Class: Godmin::Paginator

Inherits:
Object
  • Object
show all
Defined in:
lib/godmin/paginator.rb

Constant Summary collapse

WINDOW_SIZE = 
7.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resources, per_page: 25, current_page: nil) ⇒ Paginator

Returns a new instance of Paginator.



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# File 'lib/godmin/paginator.rb', line 7

def initialize(resources, per_page: 25, current_page: nil)
  @resources    = resources
  @per_page     = per_page
  @current_page = current_page ? current_page.to_i : 1
end

Instance Attribute Details

#current_page ⇒ Object (readonly)

Returns the value of attribute current_page.



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# File 'lib/godmin/paginator.rb', line 5

def current_page
  @current_page
end

#per_page ⇒ Object (readonly)

Returns the value of attribute per_page.



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# File 'lib/godmin/paginator.rb', line 5

def per_page
  @per_page
end

Instance Method Details

#pages ⇒ Object 



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# File 'lib/godmin/paginator.rb', line 17

def pages
  @pages ||= begin
    pages = (1..total_pages).to_a

    return pages unless total_pages > WINDOW_SIZE

    if current_page < WINDOW_SIZE
      pages.slice(0, WINDOW_SIZE)
    elsif current_page > (total_pages - WINDOW_SIZE)
      pages.slice(-WINDOW_SIZE, WINDOW_SIZE)
    else
      pages.slice(pages.index(current_page) - (WINDOW_SIZE / 2), WINDOW_SIZE)
    end
  end
end

#paginate ⇒ Object 



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# File 'lib/godmin/paginator.rb', line 13

def paginate
  @resources.limit(per_page).offset(offset)
end

#total_pages ⇒ Object 



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# File 'lib/godmin/paginator.rb', line 33

def total_pages
  @total_pages ||= (total_resources.to_f / per_page).ceil
end

#total_resources ⇒ Object 



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# File 'lib/godmin/paginator.rb', line 37

def total_resources
  @total_resources ||= @resources.count
end