Convert lib files to model concerns

[rails.git] / app / models / concerns / consistency_validations.rb

diff --git a/app/models/concerns/consistency_validations.rb b/app/models/concerns/consistency_validations.rb
new file mode 100644 (file)
index 0000000..00c6ce9
--- /dev/null
+++ b/app/models/concerns/consistency_validations.rb
@@ -0,0 +1,49 @@
+module ConsistencyValidations
+  extend ActiveSupport::Concern
+
+  # Generic checks that are run for the updates and deletes of
+  # node, ways and relations. This code is here to avoid duplication,
+  # and allow the extention of the checks without having to modify the
+  # code in 6 places for all the updates and deletes. Some of these tests are
+  # needed for creates, but are currently not run :-(
+  # This will throw an exception if there is an inconsistency
+  def check_consistency(old, new, user)
+    if new.id != old.id || new.id.nil? || old.id.nil?
+      raise OSM::APIPreconditionFailedError, "New and old IDs don't match on #{new.class}. #{new.id} != #{old.id}."
+    elsif new.version != old.version
+      raise OSM::APIVersionMismatchError.new(new.id, new.class.to_s, new.version, old.version)
+    elsif new.changeset.nil?
+      raise OSM::APIChangesetMissingError
+    elsif new.changeset.user_id != user.id
+      raise OSM::APIUserChangesetMismatchError
+    elsif !new.changeset.is_open?
+      raise OSM::APIChangesetAlreadyClosedError, new.changeset
+    end
+  end
+
+  # This is similar to above, just some validations don't apply
+  def check_create_consistency(new, user)
+    if new.changeset.nil?
+      raise OSM::APIChangesetMissingError
+    elsif new.changeset.user_id != user.id
+      raise OSM::APIUserChangesetMismatchError
+    elsif !new.changeset.is_open?
+      raise OSM::APIChangesetAlreadyClosedError, new.changeset
+    end
+  end
+
+  ##
+  # subset of consistency checks which should be applied to almost
+  # all the changeset controller's writable methods.
+  def check_changeset_consistency(changeset, user)
+    # check user credentials - only the user who opened a changeset
+    # may alter it.
+    if changeset.nil?
+      raise OSM::APIChangesetMissingError
+    elsif user.id != changeset.user_id
+      raise OSM::APIUserChangesetMismatchError
+    elsif !changeset.is_open?
+      raise OSM::APIChangesetAlreadyClosedError, changeset
+    end
+  end
+end