Class: PatternQueryHelper::Pagination

Inherits:
Object
  • Object
show all
Defined in:
lib/pattern_query_helper/pagination.rb

Class Method Summary collapse

Class Method Details

.create_pagination_payload(count, pagination_params) ⇒ Object 



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# File 'lib/pattern_query_helper/pagination.rb', line 34

def self.create_pagination_payload(count, pagination_params)
  page = pagination_params[:page]
  per_page = pagination_params[:per_page]
  total_pages = (count/(per_page.nonzero? || 1).to_f).ceil
  next_page = page + 1 if page.between?(1, total_pages - 1)
  previous_page = page - 1 if page.between?(2, total_pages)
  first_page = page == 1
  last_page = page == total_pages
  out_of_range = !page.between?(1,total_pages)

  {
    count: count,
    current_page: page,
    next_page: next_page,
    previous_page: previous_page,
    total_pages: total_pages,
    per_page: per_page,
    first_page: first_page,
    last_page: last_page,
    out_of_range: out_of_range
  }
end

.paginate_active_record_query(active_record_call, pagination_params) ⇒ Object 



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# File 'lib/pattern_query_helper/pagination.rb', line 57

def self.paginate_active_record_query(active_record_call, pagination_params)
  page = pagination_params[:page]
  per_page = pagination_params[:per_page]
  active_record_call.page(page).per(per_page)
end

.parse_pagination_params(params) ⇒ Object 



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# File 'lib/pattern_query_helper/pagination.rb', line 6

def self.parse_pagination_params(params)
  if params[:per_page] == 'all'
    pagination_params = {
      include_all: true
    }
  else
    if params[:page]
      page = params[:page].to_i
    else
      page = 1
    end
    if params[:per_page]
      per_page = params[:per_page].to_i
    else
      per_page = 20
    end
    raise RangeError.new("page must be greater than 0") unless page > 0
    raise RangeError.new("per_page must be greater than 0") unless per_page > 0
    pagination_params = {
      page: page.to_i,
      per_page: per_page.to_i
    }
  end

  pagination_params

end