Ruby-on-rails 将用户输入转换为整数
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Convert User input to integer
提问by Robert
So I have a form where users can input a price. I'm trying to make a before_validation that normalizes the data, clipping the $ if the user puts it.
所以我有一个用户可以输入价格的表单。我正在尝试制作一个 before_validation 来规范化数据，如果用户放置它，则剪裁 $ 。
before_validation do
unless self.price.blank? then self.price= self.price.to_s.gsub(/\D/, '').to_i end
end
If user inputs $50 This code is giving me 0. If user inputs 50$ this code gives me 50. I think since the data type is integer that rails is running .to_i prior to my before_validation and clipping everything after the $. This same code works fine if the data type is a string.
如果用户输入 $50 这段代码给我 0。如果用户输入 50$ 这段代码给我 50。我认为因为数据类型是整数，所以 rails 在我的 before_validation 之前运行 .to_i 并剪裁 $ 之后的所有内容。如果数据类型是字符串，同样的代码也能正常工作。
Anyone have a solution that will let me keep the integer datatype?
任何人都有可以让我保留整数数据类型的解决方案？
回答by Ben Lee
One way is to override the mechanism on the model that sets the price, like this:
一种方法是覆盖模型上设置价格的机制，如下所示：
def price=(val)
write_attribute :price, val.to_s.gsub(/\D/, '').to_i
end
So when you do @model.price = whatever, it will go to this method instead of the rails default attribute writer. Then you can convert the number and use write_attributeto do the actual writing (you have to do it this way because the standard price=is now this method!).
所以当你这样做时@model.price = whatever，它会转到这个方法而不是 rails 默认属性 writer。然后你可以转换数字并使用write_attribute它来做实际的写作（你必须这样做，因为price=现在标准是这种方法！）。
I like this method best, but for reference another way to do it is in your controller before assigning it to the model. The parameter comes in as a string, but the model is converting that string to a number, so work with the parameter directly. Something like this (just adapt it to your controller code):
我最喜欢这种方法，但作为参考，另一种方法是在将其分配给模型之前在您的控制器中。参数以字符串形式出现，但模型正在将该字符串转换为数字，因此直接使用该参数。像这样的东西（只需使其适应您的控制器代码）：
def create
@model = Model.new(params[:model])
@model.price = params[:model][:price].gsub(/\D/, '').to_i
@model.save
end
For either solution, remove that before_validation.
对于任一解决方案，请删除该before_validation.
回答by offbyjuan
I would define a virtual attribute and do my manipulation there allowing you to format and modify both the getter and setter at will:
我会定义一个虚拟属性并在那里进行操作，允许您随意格式化和修改 getter 和 setter：
class Model < ActiveRecord::Base
def foo_price=(price)
self.price = price... #=> Mods to string here
end
def foo_price
"$#{price}"
end
You also might want to note that:
您可能还想注意：
".00".gsub(/\D/, '').to_i #=> 5000
回答by gilcierweb
My soluction colum price type decimal
我的解决方案列价格类型小数
t.decimal :price, precision: 12, scale: 6
# app/concern/sanitize_fields.rb
module SanitizeFields
extend ActiveSupport::Concern
def clear_decimal(field)
return (field.to_s.gsub(/[^\d]/, '').to_d / 100.to_d) unless field.blank?
end
def clear_integer(field)
field.to_s.strip.gsub(/[^\d]/, '') unless field.blank?
end
# module ClassMethods
# def filter(filtering_params)
# results = self.where(nil)
# filtering_params.each do |key, value|
# results = results.public_send(key, value) if value.present?
# end
# results
# end
#
# #use
# #def index
# # @products = Product.filter(params.slice(:status, :location, :starts_with))
# #end
#
# end
end
#app/controllers/products_controller.rb
include SanitizeFields
params[:product][:price] = clear_decimal(params[:product][:price])
