Module: WillPaginate::ActiveRecord::RelationMethods

Includes:
CollectionMethods
Defined in:
lib/will_paginate/active_record.rb

Overview

makes a Relation look like WillPaginate::Collection

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from CollectionMethods

#next_page, #out_of_bounds?, #previous_page, #total_pages

Instance Attribute Details

#current_page ⇒ Object

Returns the value of attribute current_page.



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# File 'lib/will_paginate/active_record.rb', line 23

def current_page
  @current_page
end

#total_entries ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 68

def total_entries
  @total_entries ||= begin
    if loaded? and size < limit_value and (current_page == 1 or size > 0)
      offset_value + size
    else
      @total_entries_queried = true
      result = count
      result = result.size if result.respond_to?(:size) and !result.is_a?(Integer)
      result
    end
  end
end

Instance Method Details

#clone ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 114

def clone
  copy_will_paginate_data super
end

#count(*args) ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 81

def count(*args)
  if limit_value
    excluded = [:order, :limit, :offset, :reorder]
    excluded << :includes unless eager_loading?
    rel = self.except(*excluded)
    column_name = if rel.select_values.present?
      select = rel.select_values.join(", ")
      select if select !~ /[,*]/
    end || :all
    rel.count(column_name)
  else
    super(*args)
  end
end

#empty? ⇒ Boolean

overloaded to be pagination-aware

Returns:

  • (Boolean) 


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# File 'lib/will_paginate/active_record.rb', line 106

def empty?
  if !loaded? and offset_value
    total_entries <= offset_value
  else
    super
  end
end

#find_last(*args) ⇒ Object

fix for Rails 3.0



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# File 'lib/will_paginate/active_record.rb', line 54

def find_last(*args)
  if !loaded? && args.empty? && (offset_value || limit_value)
    @last ||= to_a.last
  else
    super
  end
end

#first(*args) ⇒ Object

dirty hack to enable ‘first` after `limit` behavior above



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# File 'lib/will_paginate/active_record.rb', line 43

def first(*args)
  if current_page
    rel = clone
    rel.current_page = nil
    rel.first(*args)
  else
    super
  end
end

#limit(num) ⇒ Object

TODO: solve with less relation clones and code dups



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# File 'lib/will_paginate/active_record.rb', line 33

def limit(num)
  rel = super
  if rel.current_page
    rel.offset rel.current_page.to_offset(rel.limit_value).to_i
  else
    rel
  end
end

#offset(value = nil) ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 62

def offset(value = nil)
  if value.nil? then offset_value
  else super(value)
  end
end

#per_page(value = nil) ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 26

def per_page(value = nil)
  if value.nil? then limit_value
  else limit(value)
  end
end

#scoped(options = nil) ⇒ Object

workaround for Active Record 3.0



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# File 'lib/will_paginate/active_record.rb', line 119

def scoped(options = nil)
  copy_will_paginate_data super
end

#size ⇒ Object

workaround for Active Record 3.0



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# File 'lib/will_paginate/active_record.rb', line 97

def size
  if !loaded? and limit_value and group_values.empty?
    [super, limit_value].min
  else
    super
  end
end

#to_a ⇒ Object 



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# File 'lib/will_paginate/active_record.rb', line 123

def to_a
  if current_page.nil? then super # workaround for Active Record 3.0
  else
    ::WillPaginate::Collection.create(current_page, limit_value) do |col|
      col.replace super
      col.total_entries ||= total_entries
    end
  end
end