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Single changeset query #25

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Single changeset query #25

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28 changes: 28 additions & 0 deletions rails/app/controllers/changeset_api_controller.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,16 @@ def summary_tilerange
render :json => @summary_list.as_json, :callback => params[:callback]
end

def changeset_json
@changesets = find_changeset('json')
render :json => JSON[@changesets.map(&:generate_json)], :callback => params[:callback]
end

def changeset_geojson
@changesets = find_changeset('geojson')
render :json => changesets_to_geojson(@changesets, @x, @y, @zoom), :callback => params[:callback]
end

private
def find_changesets_by_tile(format)
@x, @y, @zoom = get_xyz(params)
Expand Down Expand Up @@ -97,6 +107,24 @@ def find_changesets_by_range(format)
changesets
end

def find_changeset(format)
@id = params[:id].to_i
changesets = ActiveRecord::Base.connection.select_all("
SELECT cs.*,
#{format == 'geojson' ? '(SELECT array_agg(ST_AsGeoJSON(g)) FROM unnest(t.geom) AS g) AS geom_geojson,' : ''}
#{format == 'geojson' ? '(SELECT array_agg(ST_AsGeoJSON(g)) FROM unnest(t.prev_geom) AS g) AS prev_geom_geojson,' : ''}
(SELECT ST_Extent(g) FROM unnest(t.geom) AS g)::text AS bboxes,
cs.bbox::box2d::text AS total_bbox,
(SELECT array_agg(g) FROM unnest(t.changes) AS g) AS change_ids
FROM changeset_tiles t
INNER JOIN changesets cs ON (cs.id = t.changeset_id)
WHERE cs.id = #{@id}
GROUP BY t.geom, t.prev_geom, t.changes
").collect {|row| Changeset.new(row)}
load_changes(changesets)
changesets
end

def generate_summary_tile
@x, @y, @zoom = get_xyz(params)
rows = ActiveRecord::Base.connection.select_all("WITH agg AS (
Expand Down
4 changes: 4 additions & 0 deletions rails/config/routes.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@
match 'api/0.1/summary/:zoom/:x/:y' => 'changeset_api#summary_tile', :constraints => @xyz_constrains
match 'api/0.1/summary/:zoom/:x1/:y1/:x2/:y2' => 'changeset_api#summary_tilerange', :constraints => @range_constrains, :format => 'json'

# Single changeset operations
match 'api/0.1/changeset/:id.geojson' => 'changeset_api#changeset_geojson', :constraints => { :id => /\d+/ }, :format => 'json'
match 'api/0.1/changeset/:id.json' => 'changeset_api#changeset_json', :constraints => { :id => /\d+/ }, :format => 'json'

# Map API
match 'api/0.1/kothic/:zoom/:x/:y.js' => 'map_api#kothic', :constraints => @xyz_constrains
end