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Check if a table exists in Rails
...? 'kittens'
In Rails 2, 3 & 4 the API is about tables.
# Listing of all tables and views
ActiveRecord::Base.connection.tables
# Checks for existence of kittens table/view (Kitten model)
ActiveRecord::Base.connection.table_exists? 'kittens'
Getting the status of migrations:
# Tells you all...
Is it valid to define functions in JSON results?
...t further data, without the client worrying about which REST or so api to call next.
– Ravindranath Akila
Jun 24 '14 at 7:48
3
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How to Set Opacity (Alpha) for View in Android
...ton (or any other view) in your xml:
android:color="#66FF0000" // Partially transparent red
In the above example, the color would be a partially transparent red.
When defining the color of a view, the format can be either #RRGGBB or #AARRGGBB, where AA is the hex alpha value. FF would be full...
jQuery: more than one handler for same event
...
Both handlers will run, the jQuery event model allows multiple handlers on one element, therefore a later handler does not override an older handler.
The handlers will execute in the order in which they were bound.
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How do I check if a given string is a legal/valid file name under Windows?
...than ASCII space)
Any other character that the target file system does not allow (say, trailing periods or spaces)
Any of the DOS names: CON, PRN, AUX, NUL, COM0, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT0, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9 (and avoid AUX.txt, etc)...
Why shouldn't all functions be async by default?
...kind words. It is indeed an awesome feature and I am glad to have been a small part of it.
If all my code is slowly turning async, why not just make it all async by default?
Well, you're exaggerating; all your code isn't turning async. When you add two "plain" integers together, you're not awa...
Rails 4 - passing variable to partial
...
From the Rails api on PartialRender:
Rendering the default case
If you're not going to be using any of the options like collections or layouts, you can also use the short-hand defaults of render to render partials.
Examples:
# I...
Java and SQLite [closed]
... which uses embedded native SQLite libraries on Windows, Linux, OS X, and falls back to pure Java implementation on other OSes: https://github.com/xerial/sqlite-jdbc (formerly zentus)
Another Java - SWIG wrapper. It only works on Win32. http://rodolfo_3.tripod.com/index.html
sqlite-java-shell: 100% ...
Rails DB Migration - How To Drop a Table?
...tp://api.rubyonrails.org/classes/ActiveRecord/Migration.html
More specifically, you can see how to drop a table using the following approach:
drop_table :table_name
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QuotaExceededError: Dom exception 22: An attempt was made to add something to storage that exceeded
...ode browsing. While in private browsing, local storage is not available at all.
One solution is to warn the user that the app needs non-private mode to work.
UPDATE: This has been fixed in Safari 11, so the behaviour is now aligned with other browsers.
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