http://guides.rubyonrails.org/migrations.html
- add_column
- add_index
- change_column
- change_table
- create_table
- drop_table
http://guides.rubyonrails.org/migrations.html
Originally published in June 2008
When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.
To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.
Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.
# delete local tag '12345' | |
git tag -d 12345 | |
# delete remote tag '12345' (eg, GitHub version too) | |
git push origin :refs/tags/12345 | |
# alternative approach | |
git push --delete origin tagName | |
git tag -d tagName |
Patch mode allows you to stage parts of a changed file, instead of the entire file. This allows you to make concise, well-crafted commits that make for an easier to read history. This feature can improve the quality of the commits. It also makes it easy to remove parts of the changes in a file that were only there for debugging purposes - prior to the commit without having to go back to the editor.
It allows you to see the changes (delta) to the code that you are trying to add, and lets you add them (or not) separately from each other using an interactive prompt. Here's how to use it:
from the command line, either use
module ActiveRecord | |
module RailsAdminEnum | |
def enum(definitions) | |
super | |
definitions.each do |name, values| | |
define_method("#{ name }_enum") { self.class.send(name.to_s.pluralize).to_a } | |
define_method("#{ name }=") do |value| | |
if value.kind_of?(String) and value.to_i.to_s == value |
A common task when developing iOS apps is to register custom cell subclasses for both UITableView
and UICollectionView
. Well, that is if you don’t use Storyboards, of course.
Both UITableView
and UICollectionView
offer a similar API to register custom cell classes:
public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)
# spec/support/request_helpers.rb
module Requests
module JsonHelpers
def json
JSON.parse(response.body)
end
end
end
If you get error like this:
Running via Spring preloader in process 7662
/Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require': dlopen(/Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib (LoadError)
Referenced from: /Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle
Reason: image not found - /Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle
from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require'
"use strict"; | |
/** | |
* Hypertext Transfer Protocol (HTTP) response status codes. | |
* @see {@link https://en.wikipedia.org/wiki/List_of_HTTP_status_codes} | |
*/ | |
enum HttpStatusCode { | |
/** | |
* The server has received the request headers and the client should proceed to send the request body |