CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-3model
glarkou
glarkou

Reputation: 7101

Finding relevant attributes in a model

I have a model with 30 attributes. but those attributes can be grouped in 2 groups.

For example I have:

string:title
string:text
...

and

string:title_old
string:text_old
...

I want to be able: When I check title attribute at the same time to check the title_old attribute. Can I perform that with a loop if I make an array of the 15 first strings or I should write hard coded if statements

Final goal:

        [
          {
             :name => :title,
             :y => 1 (constant),
             :color=> red, (if title_old == "something" color = red else color = green)
          },
          {
             :name=> :text,
             :y => 1 (constant)
             :color => red (if text_old == "something" color = red else color = green)
          },
          .... (all other 13 attributes)
       ]

Upvotes: 1

Views: 121

Answers (4)

fl00r
fl00r

Reputation: 83680

your model:

class MyModel < AR::Base
  def attributize
    attrs = self.attributes.except(:created_at, :updated_at).reject{ |attr, val| attr =~ /.*_old/ && !val }
    attrs.inject([]) do |arr, (attr, val)|
      arr << { :name => attr, :y => 1, :color => (self.send("#{attr}_old") == "something" ? "red" : "green") }
    end
  end
end

usage:

my_object = MyModel.last
my_object.attributize

Upvotes: 1

Sameer C
Sameer C

Reputation: 2797

use state_machine, that way your logic will be in one place with a clear dsl. https://github.com/pluginaweek/state_machine

Upvotes: 0

kain
kain

Reputation: 5570

Very simple example:

class MyModel
  def identify_color
    if send("#{name}_old".to_sym) == "something"
      'red'
    else
      'green'
    end
  end
end

MyModel.all.collect do |instance|
  attrs = instance.attributes
  attrs.merge!('color' => identify_color)
  attrs
end

Add some rescue at will, but it can be done in different ways.

Upvotes: 1

Harish Shetty
Harish Shetty

Reputation: 64363

Try this:

[
 :title,
 ..,
 ..
 :description
].map do |attr|
  {
    :name => attr,
    :y => 1 (constant),
    :color=> (read_attribute("#{attr}_old") == "something") ? "red" : "green"
  }  
end

PS: Naming an attribute text is a bad idea.

Upvotes: 0

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