Module: Pading::PageScopeMethods

Defined in:
lib/pading/activerecord/page_scope_menthods.rb

Instance Method Summary collapse

Instance Method Details

#current_page ⇒ Object

获取当前page



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 16

def current_page
  # offset_value  limit_value 元编程自动生成的查询
  # limit_value 每一页多少个
  # offset_value 从第几个开始查询
 (offset_value / limit_value) + 1
end

#first_page? ⇒ Boolean

Returns:



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 53

def first_page?
  current_page == 1
end

#last_page? ⇒ Boolean

Returns:



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 57

def last_page?
  current_page == total_pages
end

#next_page ⇒ Object 



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 45

def next_page
  current_page + 1 unless last_page?
end

#per(num, max_per_page: nil) ⇒ Object 



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 4

def per(num, max_per_page: nil)
  if (n = num.to_i ) < 0 ||  !(/^\d/ =~ num.to_s)
    self
  elsif n.zero? # zero 是否为0
    limit(n)
  else
    limit(n).offset(offset_value / limit_value * n)
  end
end

#prev_page ⇒ Object 



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 49

def prev_page
  current_page - 1 unless first_page?
end

#total_count(column_name = :all, _options = nil) ⇒ Object 



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 24

def total_count(column_name = :all, _options = nil)
  return @total_count if defined?(@total_count) && @total_count
  c = except(:offset, :limit, :order)
  # TODO references_eager_loaded_tables? API 没有这个方法的描述
  c = c.except(:includes) unless references_eager_loaded_tables?
  c = c.count(column_name)
  @total_count = if c.is_a?(Hash) || c.is_a?(ActiveSupport::OrderedHash)
                   c.count
                 elsif c.respond_to? :count
                   c.count(column_name)
                 else
                   c
                 end

end

#total_pages ⇒ Object 



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# File 'lib/pading/activerecord/page_scope_menthods.rb', line 40

def total_pages
  (total_count.to_f / limit_value).ceil
end