Observed on Rails 2.3 and machinist 1.0.6 Like the title says, when you define the method empty? like in the following example, you may not longer use collection.make.

...has_many :pages def empty? pages.empty? end end Assuming b1 = Book.find(1) b2 = Book.find(2) instead of expected b1.pages.make #=> #<Page id: 1, book_id: 1> b2.pages.make #=> #<Page id: 2, book...

...a vertical output. You know this: mysql> SELECT * FROM users; +----+---------+---------------------+-----------------+ | id | name | email | greeting | +----+---------+---------------------+-----------------+ | 1 | Alice | alice@example.com | Hello world! | | 2 | Bob | bob@example.com | Hello universe! | | 3 | Charlie | charlie@example.com | Hi mom...

This is how it looks like vertically: mysql> SELECT * FROM users \G *************************** 1. row *************************** id: 1 name: Alice email: alice@example.com greeting: Hello world! *************************** 2. row *************************** id: 2

...say you want to merge the properties of two JavaScript objects: let a = { foo: 1, bar: 2 } let b = { bar: 3, baz: 4 } let merged = merge(a, b) // => { foo: 1...

...you could then test it like this: get :index persisted_session[:page_views].should == 1 # session[:page_views] is 1, so that would still work get :index persisted_session[:page...

...views].should == 2 # session[:page_views] would be 1, even though it works in the real world

...of objects, uniq does not work as expected, since it uses strict equality. So [[1], [1]].uniq() == [[1], [1]] In some cases, this might be a workaround: [[1], [1]].invoke...

...toJSON").uniq().invoke("evalJSON")

...total is either memoized itself, or using some # private memoized method subject.seat_counts = [5, 1] subject.seat_total.reload.should == 6 # => Still 5 end You might be tempted to manually unmemoize any memoized internal...

...fiddling with internal state. When writing tests, stay on your chosen abstraction level. Solution 1 record.unmemoize_all Solution 2 Perform a full reload by re-finding your record:

...this problem when you update your FreeBSD Ports: ===>>> Launching child to update ruby19-iconv-1.9.3.547,1 to ruby20-iconv-2.0.0.576,1 ===>>> All >> ruby19-iconv-1.9.3.547,1 (17/17) ===>>> Currently installed version...

...ruby19-iconv-1.9.3.547,1 ===>>> Port directory: /usr/ports/converters/ruby-iconv ===>>> This port is marked IGNORE ===>>> Not needed with Ruby 2.0 or newer ===>>> If you are sure you can build it, remove the IGNORE...

...occurs in sliders with HTML content. The issue When a slider contains a composited[1] element, the element will overlap any other element when sliding, being rendered as frontmost element...

...or fully, e.g. by using z-index) B is rendered in its own layer[1] C is moved with a CSS transition the transition moves A and B in from...

...array for e.g. one level, it takes an optional argument. # Flattens the array recursively >> [1, [2, [3]]].flatten => [1, 2, 3] # Flattens the array the given number of times

...bin/spring stop pkill -f spring To prevent Spring from starting again: export DISABLE_SPRING=1

...sed -E 's/:[0-9]+: .*//'`" line_number="`echo $line | sed -E 's/.*:([0-9]+).*/\1/'`" else file="`echo $line | sed -r 's/:[0-9]+: .*//'`" line_number="`echo $line | sed -r...

...s/.*:([0-9]+).*/\1/'`" fi # since $file in working directory isn't always equal to $file in index, # we backup it; thereby we can add our whitespace fixes without accidently...

...some CSS selectors: function floatIn($element) { $element.css({ 'opacity': 0, 'margin-top': 200px }); $element.animate({ 'opacity': 1, 'margin-top': 0 }, { duration: 500 }); } The animation is implemented using setInterval and Javascript. This works...

...as smooth as a CSS transition. Fortunately the animate API can be mapped almost 1:1 to CSS transitions. There are libraries like Transit that act as a drop-in...

...used anywhere inside the Rake tasks. See #Resources at the bottom for examples. Step 1: Upgrade guide For migration from 2 to 3, follow this tutorial: Capistrano 3 Upgrade Guide...

Use the new syntax instead: set :ssh_options, {...

wrong number of arguments (1 for 2) undefined method `tail' for nil:NilClass You need to wrap your task body...

ls -1tr * | tail -1 Used switches The -1 switch makes ls return 1 file per line, -t orders by modification time and -r causes sorting from oldest to...

...you care about performance, never use a query like UPDATE users SET has_message = 1 WHERE users.id IN (SELECT user_id FROM messages) MySQL does not optimize this and seems...

UPDATE users INNER JOIN messages ON messages.user_id = users.id SET has_message = 1 or pipe it through ruby with something like user_ids = ActiveRecord::Base.connection.select_values(Message.select(:user...

Boot partitions from installations prior to the 16.04 era are terribly small. When you install updates and encounter errors due to a full /boot partition, consider risizing it.

...the steps described below, ask someone experienced to help you out. This has worked 100% so far. 1 out of 1 tries. ;) Scenario A: There is unassigned space on your...

...increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +-------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------------+----------+----------------+---------+ | test1 | MyISAM | 10 | Dynamic | 3 | 121...

...NULL | utf8_general_ci | NULL | | | | attachments | InnoDB | 10 | Compact | 0 | 0 | 16384 | 0 | 16384 | 3145728 | 1 | 2011-08-17 13:46:48 | NULL | NULL | utf8_general_ci | NULL | | | +-------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------------+----------+----------------+---------+

uri = URI('http://example.com/?foo=1&bar=2') stub_request(:get, 'example.com').with(query: {foo: 1, bar: 2}) Net::HTTP.get(uri) # ===> Success If you only want to check if foo is...

...uri = URI('http://example.com/?foo=1&bar=2') stub_request(:get, 'example.com').with(query: hash_including(foo: 1)) Net::HTTP.get(uri) # ===> Error hash_including doesn't parse query values to string, you need...

Use the PDF toolkit: sudo apt-get install pdftk To rotate page 1 by 90 degrees clockwise: pdftk in.pdf cat 1E output out.pdf # old pdftk pdftk in.pdf cat 1east output...

...out.pdf # new pdftk To rotate all pages clockwise: pdftk in.pdf cat 1-endE output out.pdf # old pdftk pdftk in.pdf cat 1-endeast output out.pdf # new pdftk The E (old pdftk...

...Let's say you have this $scope in your Angular controller: $scope.tasks = [ { 'text': 'Task 1' }, { 'text': 'Task 2' } ] And you have this template: {{task.text}} Which renders this HTML:

...bound to the second you can say this in jQuery: var li = $('li:eq(1)'); li.scope().node // => { 'text': 'Task 2' } Or if you'd like to access the entire list...

...query of three random words from the same vocabulary. I used sample sizes from 1,000 to 100,000 records, meaning 50,000 to 5,000,000 indexed words.

...more efficient than I thought For a medium-sized data set of up to 10,000 records (500,000 words) or so, LIKE only takes a fraction of a second...

...helpful when watching them but, since they are ANSI color codes like ^[[4;36;1m, can be annoying when you are reading the logs with a tool that does just...

Remove them with sed: cat staging.log | sed -r "s/\x1B\[([0-9]{1,3}((;[0-9]{1,3})*)?)?[m|K]//g" This will print the log without colors...

position: absolute; top: 0; bottom: 0; } .section::before { left: calc(50% - 50vw); right: 100%; } .section::after { left: 100%; right: calc(50% - 50vw); } Here is how we place the ::before...

...the viewport width and end up at the very left of the window. right: 100% means that the right side of ::before ends at the left of .section.