我有一个包含ActiveModel的过滤器类,它包含两个日期:
class MealFilter
include ActiveModel::Model
attribute :day_from, Date
attribute :day_to, Date
end
该模型呈现为如下形式:
<%= form_for(@filter) do |f| %>
<div class="form-group form-group--date">
<%= f.label :day_from %>
<%= f.date_select :day_from %>
</div>
<div class="form-group form-group--date">
<%= f.label :day_to %>
<%= f.date_select :day_to %>
</div>
<% end %>
现在的问题是,提交表单后,它会将此参数发送到控制器:
{"utf8"=>"✓", "meal_filter"=>{"day_from(1i)"=>"2016", "day_from(2i)"=>"1", "day_from(3i)"=>"29", "day_to(1i)"=>"2016", "day_to(2i)"=>"1", "day_to(3i)"=>"30"}, "commit"=>"Filter"}
我通过控制器参数提取值:
def meal_filter_params
if params.has_key? :meal_filter
params.require(:meal_filter).permit(:day_from, :day_to)
end
end
如果现在使用params[:meal_filter]
将MealFilter
分配给我的@filter = MealFilter.new(meal_filter_params)
类,则我的日期字段未正确更新。它表明1i,2i,3i部分未正确分配给日期。
但是,如果使用ActiveRecord
类,则可以正常工作。
我想念一些包括吗?有谁知道,如果没有在ActiveModel::Model
中执行此魔术映射,则在哪里实现?
据我所知,有一个开放拉取请求(https://github.com/rails/rails/pull/8189)应该可以解决此问题。
但是与此同时,一些聪明的人写了一个可以包含在模型中的模块:https://gist.github.com/mhuggins/6c3d343fd800cf88f28e
[您需要做的就是包括关注点并定义一个class_for_attribute
方法,该方法返回应将属性映射到的类-在我的情况下是Date
。
class DateOfBirth
include ActiveModel::Model
include ActiveModel::Attributes
include ActiveModel::Validations::Callbacks
attribute :date_of_birth, :date
attribute "date_of_birth(3i)", :string
attribute "date_of_birth(2i)", :string
attribute "date_of_birth(1i)", :string
before_validation :make_a_date
validates :date_of_birth, presence: { message: "You need to enter your date of birth" }
def make_a_date
year = self.send("date_of_birth(1i)").to_i
month = self.send("date_of_birth(2i)").to_i
day = self.send("date_of_birth(3i)").to_i
begin # catch invalid dates, e.g. 31 Feb
self.date_of_birth = Date.new(year, month, day)
rescue ArgumentError
return
end
end
end