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How can I rename a database column in a Ruby on Rails migration?
...a column, Rails 4 generates a change method instead of up and down as mentioned in the above section. The generated change method is:
$ > rails g migration ChangeColumnName
which will create a migration file similar to:
class ChangeColumnName < ActiveRecord::Migration
def change
ren...
One-liner to take some properties from object in ES 6
How one can write a function, which takes only few attributes in most-compact way in ES6?
11 Answers
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How to pull a random record using Django's ORM?
...ent on my site. On the main webpage I'd like to show some of them: newest, one that was not visited for most time, most popular one and a random one.
...
Signed to unsigned conversion in C - is it always safe?
...e type of the operand with signed integer type.
In your case, we have one unsigned int (u) and signed int (i). Referring to (3) above, since both operands have the same rank, your i will need to be converted to an unsigned integer.
6.3.1.3 Signed and unsigned integers
When a value w...
Is it possible to change a UIButtons background color?
This one has me stumped.
16 Answers
16
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Are GUID collisions possible?
...
Basically, no. I think someone went mucking with your database. Depending on the version GUID you're using the value is either unique (for things like version 1 GUIDs), or both unique and unpredictable (for things like version 4 GUIDs). SQL Server's ...
T-SQL: Deleting all duplicate rows but keeping one [duplicate]
...lightly different data but I do not care about that. I still need to keep one of these rows however. SELECT DISTINCT won't work because it operates on all columns and I need to suppress duplicates based on the key columns.
...
How to check in Javascript if one element is contained within another
How can I check if one DOM element is a child of another DOM element? Are there any built in methods for this? For example, something like:
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What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
...e normally prototypically inherits from its parent scope, but not always. One exception to this rule is a directive with scope: { ... } -- this creates an "isolate" scope that does not prototypically inherit. This construct is often used when creating a "reusable component" directive.
As for the ...
Getters \ setters for dummies
...d first and last will be updated and vice versa.
n = new Name('Claude', 'Monet')
n.first # "Claude"
n.last # "Monet"
n.fullName # "Claude Monet"
n.fullName = "Gustav Klimt"
n.first # "Gustav"
n.last # "Klimt"
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