simple rdf export of maps

app/controllers/maps_controller.rb

@@ -20,6 +20,7 @@ class MapsController < ApplicationController
       end
       format.json { render json: @map }
       format.csv { redirect_to action: :export, format: :csv }
+      format.rdf { redirect_to action: :export, format: :rdf }
     end
   end
 
@@ -94,6 +95,7 @@ class MapsController < ApplicationController
     respond_to do |format|
       format.json { render json: exporter.json }
       format.csv { send_data exporter.csv }
+      format.ttl { render text: exporter.rdf }
     end
   end
 

app/models/synapse.rb

@@ -51,6 +51,17 @@ class Synapse < ApplicationRecord
     super(methods: [:user_name, :user_image, :collaborator_ids])
   end
 
+  def as_rdf
+    output = ''
+    output += %(d:synapse_#{id} a mm:synapse ;\n)
+    output += %(  mm:topic1 d:topic_#{topic1_id} ;\n)
+    output += %(  mm:topic2 d:topic_#{topic2_id} ;\n)
+    output += %(  mm:direction "#{category}" ;\n)
+    output[-2] = '.'
+    output += %(\n)
+    output
+  end
+
   def after_updated
     attrs = ['desc', 'category', 'permission', 'defer_to_map_id']
     if attrs.any? {|k| changed_attributes.key?(k)}

app/models/topic.rb

@@ -82,6 +82,17 @@ class Topic < ApplicationRecord
              map_count: map_count(options[:user]), synapse_count: synapse_count(options[:user]))
   end
 
+  def as_rdf
+    output = ''
+    output += %(d:topic_#{id} a mm:topic\n)
+    output += %(  rdfs:label "#{name}";\n)
+    output += %(  rdfs:comment "#{desc}";\n)
+    output += %(  foaf:homepage <#{link}>;\n) if link.present?
+    output[-2] = '.' # change last ; to a .
+    output += %(\n)
+    output
+  end
+
   def collaborator_ids
     if defer_to_map
       defer_to_map.editors.select { |mapper| mapper != user }.map(&:id)

app/models/user.rb

@@ -67,6 +67,16 @@ class User < ApplicationRecord
     json
   end
 
+  def as_rdf
+    output = ''
+    output += %(d:mapper_#{id} a foaf:OnlineAccount ;\n)
+    output += %(  foaf:accountName "#{name}";\n)
+    output += %(  foaf:accountServiceHomepage "https://metamaps.cc/mapper/#{id}";\n)
+    output[-2] = '.' # change last ; to a .
+    output += %(\n)
+    output
+  end
+
   def all_accessible_maps
     maps + shared_maps
   end

app/services/map_export_service.rb

@@ -22,6 +22,15 @@ class MapExportService
     end
   end
 
+  def rdf
+    output = ''
+    output += rdf_header
+    output += rdf_mappers
+    output += rdf_topics
+    output += rdf_synapses
+    output
+  end
+
   private
 
   def topic_headings
@@ -87,4 +96,38 @@ class MapExportService
 
     spreadsheet
   end
+
+  def rdf_header
+    output = ''
+    output += "PREFIX d: <https://metamaps.cc/maps/#{map.id}>\n"
+    output += "PREFIX gr: <https://metamaps.cc/rdf/map.owl.ttl>\n"
+    output += "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n"
+    output += "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n"
+    output += "\n"
+    output
+  end
+
+  def rdf_mappers
+    output = ''
+    map.contributors.each do |mapper|
+      output += mapper.as_rdf
+    end
+    output 
+  end
+
+  def rdf_topics
+    output = ''
+    map.topics.each do |topic|
+      output += topic.as_rdf
+    end
+    output
+  end
+
+  def rdf_synapses
+    output = ''
+    map.synapses.each do |synapse|
+      output += synapse.as_rdf
+    end
+    output
+  end
 end

public/owl/map.owl.ttl

@@ -0,0 +1,34 @@
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+
+@prefix :   <http://metamaps.cc/owl/map.owl.ttl#> .
+@prefix mm:   <http://metamaps.cc/owl/map.owl.ttl#> .
+
+: a owl:Ontology ;
+	rdfs:label "Metamaps Map"@en ;
+
+mm:topic a owl:Class ;
+	rdfs:label "One concept on a metamap"@en .
+
+mm:synapse a owl:Class ;
+  rdfs:label "Link between two topics on a metamap"@en .
+
+mm:topic1 a owl:ObjectProperty ;
+	a owl:FunctionalProperty ;
+	rdfs:label "first topic of a synapse"@en ;
+	rdfs:domain mm:topic ;
+	rdfs:range owl:Thing .
+
+mm:topic2 a owl:ObjectProperty ;
+	a owl:FunctionalProperty ;
+	rdfs:label "second topic of a synapse"@en ;
+	rdfs:domain mm:topic ;
+	rdfs:range owl:Thing .
+
+mm:direction a owl:objectProprty ;
+  a owl:FunctionalProperty ;
+  rdfs:label "from-to, both, or none"@en ;
+  rdfs:domain mm:synapse ;
+  rdfs:range xsd:string .