大约有 47,000 项符合查询结果（耗时：0.0506秒） [XML]
Run a single migration file
...iveRecord::Migration
def change
add_column :products, :part_number, :string
end
end
You can create an instance of the migration and run migrate(:up) or migrate(:down) on an instance, like this:
$ rails console
>> require "db/migrate/20090408054532_add_part_number_to_products.rb"
>...
From an array of objects, extract value of a property as array
... the value of a property in an object.
Additionally, _.map() now allows a string to be passed in as the second parameter, which is passed into _.property(). As a result, the following two lines are equivalent to the code sample above from pre-Lodash 4.
var result = _.map(objArray, 'foo');
var resu...
Sequelize.js: how to use migrations and sync
...uelize init
...
sequelize model:create --name User --attributes first_name:string,last_name:string,bio:text
This will create both model AND migration. Then, manually merge your existing models with generated with sequelize-cli, and do the same with migrations. After doing this, wipe database (if p...
How to correctly save instance state of Fragments in back stack?
... To help save time for others, App.VSTUP and App.STAV are both string tags that represent the objects they are trying to obtain. Example: savedState = savedInstanceState.getBundle(savedGamePlayString); or savedState.getDouble("averageTime")
– Tanner Hallman
...
Hidden Features of Java
...le to have an "OR" there instead of the &?
– mainstringargs
Jun 16 '09 at 18:37
9
@Grasper: N...
How to get a key in a JavaScript object by its value?
...
I think Converting it to a string would be better to fix type errors just add .toString() like obj[ key ].toString() and to the value if desired...
– CrandellWS
Jan 6 '15 at 20:19
...
How do I intercept a method call in C#?
...I understand it, this is what you want to do:
[Log()]
public void Method1(String name, Int32 value);
and in order to do that you have two main options
Inherit your class from MarshalByRefObject or ContextBoundObject and define an attribute which inherits from IMessageSink. This article has a go...
What does SynchronizationContext do?
...t, in a Winforms app:
ThreadPool.QueueUserWorkItem(delegate {
string text = File.ReadAllText(@"c:\temp\log.txt");
myTextBox.BeginInvoke(new Action(() => {
myTextBox.Text = text;
}));
});
Which has the advantage that it works when called from any thre...
Which is faster : if (bool) or if(int)?
...ro values. To the CPU, usually, everything is one of the scalar types or a string of them.
A given compiler and a given ABI will need to choose specific sizes for int and bool and when, like in your case, these are different sizes they may generate slightly different code, and at some levels of op...
RESTful URL design for search
...
For the searching, use querystrings. This is perfectly RESTful:
/cars?color=blue&type=sedan&doors=4
An advantage to regular querystrings is that they are standard and widely understood and that they can be generated from form-get.
...