Sort an Array of ActiveRecords objects by created_at

rubyonrails-talk
1

Hi, I have an array of activerecords objects. I'd like to sort it by created_at column (they all have one). Do you see a smart way to do it ??

Thanks,

Mike

2

what's wrong with:

@my_model = Model.find(:all, :order => "created_at ASC"))

3

My array is composed by different activerecord objects:

my_model1 = Model.find(:all)

my_model2 = Model.find(:all)

@my_models = my_model1 + mymodel2

and now i'd like to sort @my_models by "created_at"

4

@my_models = @my_models.sort_by { |m| m.created_at }

Note that Enumerable#sort_by returns a new array.

Regards, Craig

5

Yes that's it ! !

Thank you, Mike.

6

Even simpler:

my_model1 = Model.find(:all) my_model2 = Model.find(:all)

@my_models = (my_model1 + mymodel2).sort_by( &:created_at )

7

Thanks Maurício,

Even simpler:

my_model1 = Model.find(:all) my_model2 = Model.find(:all)

@my_models = (my_model1 + mymodel2).sort_by( &:created_at )

What the '&' do precisely ?

8

Hi Michael,

The &:created_at is just a shorthand for &Proc.new { |i| i.created_at }

9

excellent ! Thanks for the tip.

Mike

10

excellent ! Thanks for the tip.

Mike

11

Hi Michael,

The &:created_at is just a shorthand for &Proc.new { |i| i.created_at }

Although it should be noted that this (also known as Symbol#to_proc) is a lot slower than just writing the equivalent block (but not in ruby 1.9 or if my memory is correct, 1.8.7)

Fred