PaperTrail installs a callback in your rails controllers. Because you are unable to control the order of callback execution, this technique is not recommended, but is preserved for backwards compatibility. It would be better to install your own callback and use PaperTrail. The widget. This does not apply to create events.
You could even use PaperTrail to implement an undo system; Ryan Bates has! Note that these methods reify the item for you. If instead you have a particular version of an item you can navigate to the previous and next versions. If you got an item by reifying one of its versions, you can navigate back to the version it came from:. You can find out whether a model instance is the current, live one -- or whether it came instead from a previous version -- with live?
The best way to diff adjacent versions is to get PaperTrail to do it for you. Ignored attributes are omitted. Prior to As of When I designed PaperTrail I wanted simplicity and robustness so I decided to make each version of an object self-contained.
A version stores all of its object's data, not a diff from the previous version. This means you can delete any version without affecting any other. To diff non-adjacent versions you'll have to write your own code. These libraries may help:. Unfortunately, there is no currently widely available and supported library for diffing two ActiveRecord objects.
Over time your versions table will grow to an unwieldy size. Because each version is self-contained see the Diffing section above for more you can simply delete any records you don't want any more. For example:. However, items is a polymorphic relationship. A partial FKC e. If per-table Version classes are used, then a partial FKC is no longer needed. Some applications choose to handle this problem by "soft-deleting" versioned records, i.
This completely prevents id reuse, but adds complexity to the application. In most applications, this is the only known practical solution to the id reuse problem. Set PaperTrail. Because lazy evaluation can be hard to troubleshoot, this is not recommended for common use. To set whodunnit temporarily, for the duration of a block, use PaperTrail.
See also: Setting whodunnit in the rails console. A version's whodunnit column tells us who changed the object, causing the version to be stored. Because a version stores the object as it looked before the change see the table above , whodunnit tells us who stopped the object looking like this -- not who made it look like this.
Hence whodunnit is aliased as terminator. To find out who made a version's object look that way, use version. From to , association tracking was an experimental feature, but many issues were discovered. Even though it had always been an experimental feature, we didn't want the extraction of PT-AT to be a breaking change, so great care was taken to remove it slowly.
You can add your own custom columns to your versions table. Values can be given using Model Metadata or Controller Metadata. You can also store any information you like from your controller. Why would you do this? But let's say you wanted to pull out all versions for a particular author; without the metadata you would have to deserialize reify each version object to see if belonged to the author in question.
Clearly this is inefficient. Using the metadata you can find just those versions you want:. Experts only. Metadata will override the normal values that PT would have inserted into its own columns. PaperTrail supports Single Table Inheritance , and even supports an un-versioned base model, as of 23ffbdc7e1. You may configure the name of the versions association by passing a different name default is :versions in the versions: options hash:.
You may pass a scope to the versions association with the scope: option:. Overriding instead of configuring the versions method is not supported. Overriding associations is not recommended in general. The item association is first defined in PaperTrail::VersionConcern , but associations can be redefined. When redefining an association, its options are replaced not merged , so don't forget to specify the options from PaperTrail::VersionConcern , like polymorphic.
It writes, but does not run, a migration file. The migration creates the versions table. If you are still using them, you may use PT 5 or lower. Foo::BarVersion if your class is inside the module Foo. If you are using Postgres, you should also define the sequence that your custom version class will use:.
If you only use custom version classes and don't have a versions table, you must let ActiveRecord know that your base version class eg. You can also specify custom names for the versions and version associations. You can override this with the serializer config option:. A valid serializer is a module or class that defines a load and dump method.
These serializers are included in the gem for your convenience:. The first slow option is to loop over every record and parse it in Ruby, then write to a temporary column:. This technique can be very slow if you have a lot of data. Though slow, it is safe in databases where transactions are protected against DDL, such as Postgres. In databases without such protection, such as MySQL, a table lock may be necessary. If the above technique is too slow for your needs, and you're okay doing without PaperTrail data temporarily, you can create the new column without converting the data.
If your object column already contains JSON data, and you want to change its data type to json or jsonb , you can use the following DDL. You should only use this feature if you are comfortable reading PT's source to see exactly how the adapter is used. The object column ends up storing a lot of duplicate data if you have models that have many columns, and that are updated many times.
You may want to turn PaperTrail off to speed up your tests. It was one of dozens of shunts placed on the tracks last year, apparently to slow the delivery of oil and supplies in protest of a natural gas pipeline across through Indigenous land in British Columbia.
Opponents say the mile kilometer Coastal GasLink Pipeline Project will worsen environmental damage. On Oct. They triggered an automatic braking system on a train that was transporting hazardous material, causing a portion of the train to decouple from the engine — risking a derailment of tanker cars of flammable gas in a residential area, prosecutors said. On Dec. No injuries were reported, but the fire sent a large plume of black smoke into the sky about miles kilometers north of Seattle, and people were evacuated from a half-mile radius.
About 29, gallons of petroleum crude oil spilled from three of the tank cars. Brooks and Reiche each face up to 20 years in prison, though as part of Brooks' plea deal the government agreed to recommend a sentence at the low end of her guideline range as determined by the U. Sign up for a free plan. Papertrail consolidates syslog events to a single cloud location, allowing you to access messages from a central interface.
The Papertrail event viewer filters through the syslog messages in real time. Start Free Trial. Make Your Logs Work for You The days of logging in to servers and manually viewing log files are over.
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