-# ====================================================================
-# Relations handling
-# deleteuniquenoderelations(uqn_name,uid,db_now)
-# deleteitemrelations(way|node,'way'|'node',uid,db_now)
-
-def deleteuniquenoderelations(uqn_name,uid,db_now)
- sql=<<-EOF
- SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr
- WHERE crm.member_id=node_id
- AND crm.member_type='node'
- AND crm.id=cr.id
- AND cr.visible=1
- EOF
-
- relnodes=ActiveRecord::Base.connection.select_all(sql)
- relnodes.each do |a|
- removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
- end
-end
-
-def deleteitemrelations(objid,type,uid,db_now)
- sql=<<-EOF
- SELECT cr.id FROM current_relation_members crm,current_relations cr
- WHERE crm.member_id=#{objid}
- AND crm.member_type='#{type}'
- AND crm.id=cr.id
- AND cr.visible=1
- EOF
-
- relways=ActiveRecord::Base.connection.select_all(sql)
- relways.each do |a|
- removefromrelation(objid,type,a['id'],uid,db_now)
- end
-end
-
-def removefromrelation(objid,type,relation,uid,db_now)
- rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
-
- tagsql=<<-EOF
- INSERT INTO relation_tags (id,k,v,version)
- SELECT id,k,v,#{rver} FROM current_relation_tags
- WHERE id=#{relation}
- EOF
- ActiveRecord::Base.connection.insert(tagsql)
-
- membersql=<<-EOF
- INSERT INTO relation_members (id,member_type,member_id,member_role,version)
- SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members
- WHERE id=#{relation}
- AND (member_id!=#{objid} OR member_type!='#{type}')
- EOF
- ActiveRecord::Base.connection.insert(membersql)
-
- ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
- ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
-end