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Ruby: Round Down with some decimal places
Memorized the way to round down number to the nth decimal places in Ruby.
The number like 0.81235 (Float) has function floor, which round down the number to zeal number, can’t round down to some decimal places.
Environment
- Ruby 2.2.3p173
- OS: Ubuntu 15.04
Higashiginza Nagahama Ramen Yamachan
I ate Nagahama Ramen for 700 yen, at Hogashiginza Yamachan. Nagahama is the name of place in Chuo-ku, Fukuoka city, Fukuoka prefecture.
It’s just north from Kabukiza. The shop has wood door, good fashion.
System
Buy tickets at the vending machine. 券売機がありますが、店員さんも近くにいます。
ランチは替え玉またはライスが無料でつけられます。
Menu
Most reasonable menu is Nagahama Ramen, 700 yen.
You can choose your favorite firmness of noodle.
辛子高菜、ごま、紅生姜は入れ放題です。
本場の味がすると評判の 豚骨ラーメン もあります。
Location
The nearest station is Higashi Ginza. You can walk from Giza, Shintomicho and Tsukiji station. 築地市場、銀座一丁目からだと少し遠く感じます。
SVG Default User Icon
Exceptions I Bumped into on Upgrading from Cells 3 to Cells 4
Here are some exceptions I bumped into on upgrading from Cells 3 gem to Cells 4. ここにある対処法は、 それぞれの Cell クラス に対して行ってもいいですが、 it is easier to create the parent class, ApplicationCell.
対処した最終結果は Rails: Cells 3 から Cells 4 へのアップグレード に記載しています。
Exception: undefined method helper_method
The following error was raised in lib/devise/controllers/helpers.rb. The version of device gem I used at that time was 3.5.2.
undefined method `helper_method’ for XyzCell:Class
Add the following code to Cell class.
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def self.helper_method(*) end |
It is empty method but there’s no problem. With Cells 3, we have to call self.helper_method but with Cells 4 we don’t have to do that and its method was removed.
Reference: apotonick/cells Issue Not working with react-rails
Exception in dom_class
The following exception may occur.
undefined method `dom_class’ for #<XyzCell:0x007ff36d4fecb0>
Add the following code to Cell class.
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1 2 3 4 5 6 7 |
def dom_class(record, prefix = nil) ActionView::RecordIdentifier.dom_class(record, prefix) end def dom_id(record, prefix = nil) ActionView::RecordIdentifier.dom_id(record, prefix) end |
Reference: apotonick/cells Troubleshooting
Exception concerns number_with_delimiter is raised
Add include ActionView::Helpers::NumberHelper to Cell class.
Exception because of select tag can’t be used
The following message will be shown.
private method `select’ called for #<XyzCell:0x007ff48f4febe8>
Add include ActionView::Helpers::FormOptionsHelper to Cell class.
Reference: apotonick/cells Issue select form_helper doesn’t work in cells 4