Extends ActiveRecord by adding pluck_to_hash method that returns array of hashes instead of array of arrays. Useful when plucking multiple columns for rendering json or you need to access individual fields in your view for example.
Supports pluck_to_struct since version 0.3.0. pluck_to_struct returns an array of structs.
Add this line to your application's Gemfile:
gem 'pluck_to_hash'And then execute:
$ bundle
Or install it yourself as:
$ gem install pluck_to_hash
Usage is similar to ActiveRecord.pluck, for example
Post.limit(2).pluck_to_hash(:id, :title)
#
# [{:id=>213, :title=>"foo"}, {:id=>214, :title=>"bar"}]
#
Post.limit(2).pluck_to_hash(:id)
#
# [{:id=>213}, {:id=>214}]
#Or use the shorter alias pluck_h
Post.limit(2).pluck_h(:id)
#
# [{:id=>213}, {:id=>214}]
#Supports select alias
User.pluck_to_hash(:id, 'created_at::date as my_date', 'created_at::time as my_time')
#
# [{:id=>23, :my_date=>Fri, 11 Jul 2014, :my_time=>2000-01-01 07:54:36 UTC},
# {:id=>2, :my_date=>Tue, 01 Jul 2014, :my_time=>2000-01-01 14:36:15 UTC}]
#Accepts block parameter
User.pluck_to_hash(:id, :title) do |user_hash|
...
endAllows specifying the type of hash. Defaults to HashWithIndifferentAccess
User.pluck_to_hash(:id, :title, hash_type: CustomHash) do |custom_hash|
...
endposts = Post.limit(2).pluck_to_struct(:id, :title)
#
# [#<struct id=1, title="foo">, #<struct id=2, title="bar">]
#
posts.first.id
# 1
posts.first.title
# "foo"or use the shorter alias pluck_s
posts = Post.limit(2).pluck_s(:id, :title)
#
# [#<struct id=1, title="foo">, #<struct id=2, title="bar">]
#Supports block parameter as well
Post.limit(2).pluck_to_struct(:id, :title) do |post_struct|
puts post_struct.title
endAllows specifying the type of struct. Defaults to standard Struct.
Post.limit(2).pluck_to_struct(:id, :title, struct_type: OtherStructType) do |post_struct|
puts post_struct.title
endUse version 0.1.4 that removes ActiveSupport dependency. HashWithIndifferentAccess is not used in that case.
Here are results of "benchmark" tests performed on MacBook Air. Each method did 10 runs, rejected the 2 highest and 2 lowest times and average the remaining 6. Ran these tests on about 40,000 records. We notice that pluck_to_hash is almost 4x faster than select and about 8x faster than as_json. As with all the "benchmarks", you should take these results with a pinch of salt!
# Node.pluck_h(:id, :title)
# Node.select(:id, :title).to_a
# Node.select(:id, :title).as_json
user system total real
pluck_to_hash 0.145000 0.005000 0.150000 ( 0.164836)
select 0.566667 0.010000 0.576667 ( 0.590911)
as_json 1.196667 0.010000 1.206667 ( 1.222286)- Fork it ( https://github.com/girishso/pluck_to_hash/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request
MIT License
Brought to you by: Cube Root Software © 2016
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