print out the contents of an object in Rails for easy debugging?
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I generally first try .inspect, if that doesn't give me what I want, I'll switch to .to_yaml.
class User
attr_accessor :name, :age
end
user = User.new
user.name = "John Smith"
user.age = 30
puts user.inspect
#=> #<User:0x423270c @name="John Smith", @age=...
MySQL SELECT only not null values
Is it possible to do a select statement that takes only NOT NULL values?
9 Answers
9
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How do I import .sql files into SQLite 3?
... answered Jan 12 '10 at 13:14
Dominic RodgerDominic Rodger
87.2k2828 gold badges185185 silver badges205205 bronze badges
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Do any JVM's JIT compilers generate code that uses vectorized floating point instructions?
...of my Java program really is some tight loops to compute a bunch of vector dot products. Yes I've profiled, yes it's the bottleneck, yes it's significant, yes that's just how the algorithm is, yes I've run Proguard to optimize the byte code, etc.
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How do I remove blank elements from an array?
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There are many ways to do this, one is reject
noEmptyCities = cities.reject { |c| c.empty? }
You can also use reject!, which will modify cities in place. It will either return cities as its return value if it rejected something, or nil if no rej...
How do I create a foreign key in SQL Server?
... A very important point to note that is creating the foreign key does not create an index. Joining another table to this one could result in an extremely slow query.
– Rocklan
Sep 5 '14 at 0:13
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Core Data: Quickest way to delete all instances of an entity
...ar")
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
do {
try myPersistentStoreCoordinator.execute(deleteRequest, with: myContext)
} catch let error as NSError {
// TODO: handle the error
}
Objective-C
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityN...
How to pick just one item from a generator?
...en in my answer, next(g). This will internally call g.__next__(), but you don't really have to worry about that, just as you usually don't care that len(a) internally calls a.__len__().
– Sven Marnach
Apr 10 '14 at 10:31
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How to remove selected commit log entries from a Git repository while keeping their changes?
...selected commit log entries from a linear commit tree, so that the entries do not show in the commit log.
9 Answers
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How do you write multiline strings in Go?
Does Go have anything similar to Python's multiline strings:
9 Answers
9
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