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Renaming table in rails
...ou would typically do this sort of thing in a migration:
class RenameFoo < ActiveRecord::Migration
def self.up
rename_table :foo, :bar
end
def self.down
rename_table :bar, :foo
end
end
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Usage of EnsureSuccessStatusCode and handling of HttpRequestException it throws
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Note, the default HttpRequestException thrown by EnsureSuccessStatusCode() will have the reason phrase. But you could access that property anyway in the response if it is not successful.
– Stefan Zvonar
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Proper Repository Pattern Design in PHP?
...plitting a large entity into two smaller entities, etc.)
Consider having multiple versions of entities. You can have a User for the back end and maybe a UserSmall for AJAX calls. One might have 10 properties and one has 3 properties.
The downsides of working with ad-hoc queries:
You end up with ...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...s trivial examples (that really was the spirit of the original question), although I admit several of these are over my head... are the terms "necessity" and "possibility" precisely defined in logic? how do they translate to their computational equivalents?
– Tom Crockett
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What is a bank conflict? (Doing Cuda/OpenCL programming)
...ray of integers and our DRAM or memory system has 512 banks in it. By default the array data will be layout in a way that arr[0][0] goes to bank 0, arr[0][1] goes to bank 1, arr[0][2] to bank 2 ....arr[0][511] goes to bank 511. To generalize arr[x][y] occupies bank number y. Now some code (as shown ...
How do I check in JavaScript if a value exists at a certain array index?
...r a positive integer), you literally just use
if (i >= 0 && i < array.length) {
// it is in array
}
Now, under the hood, JavaScript engines almost certainly won't allocate array space linearly and contiguously like this, as it wouldn't make much sense in a dynamic language and it ...
Make a Bash alias that takes a parameter?
...as. You need to either close and reopen your shell, or else call unalias <name>. Perhaps I'll save someone the 5 minutes I just wasted.
– Marty Neal
May 21 '14 at 17:25
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What is a thread exit code?
... zero value indicates success, while a non zero value indicates failure. Although, you can attempt to return any integer value as an exit code, only the lowest byte of the integer is returned from your process or thread as part of an exit code. The higher order bytes are used by the operating syst...
Why does Dijkstra's algorithm use decrease-key?
...reduces to O( m log n ), but in a graph where two nodes may be joined by multiple edges of different weights, m is unbounded ( of course, we can claim that the minimum path between two nodes only uses minimal edges, and reduce this to a normal graph, but for the nonce, it's interesting).
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How to create dictionary and add key–value pairs dynamically?
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var dict = {};
// this obviously won't work
dict.some invalid key (for multiple reasons) = "value1";
// but this will
dict["some invalid key (for multiple reasons)"] = "value1";
You also want bracket notation if your keys are dynamic:
dict[firstName + " " + lastName] = "some value";
Note tha...