Class: AbstractFeature
- Inherits:
-
ActiveRecord::Base
- Object
- ActiveRecord::Base
- AbstractFeature
- Defined in:
- app/models/abstract_feature.rb
Direct Known Subclasses
Constant Summary collapse
- FEATURE_TYPES =
%w(polygon point line)
Instance Attribute Summary collapse
-
#make_valid ⇒ Object
writeonly
Sets the attribute make_valid.
Class Method Summary collapse
- .area_in_square_meters(geom = 'geom_lowres') ⇒ Object
- .cache_derivatives(options = {}) ⇒ Object
- .cache_key ⇒ Object
-
.collection_cache_key(_collection, _timestamp_column) ⇒ Object
for Rails >= 5 ActiveRecord collections we override the collection_cache_key to prevent Rails doing its default query on ‘updated_at`.
-
.geojson(lowres: false, precision: 6, properties: true, srid: 4326, centroids: false) ⇒ Object
default srid is 4326 so output is Google Maps compatible.
- .intersecting(other) ⇒ Object
- .invalid(column = 'geog::geometry') ⇒ Object
- .lines ⇒ Object
- .points ⇒ Object
- .polygons ⇒ Object
- .total_intersection_area_in_square_meters(other_features, geom = 'geom_lowres') ⇒ Object
- .valid ⇒ Object
- .with_metadata(k, v) ⇒ Object
- .within_distance(lat, lng, distance_in_meters) ⇒ Object
- .without_caching_derivatives(&block) ⇒ Object
Instance Method Summary collapse
- #cache_derivatives(*args) ⇒ Object
- #envelope(buffer_in_meters = 0) ⇒ Object
- #feature_bounds ⇒ Object
- #geojson(*args) ⇒ Object
- #kml(options = {}) ⇒ Object
- #make_valid? ⇒ Boolean
Instance Attribute Details
#make_valid=(value) ⇒ Object
Sets the attribute make_valid
12 13 14 |
# File 'app/models/abstract_feature.rb', line 12 def make_valid=(value) @make_valid = value end |
Class Method Details
.area_in_square_meters(geom = 'geom_lowres') ⇒ Object
57 58 59 60 |
# File 'app/models/abstract_feature.rb', line 57 def self.area_in_square_meters(geom = 'geom_lowres') current_scope = all.polygons unscoped { SpatialFeatures::Utils.select_db_value(select("ST_Area(ST_Union(#{geom}))").from(current_scope, :features)).to_f } end |
.cache_derivatives(options = {}) ⇒ Object
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 |
# File 'app/models/abstract_feature.rb', line 101 def self.cache_derivatives( = {}) update_all <<-SQL.squish geom = ST_Transform(geog::geometry, #{detect_srid('geom')}), north = ST_YMax(geog::geometry), east = ST_XMax(geog::geometry), south = ST_YMin(geog::geometry), west = ST_XMin(geog::geometry), area = ST_Area(geog), centroid = ST_PointOnSurface(geog::geometry) SQL invalid('geom').update_all <<-SQL.squish geom = ST_Buffer(geom, 0) SQL update_all <<-SQL.squish geom_lowres = ST_SimplifyPreserveTopology(geom, #{.fetch(:lowres_simplification, lowres_simplification)}) SQL invalid('geom_lowres').update_all <<-SQL.squish geom_lowres = ST_Buffer(geom_lowres, 0) SQL end |
.cache_key ⇒ Object
28 29 30 |
# File 'app/models/abstract_feature.rb', line 28 def self.cache_key "#{maximum(:id)}-#{count}" end |
.collection_cache_key(_collection, _timestamp_column) ⇒ Object
for Rails >= 5 ActiveRecord collections we override the collection_cache_key to prevent Rails doing its default query on ‘updated_at`
24 25 26 |
# File 'app/models/abstract_feature.rb', line 24 def self.collection_cache_key(_collection, ) self.cache_key end |
.geojson(lowres: false, precision: 6, properties: true, srid: 4326, centroids: false) ⇒ Object
default srid is 4326 so output is Google Maps compatible
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 |
# File 'app/models/abstract_feature.rb', line 125 def self.geojson(lowres: false, precision: 6, properties: true, srid: 4326, centroids: false) # default srid is 4326 so output is Google Maps compatible if centroids column = 'centroid' elsif lowres column = "ST_Transform(geom_lowres, #{srid})" else column = 'geog' end properties_sql = <<~SQL if properties , 'properties', hstore_to_json(metadata) SQL sql = <<~SQL json_build_object( 'type', 'FeatureCollection', 'features', json_agg( json_build_object( 'type', 'Feature', 'geometry', ST_AsGeoJSON(#{column}, #{precision})::json #{properties_sql} ) ) ) SQL SpatialFeatures::Utils.select_db_value(all.select(sql)) end |
.intersecting(other) ⇒ Object
72 73 74 |
# File 'app/models/abstract_feature.rb', line 72 def self.intersecting(other) join_other_features(other).where('ST_Intersects(features.geom_lowres, other_features.geom_lowres)').uniq end |
.invalid(column = 'geog::geometry') ⇒ Object
76 77 78 |
# File 'app/models/abstract_feature.rb', line 76 def self.invalid(column = 'geog::geometry') select("features.*, ST_IsValidReason(#{column}) AS invalid_geometry_message").where.not("ST_IsValid(#{column})") end |
.lines ⇒ Object
44 45 46 |
# File 'app/models/abstract_feature.rb', line 44 def self.lines where(:feature_type => 'line') end |
.points ⇒ Object
48 49 50 |
# File 'app/models/abstract_feature.rb', line 48 def self.points where(:feature_type => 'point') end |
.polygons ⇒ Object
40 41 42 |
# File 'app/models/abstract_feature.rb', line 40 def self.polygons where(:feature_type => 'polygon') end |
.total_intersection_area_in_square_meters(other_features, geom = 'geom_lowres') ⇒ Object
62 63 64 65 66 67 68 69 70 |
# File 'app/models/abstract_feature.rb', line 62 def self.total_intersection_area_in_square_meters(other_features, geom = 'geom_lowres') scope = unscope(:select).select("ST_Union(#{geom}) AS geom").polygons other_scope = other_features.polygons query = base_class.unscoped.select('ST_Area(ST_Intersection(ST_Union(features.geom), ST_Union(other_features.geom)))') .from(scope, "features") .joins("INNER JOIN (#{other_scope.to_sql}) AS other_features ON ST_Intersects(features.geom, other_features.geom)") return SpatialFeatures::Utils.select_db_value(query).to_f end |
.valid ⇒ Object
80 81 82 |
# File 'app/models/abstract_feature.rb', line 80 def self.valid where('ST_IsValid(geog::geometry)') end |
.with_metadata(k, v) ⇒ Object
32 33 34 35 36 37 38 |
# File 'app/models/abstract_feature.rb', line 32 def self.(k, v) if k.present? && v.present? where('metadata->? = ?', k, v) else all end end |
.within_distance(lat, lng, distance_in_meters) ⇒ Object
52 53 54 55 |
# File 'app/models/abstract_feature.rb', line 52 def self.within_distance(lat, lng, distance_in_meters) # where("ST_DWithin(features.geog, ST_SetSRID( ST_Point( -71.104, 42.315), 4326)::geography, :distance)", :lat => lat, :lng => lng, :distance => distance_in_meters) where("ST_DWithin(features.geog, ST_Point(:lng, :lat), :distance)", :lat => lat, :lng => lng, :distance => distance_in_meters) end |
.without_caching_derivatives(&block) ⇒ Object
93 94 95 96 97 98 99 |
# File 'app/models/abstract_feature.rb', line 93 def self.without_caching_derivatives(&block) old = automatically_cache_derivatives self.automatically_cache_derivatives = false block.call ensure self.automatically_cache_derivatives = old end |
Instance Method Details
#cache_derivatives(*args) ⇒ Object
157 158 159 |
# File 'app/models/abstract_feature.rb', line 157 def cache_derivatives(*args) self.class.default_scoped.where(:id => self.id).cache_derivatives(*args) end |
#envelope(buffer_in_meters = 0) ⇒ Object
84 85 86 87 88 89 90 91 |
# File 'app/models/abstract_feature.rb', line 84 def envelope(buffer_in_meters = 0) envelope_json = JSON.parse(self.class.select("ST_AsGeoJSON(ST_Envelope(ST_Buffer(features.geog, #{buffer_in_meters})::geometry)) AS result").where(:id => id).first.result) envelope_json = envelope_json["coordinates"].first raise "Can't calculate envelope for Feature #{self.id}" if envelope_json.blank? return envelope_json.values_at(0,2) end |
#feature_bounds ⇒ Object
153 154 155 |
# File 'app/models/abstract_feature.rb', line 153 def feature_bounds slice(:north, :east, :south, :west) end |
#geojson(*args) ⇒ Object
167 168 169 |
# File 'app/models/abstract_feature.rb', line 167 def geojson(*args) self.class.where(id: id).geojson(*args) end |
#kml(options = {}) ⇒ Object
161 162 163 164 165 |
# File 'app/models/abstract_feature.rb', line 161 def kml( = {}) geometry = [:lowres] ? kml_lowres : super() geometry = "<MultiGeometry>#{geometry}#{kml_centroid}</MultiGeometry>" if [:centroid] return geometry end |
#make_valid? ⇒ Boolean
171 172 173 |
# File 'app/models/abstract_feature.rb', line 171 def make_valid? @make_valid end |