75 lines
2.1 KiB
Ruby
75 lines
2.1 KiB
Ruby
module Kaminari
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module PageScopeMethods
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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 || !(/^\d/ =~ num.to_s)
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self
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elsif n.zero?
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limit(n)
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elsif max_per_page && max_per_page < n
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limit(max_per_page).offset(offset_value / limit_value * max_per_page)
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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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def padding(num)
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@_padding = num
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offset(offset_value + num.to_i)
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end
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# Total number of pages
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def total_pages
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count_without_padding = total_count
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count_without_padding -= @_padding if defined?(@_padding) && @_padding
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count_without_padding = 0 if count_without_padding < 0
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total_pages_count = (count_without_padding.to_f / limit_value).ceil
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if max_pages.present? && max_pages < total_pages_count
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max_pages
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else
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total_pages_count
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end
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rescue FloatDomainError
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raise ZeroPerPageOperation, "The number of total pages was incalculable. Perhaps you called .per(0)?"
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end
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# Current page number
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def current_page
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offset_without_padding = offset_value
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offset_without_padding -= @_padding if defined?(@_padding) && @_padding
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offset_without_padding = 0 if offset_without_padding < 0
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(offset_without_padding / limit_value) + 1
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rescue ZeroDivisionError
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raise ZeroPerPageOperation, "Current page was incalculable. Perhaps you called .per(0)?"
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end
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# Next page number in the collection
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def next_page
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current_page + 1 unless last_page? || out_of_range?
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end
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# Previous page number in the collection
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def prev_page
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current_page - 1 unless first_page? || out_of_range?
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end
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# First page of the collection?
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def first_page?
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current_page == 1
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end
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# Last page of the collection?
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def last_page?
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current_page == total_pages
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end
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# Out of range of the collection?
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def out_of_range?
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current_page > total_pages
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end
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end
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end
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