Tweaks to # of maps shown on front page, per "region"

[jywarren]

The "regions" code here fulfills requests from the front page map (and other types of requests):

mapknitter/app/controllers/maps_controller.rb

Lines 136 to 152 in 4756a3c

	# list by region
	def region
	area = params[:id] || 'this area'
	@title = "Maps in #{area}"
	ids = Map.bbox(params[:minlat], params[:minlon], params[:maxlat], params[:maxlon]).collect(&:id)
	@maps = Map.where(password: '')
	.where('id IN (?)', ids)
	.paginate(page: params[:page], per_page: 24)
	.except(:styles, :email)
	@maps.each do |map|
	map.image_urls = map.warpables.map { |warpable| warpable.image.url }
	end
	respond_to do |format|
	format.html { render 'maps/index', layout: 'application' }
	format.json { render json: @maps.to_json(methods: :image_urls) }
	end
	end

It's accessed in JSON via:

https://mapknitter.org/map/region/Gulf-Coast.json?minlon=16.017661392688755&minlat=12.539611262767895&maxlon=158.22469264268878&maxlat=67.19809660495382

(for example)

Actually, Gulf-Coast is not needed, it can be any name:

https://mapknitter.org/map/region/region.json?minlon=16.01&minlat=12.53&maxlon=158.22&maxlat=67.19

Let's do 2 things:

• increase the number of maps to... 50?
• cache these daily, using the technique below, to speed up response time, esp. for "featured" regions.
• the "regions" route there seems like it could be modified to include a tag parameter to filter for maps with a tag!

Rails.cache.fetch("some-unique-cache-key", expires_in: 1.day) do
  # code to be cached wrapped here
end

number of map code would be:

               .paginate(page: params[:page], per_page: 24)

cc @ebarry

[jywarren]

There could be potential for trimming the results for efficiency too, but let's think about that later!

{"id":67,"name":"qalandia","lat":"31.8704553147","lon":"35.2206727512","version":1,"password":"","styles":"VERY_LONG_STRING","created_at":"2010-06-25T10:36:58.000Z","updated_at":"2014-11-13T19:22:11.000Z","description":null,"author":"anonymous","zoom":"16.0","location":"Qalandia","static_data":"","vectors":false,"tiles":"google","email":"","archived":false,"tile_url":"","tile_layer":"","license":"copyright","user_id":0,"anon_annotatable":false,"slug":"qalandia","image_urls":["https://s3.amazonaws.com/grassrootsmapping/warpables/625/kafr_aqb.png"]}