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| class ApplicationController < ActionController::Base | |
| #... | |
| # this method expects a class to be passed with the attributes @@per_page, | |
| # @@:per_page_max defined | |
| def prepare_pagination(paginable_class) | |
| # STEP 1: Prepare values | |
| # STEP 1a: Prepare page | |
| # what the client wants or 1 per default | |
| page = params[:page].nil?? | |
| 1 : params[:page].to_i | |
| # STEP 1b: Prepare per_page | |
| # either use what the client asks for or take the models defaults | |
| per_page = params[:per_page].nil?? | |
| paginable_class.per_page : params[:per_page].to_i | |
| # STEP 2: Sanity checks | |
| # STEP 2a: Check page boundaries (page must at leaste be 1, but there are | |
| # no max max restrictions, worst case: an empty set will be returned) | |
| page = [page, 1].max | |
| # STEP 2b: Assure proper boundaries for per_page: | |
| # at least one per page but not more than the model allows us | |
| per_page = [per_page, 1].max | |
| per_page = [per_page, paginable_class.per_page_max].min | |
| #return per_page, page | |
| return per_page, page | |
| end | |
| # this method expects a WillPaginate::Collection to be given (aplying | |
| # .paginate on models or scopes delivers these objects), examines it and | |
| # delivers flincs cutom paginable http headers | |
| def set_pagination_headers(p) | |
| return unless p.is_a?(WillPaginate::Collection) | |
| response.headers["X-Pagination-Total-Entries"] = p.total_entries.to_s | |
| response.headers["X-Pagination-Per-Page"] = p.per_page.to_s | |
| response.headers["X-Pagination-Total-Pages"] = p.total_pages.to_s | |
| response.headers["X-Pagination-Current-Page"] = p.current_page.to_s | |
| end | |
| end |
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