大约有 40,000 项符合查询结果（耗时：0.0807秒） [XML]
Deleting all records in a database table
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Prefer select whenever you need to use an if expression inside a block, this way you avoid having to chain the compact method to remove nil elements.
– Sebastian Palma
Jan 18 '18 at 17:18
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Setting up a common nuget packages folder for all solutions when some projects are included in multi
...t-Click on your "NuGet" solution folder and then Add->Existing Item and select \Solutions\NuGet.Config.
The reason we are doing this is so that it is visible in the solution and should help with making sure it is properly committed to your source code control. You may want to do this step for ea...
How to display the current year in a Django template?
...ration year dropdown with 20 values (starting with the current year). The select values needed to be 2 digits and the display strings 4 digits. To avoid complex template code, I wrote this simple template tag:
@register.filter
def add_current_year(int_value, digits=4):
if digits == 2:
...
Removing all empty elements from a hash / YAML?
...mplementation is not recursive. As a curiosity, they implemented it using #select instead of #delete_if for performance reasons. See here for the benchmark.
In case you want to backport it to your Rails 3 app:
# config/initializers/rails4_backports.rb
class Hash
# as implemented in Rails 4
# ...
Is there a way to get a collection of all the Models in your Rails app?
....
EDIT: Just for fun, I found a way to list all classes
Module.constants.select { |c| (eval c).is_a? Class }
EDIT: Finally succeeded in listing all models without looking at directories
Module.constants.select do |constant_name|
constant = eval constant_name
if not constant.nil? and constan...
How do i create an InstallShield LE project to install a windows service?
...after installation. To install service and start it, in solution explorer, select 3. Configure Target System > Services.
– Rajeev
Feb 17 '15 at 13:28
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How to get a dependency tree for an artifact?
...ent version of m2eclipse (which you should if you use eclipse and maven):
Select the menu entry
Navigate -> Open Maven POM
and enter the artifact you are looking for.
The pom will open in the pom editor, from which you can select the tab Dependency Hierarchy to view the dependency hierarchy (...
How to pass an array within a query string?
...)
Form Examples
On a form, multi-valued fields could take the form of a select box set to multiple:
<form>
<select multiple="multiple" name="cars[]">
<option>Volvo</option>
<option>Saab</option>
<option>Mercedes</option...
How to format code in Xcode? [duplicate]
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Select first the text you want to format and then press Ctrl+I.
Use Cmd+A first if you wish to format all text in the selected file.
Note: this procedure only re-indents the lines, it does not do any advanced formatting.
In ...
Android custom dropdown/popup menu
... android:paddingEnd="10dip">
<ImageView
android:id="@+id/shoe_select_icon"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:scaleType="fitXY" />
<TextView
android:id="@+id/shoe_select_text"
android:l...