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Add support for mongoid max_scan option

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respect the max_scan option in criteria

cache the total_count in the collection instance
prevent hitting db again in the same instance
This commit is contained in:
aptx4869 2013-12-12 10:53:14 +08:00
parent 918b6d5ac5
commit 88c163eb06
2 changed files with 65 additions and 1 deletions
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12
lib/kaminari/models/mongoid_criteria_methods.rb
View file

@ -9,7 +9,17 @@ module Kaminari
end
def total_count #:nodoc:
embedded? ? unpage.length : length
@total_count ||=
if embedded?
unpage.count
else
counter_result = count
if options[:max_scan] and options[:max_scan] < counter_result
options[:max_scan]
else
counter_result
end
end
end
private

54
spec/models/mongoid/mongoid_spec.rb
View file

@ -8,6 +8,60 @@ if defined? Mongoid
end
end
describe 'max_scan', :if => Mongoid::VERSION >= '3' do
context 'less than total' do
context 'page 1' do
subject { User.max_scan(20).page 1 }
it { should be_a Mongoid::Criteria }
its(:current_page) { should == 1 }
its(:prev_page) { should be_nil }
its(:next_page) { should be_nil }
its(:limit_value) { should == 25 }
its(:total_pages) { should == 1 }
its(:total_count) { should == 20 }
it { should skip(0) }
end
context 'page 2' do
subject { User.max_scan(30).page 2 }
it { should be_a Mongoid::Criteria }
its(:current_page) { should == 2 }
its(:prev_page) { should == 1 }
its(:next_page) { should be_nil }
its(:limit_value) { should == 25 }
its(:total_pages) { should == 2 }
its(:total_count) { should == 30 }
it { should skip 25 }
end
end
context 'more than total' do
context 'page 1' do
subject { User.max_scan(60).page 1 }
it { should be_a Mongoid::Criteria }
its(:current_page) { should == 1 }
its(:prev_page) { should be_nil }
its(:next_page) { should == 2 }
its(:limit_value) { should == 25 }
its(:total_pages) { should == 2 }
its(:total_count) { should == 41 }
it { should skip(0) }
end
context 'page 2' do
subject { User.max_scan(60).page 2 }
it { should be_a Mongoid::Criteria }
its(:current_page) { should == 2 }
its(:prev_page) { should == 1 }
its(:next_page) { should be_nil }
its(:limit_value) { should == 25 }
its(:total_pages) { should == 2 }
its(:total_count) { should == 41 }
it { should skip 25 }
end
end
end
describe '#page' do
context 'page 1' do