178 lines
5 KiB
Ruby
178 lines
5 KiB
Ruby
class OldWay < ActiveRecord::Base
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include ConsistencyValidations
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include Redactable
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self.table_name = "ways"
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self.primary_keys = "way_id", "version"
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belongs_to :changeset
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belongs_to :redaction
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belongs_to :current_way, :class_name => "Way", :foreign_key => "way_id"
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has_many :old_nodes, :class_name => 'OldWayNode', :foreign_key => [:way_id, :version]
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has_many :old_tags, :class_name => 'OldWayTag', :foreign_key => [:way_id, :version]
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validates_associated :changeset
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def self.from_way(way)
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old_way = OldWay.new
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old_way.visible = way.visible
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old_way.changeset_id = way.changeset_id
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old_way.timestamp = way.timestamp
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old_way.way_id = way.id
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old_way.version = way.version
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old_way.nds = way.nds
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old_way.tags = way.tags
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return old_way
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end
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def save_with_dependencies!
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# dont touch this unless you really have figured out why it's called
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# (Rails doesn't deal well with the old ways table (called 'ways') because
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# it doesn't have a unique key. It knows how to insert and auto_increment
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# id and get it back but we have that and we want to get the 'version' back
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# we could add another column but thats a lot of data. No, set_primary_key
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# doesn't work either.
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save!
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clear_aggregation_cache
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clear_association_cache
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@attributes.update(OldWay.where(:way_id => self.way_id, :timestamp => self.timestamp).order("version DESC").first.instance_variable_get('@attributes'))
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# ok, you can touch from here on
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self.tags.each do |k,v|
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tag = OldWayTag.new
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tag.k = k
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tag.v = v
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tag.way_id = self.way_id
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tag.version = self.version
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tag.save!
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end
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sequence = 1
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self.nds.each do |n|
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nd = OldWayNode.new
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nd.id = [self.way_id, self.version, sequence]
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nd.node_id = n
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nd.save!
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sequence += 1
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end
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end
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def nds
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unless @nds
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@nds = Array.new
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OldWayNode.where(:way_id => self.way_id, :version => self.version).order(:sequence_id).each do |nd|
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@nds += [nd.node_id]
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end
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end
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@nds
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end
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def tags
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unless @tags
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@tags = Hash.new
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OldWayTag.where(:way_id => self.way_id, :version => self.version).each do |tag|
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@tags[tag.k] = tag.v
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end
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end
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@tags = Hash.new unless @tags
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@tags
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end
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def nds=(s)
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@nds = s
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end
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def tags=(t)
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@tags = t
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end
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def to_xml_node
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el1 = XML::Node.new 'way'
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el1['id'] = self.way_id.to_s
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el1['visible'] = self.visible.to_s
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el1['timestamp'] = self.timestamp.xmlschema
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if self.changeset.user.data_public?
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el1['user'] = self.changeset.user.display_name
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el1['uid'] = self.changeset.user.id.to_s
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end
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el1['version'] = self.version.to_s
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el1['changeset'] = self.changeset.id.to_s
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if self.redacted?
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el1['redacted'] = self.redaction.title
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end
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unless self.redacted? and (@user.nil? or not @user.moderator?)
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# If a way is redacted and the user isn't a moderator, only show
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# meta-data from this revision, but no real data.
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self.old_nodes.each do |nd| # FIXME need to make sure they come back in the right order
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e = XML::Node.new 'nd'
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e['ref'] = nd.node_id.to_s
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el1 << e
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end
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self.old_tags.each do |tag|
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e = XML::Node.new 'tag'
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e['k'] = tag.k
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e['v'] = tag.v
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el1 << e
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end
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end
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return el1
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end
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# Read full version of old way
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# For get_nodes_undelete, uses same nodes, even if they've moved since
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# For get_nodes_revert, allocates new ids
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# Currently returns Potlatch-style array
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# where [5] indicates whether latest version is usable as is (boolean)
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# (i.e. is it visible? are we actually reverting to an earlier version?)
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def get_nodes_undelete
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points = []
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self.nds.each do |n|
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node = Node.find(n)
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points << [node.lon, node.lat, n, node.version, node.tags_as_hash, node.visible]
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end
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points
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end
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def get_nodes_revert(timestamp)
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points=[]
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self.nds.each do |n|
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oldnode = OldNode.where('node_id = ? AND timestamp <= ?', n, timestamp).order("timestamp DESC").first
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curnode = Node.find(n)
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id = n; reuse = curnode.visible
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if oldnode.lat != curnode.lat or oldnode.lon != curnode.lon or oldnode.tags != curnode.tags then
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# node has changed: if it's in other ways, give it a new id
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if curnode.ways-[self.way_id] then id=-1; reuse=false end
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end
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points << [oldnode.lon, oldnode.lat, id, curnode.version, oldnode.tags_as_hash, reuse]
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end
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points
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end
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# Temporary method to match interface to nodes
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def tags_as_hash
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return self.tags
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end
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# Temporary method to match interface to ways
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def way_nodes
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return self.old_nodes
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end
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# Pretend we're not in any relations
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def containing_relation_members
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return []
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end
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# check whether this element is the latest version - that is,
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# has the same version as its "current" counterpart.
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def is_latest_version?
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current_way.version == self.version
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end
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end
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