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How do I make a column unique and index it in a Ruby on Rails migration?
...
If you are creating a new table, you can use the inline shortcut:
def change
create_table :posts do |t|
t.string :title, null: false, index: { unique: true }
t.timestamps
end
end
...
How does the @property decorator work in Python?
...rty object at 0x10ff07998>
These act as decorators too. They return a new property object:
>>> property().getter(None)
<property object at 0x10ff079f0>
that is a copy of the old object, but with one of the functions replaced.
Remember, that the @decorator syntax is just synta...
I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
... There's no mention of using PG in the question. Recommending a new database system is not much help...
– Ger
Nov 5 '15 at 21:07
1
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Read text file into string array (and write)
... there is a bufio.Scanner API that can easily read lines from a file. Consider the following example from above, rewritten with Scanner:
package main
import (
"bufio"
"fmt"
"log"
"os"
)
// readLines reads a whole file into memory
// and returns a slice of its lines.
func readLine...
Get/pick an image from Android's built-in Gallery app programmatically
...;
findViewById(R.id.Button01)
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// in onCreate or any event where your want the user to
// select a file
I...
Generate colors between red and green for a power meter?
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+1; I was going to ask a new question about how to improve a color algorithm i have for coloring a bar chart in HTML/PHP... SO suggested this question as similar and your answer helped me fix the issue without having to ask the question! Thanks!
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Importing a Maven project into Eclipse from Git
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Yes this definitely works, but the newer m2 has finally got nice integration with git and svn. As others have noted, EGit 1.0.0, m2e 1.0 and m2e-egit 0.13 will give you git -> materialize mvn project to eclipse in one step.
– thetoolm...
SQL Server : Columns to Rows
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Just to help new readers, I've created an example to better understand @bluefeet's answer about UNPIVOT.
SELECT id
,entityId
,indicatorname
,indicatorvalue
FROM (VALUES
(1, 1, 'Value of Indicator 1 for ...
What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
...access some value using the value[:key] syntax.
Please note that Array.new["key"] will raise a TypeError.
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What does the servlet value signify
... the post.
– Alboz
Feb 18 '15 at 17:51
3
What happens when load on startup is not specified?
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