265 lines
10 KiB
Ruby
265 lines
10 KiB
Ruby
require 'active_support/concern'
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module PaperTrail
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module VersionConcern
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extend ::ActiveSupport::Concern
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included do
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belongs_to :item, :polymorphic => true
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validates_presence_of :event
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attr_accessible :item_type, :item_id, :event, :whodunnit, :object, :object_changes, :created_at if PaperTrail.active_record_protected_attributes?
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after_create :enforce_version_limit!
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end
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module ClassMethods
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def with_item_keys(item_type, item_id)
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where :item_type => item_type, :item_id => item_id
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end
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def creates
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where :event => 'create'
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end
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def updates
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where :event => 'update'
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end
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def destroys
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where :event => 'destroy'
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end
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def not_creates
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where 'event <> ?', 'create'
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end
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# Expects `obj` to be an instance of `PaperTrail::Version` by default, but can accept a timestamp if
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# `timestamp_arg` receives `true`
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def subsequent(obj, timestamp_arg = false)
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if timestamp_arg != true && self.primary_key_is_int?
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return where(arel_table[primary_key].gt(obj.id)).order(arel_table[primary_key].asc)
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end
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obj = obj.send(PaperTrail.timestamp_field) if obj.is_a?(self)
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where(arel_table[PaperTrail.timestamp_field].gt(obj)).order(self.timestamp_sort_order)
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end
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def preceding(obj, timestamp_arg = false)
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if timestamp_arg != true && self.primary_key_is_int?
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return where(arel_table[primary_key].lt(obj.id)).order(arel_table[primary_key].desc)
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end
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obj = obj.send(PaperTrail.timestamp_field) if obj.is_a?(self)
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where(arel_table[PaperTrail.timestamp_field].lt(obj)).order(self.timestamp_sort_order('desc'))
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end
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def between(start_time, end_time)
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where(
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arel_table[PaperTrail.timestamp_field].gt(start_time).
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and(arel_table[PaperTrail.timestamp_field].lt(end_time))
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).order(self.timestamp_sort_order)
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end
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# defaults to using the primary key as the secondary sort order if possible
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def timestamp_sort_order(direction = 'asc')
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[arel_table[PaperTrail.timestamp_field].send(direction.downcase)].tap do |array|
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array << arel_table[primary_key].send(direction.downcase) if self.primary_key_is_int?
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end
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end
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# Performs an attribute search on the serialized object by invoking the
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# identically-named method in the serializer being used.
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def where_object(args = {})
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raise ArgumentError, 'expected to receive a Hash' unless args.is_a?(Hash)
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arel_field = arel_table[:object]
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where_conditions = args.map do |field, value|
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PaperTrail.serializer.where_object_condition(arel_field, field, value)
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end.reduce do |condition1, condition2|
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condition1.and(condition2)
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end
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where(where_conditions)
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end
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def primary_key_is_int?
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@primary_key_is_int ||= columns_hash[primary_key].type == :integer
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rescue
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true
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end
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# Returns whether the `object` column is using the `json` type supported by PostgreSQL
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def object_col_is_json?
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@object_col_is_json ||= columns_hash['object'].type == :json
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end
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# Returns whether the `object_changes` column is using the `json` type supported by PostgreSQL
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def object_changes_col_is_json?
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@object_changes_col_is_json ||= columns_hash['object_changes'].type == :json
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end
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end
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# Restore the item from this version.
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#
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# This will automatically restore all :has_one associations as they were "at the time",
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# if they are also being versioned by PaperTrail. NOTE: this isn't always guaranteed
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# to work so you can either change the lookback period (from the default 3 seconds) or
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# opt out.
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#
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# Options:
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# :has_one set to `false` to opt out of has_one reification.
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# set to a float to change the lookback time (check whether your db supports
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# sub-second datetimes if you want them).
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# :dup `false` default behavior
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# `true` it always create a new object instance. It is useful for comparing two versions of the same object
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def reify(options = {})
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return nil if object.nil?
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without_identity_map do
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options[:has_one] = 3 if options[:has_one] == true
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options.reverse_merge! :has_one => false
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attrs = self.class.object_col_is_json? ? object : PaperTrail.serializer.load(object)
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# Normally a polymorphic belongs_to relationship allows us
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# to get the object we belong to by calling, in this case,
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# `item`. However this returns nil if `item` has been
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# destroyed, and we need to be able to retrieve destroyed
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# objects.
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#
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# In this situation we constantize the `item_type` to get hold of
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# the class...except when the stored object's attributes
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# include a `type` key. If this is the case, the object
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# we belong to is using single table inheritance and the
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# `item_type` will be the base class, not the actual subclass.
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# If `type` is present but empty, the class is the base class.
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if item && options[:dup] != true
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model = item
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# Look for attributes that exist in the model and not in this version. These attributes should be set to nil.
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(model.attribute_names - attrs.keys).each { |k| attrs[k] = nil }
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else
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inheritance_column_name = item_type.constantize.inheritance_column
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class_name = attrs[inheritance_column_name].blank? ? item_type : attrs[inheritance_column_name]
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klass = class_name.constantize
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model = klass.new
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end
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model.class.unserialize_attributes_for_paper_trail attrs
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# Set all the attributes in this version on the model
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attrs.each do |k, v|
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if model.has_attribute?(k)
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model[k.to_sym] = v
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else
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logger.warn "Attribute #{k} does not exist on #{item_type} (Version id: #{id})."
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end
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end
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model.send "#{model.class.version_association_name}=", self
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unless options[:has_one] == false
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reify_has_ones model, options[:has_one]
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end
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model
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end
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end
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# Returns what changed in this version of the item. Cf. `ActiveModel::Dirty#changes`.
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# Returns `nil` if your `versions` table does not have an `object_changes` text column.
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def changeset
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return nil unless self.class.column_names.include? 'object_changes'
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_changes = self.class.object_changes_col_is_json? ? object_changes : PaperTrail.serializer.load(object_changes)
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@changeset ||= HashWithIndifferentAccess.new(_changes).tap do |changes|
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item_type.constantize.unserialize_attribute_changes(changes)
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end
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rescue
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{}
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end
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# Returns who put the item into the state stored in this version.
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def originator
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@originator ||= previous.whodunnit rescue nil
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end
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# Returns who changed the item from the state it had in this version.
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# This is an alias for `whodunnit`.
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def terminator
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@terminator ||= whodunnit
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end
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alias_method :version_author, :terminator
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def sibling_versions(reload = false)
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@sibling_versions = nil if reload == true
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@sibling_versions ||= self.class.with_item_keys(item_type, item_id)
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end
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def next
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@next ||= sibling_versions.subsequent(self).first
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end
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def previous
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@previous ||= sibling_versions.preceding(self).first
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end
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def index
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table = self.class.arel_table unless @index
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@index ||=
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if self.class.primary_key_is_int?
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sibling_versions.select(table[self.class.primary_key]).order(table[self.class.primary_key].asc).index(self)
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else
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sibling_versions.select([table[PaperTrail.timestamp_field], table[self.class.primary_key]]).
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order(self.class.timestamp_sort_order).index(self)
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end
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end
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private
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# In Rails 3.1+, calling reify on a previous version confuses the
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# IdentityMap, if enabled. This prevents insertion into the map.
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def without_identity_map(&block)
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if defined?(::ActiveRecord::IdentityMap) && ::ActiveRecord::IdentityMap.respond_to?(:without)
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::ActiveRecord::IdentityMap.without(&block)
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else
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block.call
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end
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end
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# Restore the `model`'s has_one associations as they were when this version was
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# superseded by the next (because that's what the user was looking at when they
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# made the change).
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#
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# The `lookback` sets how many seconds before the model's change we go.
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def reify_has_ones(model, lookback)
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model.class.reflect_on_all_associations(:has_one).each do |assoc|
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child = model.send assoc.name
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if child.respond_to? :version_at
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# N.B. we use version of the child as it was `lookback` seconds before the parent was updated.
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# Ideally we want the version of the child as it was just before the parent was updated...
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# but until PaperTrail knows which updates are "together" (e.g. parent and child being
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# updated on the same form), it's impossible to tell when the overall update started;
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# and therefore impossible to know when "just before" was.
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if (child_as_it_was = child.version_at(send(PaperTrail.timestamp_field) - lookback.seconds))
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child_as_it_was.attributes.each do |k,v|
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model.send(assoc.name).send :write_attribute, k.to_sym, v rescue nil
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end
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else
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model.send "#{assoc.name}=", nil
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end
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end
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end
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end
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# checks to see if a value has been set for the `version_limit` config option, and if so enforces it
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def enforce_version_limit!
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return unless PaperTrail.config.version_limit.is_a? Numeric
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previous_versions = sibling_versions.not_creates
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return unless previous_versions.size > PaperTrail.config.version_limit
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excess_previous_versions = previous_versions - previous_versions.last(PaperTrail.config.version_limit)
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excess_previous_versions.map(&:destroy)
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end
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end
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end
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