hello, i am developing one application i want to set work date in which (day,month,year)any be blank. so how i do it? what i do in controller model rhtml. how i achieved it? i saw select date syntax but i haven't understand it?
Sunny, I had a similar requirement in which a date could be only partially known -- could be a full date (Oct 11, 1998), just a month (Oct 1998), or just a year (1998). I ended up creating a new class PartialDate which wrapped two attributes, the date, and the "mask", letting the mask represent the amount of specificity of the date (0 for the date represents a full date, 1 for only month and year, 2 for only year). Saving the date and making it work with ActiveRecord was a real challenge -- I ended up patching execute_callstack_for_multiparameter_attributes to break the date field into its two parts, say, "born_date" and "born_mask".
The born_date would always be a valid date (defaulting to the first of the month if mask was 1 and the first of the year if mask is 2).
<code> class ActiveRecord::Base class << self
def mask_attributes (*cols) self.send("attr", *cols) write_inheritable_array("attr_masked", cols + (masked_attributes
))
cols.each do |col| attr_protected((col.to_s + "_mask").to_sym) attr_protected((col.to_s + "_date").to_sym) class_eval <<-"EOL" def #{col.to_s} @#{col.to_s} ||= if #{col.to_s}_date PartialDate.new #{col.to_s}_date, #{col.to_s}_mask else nil end end def #{col.to_s}=(dt) if dt.nil? self.#{col.to_s}_date = nil self.#{col.to_s}_mask = nil else case dt when String @#{col.to_s} = PartialDate.new(dt) self.#{col.to_s}_date = @#{col.to_s}.date self.#{col.to_s}_mask = @#{col.to_s}.mask when PartialDate @#{col.to_s} = dt self.#{col.to_s}_date = dt.date self.#{col.to_s}_mask = dt.mask when Date, DateTime @#{col.to_s} = PartialDate.new(dt,0) self.#{col.to_s}_date = @#{col.to_s}.date self.#{col.to_s}_mask = @#{col.to_s}.mask end #case end #if else end #def EOL end end
def masked_attributes read_inheritable_attribute("attr_masked") || write_inheritable_array("attr_masked", ) end
def is_mask_column?(col_name) col = col_name.to_s if col =~ /^(.*)(_date|_mask)$/ base_col = $1 return is_masked?(base_col) end false end
def is_masked?(col_name) masked_attributes.include?(col_name.to_sym) end
private def execute_callstack_for_multiparameter_attributes_with_mask(callstack) new_callstack = Hash.new() callstack.each_with_index do |arr, i| name, values = *arr if self.class.is_masked? name date_name = name + "_date" set_mask(name, values.nil? ? 0 : 3 - values.length) new_callstack.merge!({date_name => values}) else new_callstack.merge!({name => values}) end end
execute_callstack_for_multiparameter_attributes_without_mask(new_callstack) end
def set_mask(col,value) self.send("#{col}_mask=",value) end
</code>
So I could use it like so:
class Person < ActiveRecord::Base mask_attributes :born, :died end
and the database would look like
table people born_date date born_mask integer died_date date died_mask integer
The code for PartialDate is an unreadable mess because of all the regexes I use, but it shouldn't be too hard to cobble something together for your own use.
Hope that helps
Sorry, posted to wrong group -- thought I was in Rails-Talk...
