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Dogs have many shared characteristics, like the abilities to wag their tails and drink water from a bowl, but they also have information about them th 阅读全文
posted @ 2016-05-01 14:16
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map is another extremely useful Ruby iterator. It helps us map data from one form to another. It will return a new Array containing the result of runn 阅读全文
posted @ 2016-04-30 17:30
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While Ruby’s each method is useful, it also comes with an awesome extended family of methods that are even more powerful! For the next few examples, w 阅读全文
posted @ 2016-04-30 17:22
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Rather than using Strings as the keys in a Hash, it’s better practice to use Symbols. Symbols are just like Strings except they’re faster and take up 阅读全文
posted @ 2016-04-30 14:35
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http://ruby-doc.org/core-2.2.0/Array.html#method-i-compact compact → new_aryclick to toggle source Returns a copy of self with all nil elements remove 阅读全文
posted @ 2016-04-25 17:48
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http://docs.ruby-lang.org/en/2.0.0/Hash.html 阅读全文
posted @ 2016-04-25 17:43
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Select2 插件官网：https://select2.github.io/ Select2 初始化说明： 代码在 public/javascripts/subchannel_items.js 中的 $("#subchannel_item_showable_id").select2 行。 sele 阅读全文
posted @ 2016-04-25 10:43
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- validates :name, presence: true, uniqueness: { conditions: -> { where(:state.ne => 2) } }, length: { maximum: 9 } + validates :name, presence: true, length: { maximum: 9 } validates :name, pre... 阅读全文
posted @ 2016-04-25 10:31
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# -*- encoding : utf-8 -*- class InterfaceBaseController = '2.1.0' elsif ua == '111' '1.8.0' if version >= '1.1.1' end @version ||= version ... 阅读全文
posted @ 2016-04-21 19:32
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Mysql2::Error: Cannot delete or update a parent row: a foreign key constraint fails (`todo_list_development`.`todo_items`, CONSTRAINT `fk_rails_d913ce 阅读全文
posted @ 2016-04-19 09:51
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