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e3b8db5876
In Ruby 1.9.2, syntax for optional block parameters is available, but behaviour for missing block parameters also changed. When no arguments are provided to Model.page, "ArgumentError: wrong number of arguments (1 for 0)" is raised. This fix is an ugly workaround that is compatible with both 1.8 and 1.9.
63 lines
2 KiB
Ruby
63 lines
2 KiB
Ruby
module Kaminari
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DEFAULT_PER_PAGE = 25 unless defined? ::Kaminari::DEFAULT_PER_PAGE
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module ActiveRecordExtension
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extend ActiveSupport::Concern
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included do
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def self.inherited(kls) #:nodoc:
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# TERRIBLE HORRIBLE NO GOOD VERY BAD HACK: inheritable_attributes is not yet set here on AR 3.0
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unless kls.default_scoping
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new_inheritable_attributes = Hash[inheritable_attributes.map do |key, value|
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[key, value.duplicable? ? value.dup : value]
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end]
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kls.instance_variable_set('@inheritable_attributes', new_inheritable_attributes)
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end
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kls.class_eval do
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# Fetch the values at the specified page number
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# Model.page(5)
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scope :page, lambda {|*num|
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raise ArgumentError if num.size > 1
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num = num.first || 1
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limit(default_per_page).offset(default_per_page * ([num.to_i, 1].max - 1))
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} do
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# Specify the <tt>per_page</tt> value for the preceding <tt>page</tt> scope
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# Model.page(3).per(10)
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def per(num)
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if (n = num.to_i) <= 0
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self
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else
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limit(n).offset(offset_value / limit_value * n)
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end
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end
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# Total number of pages
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def num_pages
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(except(:offset, :limit).count.to_f / limit_value).ceil
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end
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# Current page number
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def current_page
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(offset_value / limit_value) + 1
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end
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end
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# Overrides the default per_page value per model
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# class Article < ActiveRecord::Base
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# paginates_per 10
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# end
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def self.paginates_per(val)
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@_default_per_page = val
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end
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# This model's default per_page value
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# returns 25 unless explicitly overridden via <tt>paginates_per</tt>
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def self.default_per_page
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@_default_per_page || Kaminari::DEFAULT_PER_PAGE
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end
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end
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end
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end
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end
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end
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