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Specifying column name in a “references” migration
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Do it manually:
add_column :post, :author_id, :integer
but now, when you create the belongs_to statement, you will have to modify it, so now you have to call
def post
belongs_to :user, :foreign_key => 'author_id'
end
...
CSS: center element within a element
... text-align:center;
background-color:blue;
height:400px;
width:600px;
}
.block {
height:100px;
width:200px;
text-align:left;
}
.center {
margin:auto;
background-color:green;
}
.left {
margin:auto auto auto 0;
background-color:red;
}
.right ...
What's the best way to set a single pixel in an HTML5 canvas?
...e a 1×1 image data, set the color, and putImageData at the location:
var id = myContext.createImageData(1,1); // only do this once per page
var d = id.data; // only do this once per page
d[0] = r;
d[1] = g;
d[2] = b;
d[3] = a;
myContext.putImageData( id, x, y ); ...
android edittext onchange listener
...ourClass extends Activity {
private EditText yourEditText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
yourEditText = (EditText) findViewById(R.id.yourEditTextId);
yourE...
StringLength vs MaxLength attributes ASP.NET MVC with Entity Framework EF Code First
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MaxLengthAttribute means Max. length of array or string data allowed
StringLengthAttribute means Min. and max. length of characters that are allowed in a data field
Visit http://joeylicc.wordpress.com/2013/06/20/asp-net-mvc-model-validation-u...
Why doesn't C have unsigned floats?
...ted as a regular float with compile-time checks to ensure that certain non-meaningful operations are never performed. The resulting machine code and performance could be identical, regardless of whether your floats are signed or not.
– xanderflood
Apr 12 '17 at...
How to obtain the last path segment of a URI
...I . how is it possible to get the last path segment (that in my case is an id)?
12 Answers
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How many spaces will Java String.trim() remove?
... I had to down-vote as this answer does not cover what the documentation means by "whitespace". It would seem logical that it would be where Chararacter.isWhitespace is true, but that is not what it means by "whitespace" ..
– user2864740
Nov 30 '13 at 9:17
...
jquery how to empty input field
...nput type="number" min="0' max="10" value="5"></input>? I guess said differently, are you allowed to set a numeric input to be blank?
– Kevin Wheeler
Jun 10 '15 at 21:49
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MongoDB - Update objects in a document's array (nested updating)
...o use the positional "$" operator. Something like:
db.bar.update( {user_id : 123456 , "items.item_name" : "my_item_two" } ,
{$inc : {"items.$.price" : 1} } ,
false ,
true);
Note that this will only increment the first matched subdocument in any...