CODEWITHSUNDEEP
rubyarrays
nish
nish

Reputation: 7280

How to sort an array of class objects based on date?

I have the following array of hashes:

@products = {#<ProductProxy:0xb486d148 @pA={"productAvailableDateTs"=>"2013-12-04T23:07:12.592Z", "mPrice"=>, "pStock"=>, "id"=>, "productId"=>, "productDesignerId"=>}>,
#<ProductProxy:0xb4adf304 @pA={"productAvailableDateTs"=>"2013-1-04T23:07:12.592Z", "mPrice"=>, "pStock"=>, "id"=>, "productId"=>, "productDesignerId"=>}>,
#<ProductProxy:0xb4adecec @pA={"productAvailableDateTs"=>"2013-15-03T23:07:12.592Z", "mPrice"=>, "pStock"=>, "id"=>, "productId"=>, "productDesignerId"=>}>,

...
}

I want to sort the array based on productAvailableDateTs value, in descending order. I tried doing the following:

@products = @products.sort_by{ |k| -k['productAvailableDateTs'] }

But doing so, I am not able to access the productAvailableDateTs field. i tried to print @products[0]['productAvailableDateTs']. But it prints nil. How can I access the field correctly?

Upvotes: 1

Views: 73

Answers (1)

Torsten Robitzki
Torsten Robitzki

Reputation: 2555

If you don't need the data to be sorted by the database (assumed that you got that data from active record), you can convert it into an array and then sort it:

@products.to_a.sort{ |a,b| b.productAvailableDateTs <=> a.productAvailableDateTs }

If it is already an array:

@products.sort{ |a,b| b.productAvailableDateTs <=> a.productAvailableDateTs }

Edit: missed the order. The order is implemented by changing the first and second parameter.

Upvotes: 1

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