donphan/app/controllers/concerns/api/pagination.rb

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# frozen_string_literal: true
module Api::Pagination
extend ActiveSupport::Concern
PAGINATION_PARAMS = %i(limit).freeze
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protected
def pagination_max_id
pagination_collection.last.id
end
def pagination_since_id
pagination_collection.first.id
end
def set_pagination_headers(next_path = nil, prev_path = nil)
links = []
links << [next_path, [%w(rel next)]] if next_path
links << [prev_path, [%w(rel prev)]] if prev_path
response.headers['Link'] = LinkHeader.new(links) unless links.empty?
end
def require_valid_pagination_options!
render json: { error: 'Pagination values for `offset` and `limit` must be positive' }, status: 400 if pagination_options_invalid?
end
def pagination_params(core_params)
params
.slice(*PAGINATION_PARAMS)
.permit(*PAGINATION_PARAMS)
.merge(core_params)
end
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private
def insert_pagination_headers
set_pagination_headers(next_path, prev_path)
end
def pagination_options_invalid?
params.slice(:limit, :offset).values.map(&:to_i).any?(&:negative?)
end
end