197 lines
9.0 KiB
Markdown
197 lines
9.0 KiB
Markdown
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---
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stage: Plan
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group: Project Management
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# Work items and work item types
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## Challenges
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Issues have the potential to be a centralized hub for collaboration.
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We need to accept the
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fact that different issue types require different fields and different context, depending
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on what job they are being used to accomplish. For example:
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- A bug needs to list steps to reproduce.
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- An incident needs references to stack traces and other contextual information relevant only
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to that incident.
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Instead of each object type diverging into a separate model, we can standardize on an underlying
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common model that we can customize with the widgets (one or more attributes) it contains.
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Here are some problems with current issues usage and why we are looking into work items:
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- Using labels to show issue types is cumbersome and makes reporting views more complex.
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- Issue types are one of the top two use cases of labels, so it makes sense to provide first class
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support for them.
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- Issues are starting to become cluttered as we add more capabilities to them, and they are not
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perfect:
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- There is no consistent pattern for how to surface relationships to other objects.
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- There is not a coherent interaction model across different types of issues because we use
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labels for this.
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- The various implementations of issue types lack flexibility and extensibility.
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- Epics, issues, requirements, and others all have similar but just subtle enough
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differences in common interactions that the user needs to hold a complicated mental
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model of how they each behave.
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- Issues are not extensible enough to support all of the emerging jobs they need to facilitate.
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- Codebase maintainability and feature development become bigger challenges as we grow the Issue type
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beyond its core role of issue tracking into supporting the different work item types and handling
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logic and structure differences.
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- New functionality is typically implemented with first class objects that import behavior from issues via
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shared concerns. This leads to duplicated effort and ultimately small differences between common interactions. This
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leads to inconsistent UX.
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- Codebase maintainability and feature development becomes a bigger challenges as we grow issues
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beyond its core role of issue tracking into supporting the different types and subtle differences between them.
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## Work item and work item type terms
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Using the terms "issue" or "issuable" to reference the types of collaboration objects
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(for example, issue, bug, feature, or epic) often creates confusion. To avoid confusion, we will use the term
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work item type (WIT) when referring to the type of a collaboration object.
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An instance of a WIT is a work item (WI). For example, `issue#123`, `bug#456`, `requirement#789`.
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### Migration strategy
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WI model will be built on top of the existing `Issue` model and we'll gradually migrate `Issue`
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model code to the WI model.
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One way to approach it is:
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```ruby
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class WorkItems::WorkItem < ApplicationRecord
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self.table_name = 'issues'
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# ... all the current issue.rb code
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end
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class Issue < WorkItems::WorkItem
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# Do not add code to this class add to WorkItems:WorkItem
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end
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```
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We already use the concept of WITs within `issues` table through `issue_type`
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column. There are `issue`, `incident`, and `test_case` issue types. To extend this
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so that in future we can allow users to define custom WITs, we will move the
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`issue_type` to a separate table: `work_item_types`. The migration process of `issue_type`
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to `work_item_types` will involve creating the set of WITs for all root-level groups.
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NOTE:
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At first, defining a WIT will only be possible at the root-level group, which would then be inherited by sub-groups.
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We will investigate the possibility of defining new WITs at sub-group levels at a later iteration.
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### Introducing work_item_types table
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For example, suppose there are three root-level groups with IDs: `11`, `12`, and `13`. Also,
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assume the following base types: `issue: 0`, `incident: 1`, `test_case: 2`.
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The respective `work_item_types` records:
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| `group_id` | `base_type` | `title` |
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| -------------- | ----------- | --------- |
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| 11 | 0 | Issue |
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| 11 | 1 | Incident |
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| 11 | 2 | Test Case |
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| 12 | 0 | Issue |
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| 12 | 1 | Incident |
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| 12 | 2 | Test Case |
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| 13 | 0 | Issue |
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| 13 | 1 | Incident |
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| 13 | 2 | Test Case |
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What we will do to achieve this:
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1. Add a `work_item_type_id` column to the `issues` table.
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1. Ensure we write to both `issues#issue_type` and `issues#work_item_type_id` columns for
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new or updated issues.
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1. Backfill the `work_item_type_id` column to point to the `work_item_types#id` corresponding
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to issue's project root groups. For example:
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```ruby
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issue.project.root_group.work_item_types.where(base_type: issue.issue_type).first.id.
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```
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1. After `issues#work_item_type_id` is populated, we can switch our queries from
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using `issue_type` to using `work_item_type_id`.
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To introduce a new WIT there are two options:
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- Follow the first step of the above process. We will still need to run a migration
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that adds a new WIT for all root-level groups to make the WIT available to
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all users. Besides a long-running migration, we'll need to
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insert several million records to `work_item_types`. This might be unwanted for users
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that do not want or need additional WITs in their workflow.
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- Create an opt-in flow, so that the record in `work_item_types` for specific root-level group
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is created only when a customer opts in. However, this implies a lower discoverability
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of the newly introduced work item type.
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### Work item type widgets
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All WITs will share the same pool of predefined widgets and will be customized by
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which widgets are active on a specific WIT. Every attribute (column or association)
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will become a widget with self-encapsulated functionality regardless of the WIT it belongs to.
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Because any WIT can have any widget, we only need to define which widget is active for a
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specific WIT. So, after switching the type of a specific work item, we display a different set
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of widgets.
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### Widgets metadata
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In order to customize each WIT with corresponding active widgets we will need a data
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structure to map each WIT to specific widgets.
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NOTE:
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The exact structure of the WITs widgets metadata is still to be defined.
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### Custom work item types
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With the WIT widget metadata and the workflow around mapping WIT to specific
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widgets, we will be able to expose custom WITs to the users. Users will be able
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to create their own WITs and customize them with widgets from the predefined pool.
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### Custom widgets
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The end goal is to allow users to define custom widgets and use these custom
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widgets on any WIT. But this is a much further iteration and requires additional
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investigation to determine both data and application architecture to be used.
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## Migrate requirements and epics to work item types
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We'll migrate requirements and epics into work item types, with their own set
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of widgets. To achieve that, we'll migrate data to the `issues` table,
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and we'll keep current `requirements` and `epics` tables to be used as proxies for old references to ensure
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backward compatibility with already existing references.
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### Migrate requirements to work item types
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Currently `Requirement` attributes are a subset of `Issue` attributes, so the migration
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consists mainly of:
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- Data migration.
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- Keeping backwards compatibility at API levels.
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- Ensuring that old references continue to work.
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The migration to a different underlying data structure should be seamless to the end user.
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### Migrate epics to work item types
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`Epic` has some extra functionality that the `Issue` WIT does not currently have.
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So, migrating epics to a work item type requires providing feature parity between the current `Epic` object and WITs.
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The main missing features are:
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- Get WIs to the group level. This is dependent on [Consolidate Groups and Projects](https://gitlab.com/gitlab-org/architecture/tasks/-/issues/7)
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initiative.
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- A hierarchy widget: the ability to structure work items into hierarchies.
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- Inherited date widget.
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To avoid disrupting workflows for users who are already using epics, we will introduce a new WIT
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called `Feature` that will provide feature parity with epics at the project-level. Having that combined with progress
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on [Consolidate Groups and Projects](https://gitlab.com/gitlab-org/architecture/tasks/-/issues/7) front will help us
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provide a smooth migration path of epics to WIT with minimal disruption to user workflow.
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## Work item, work item type, and widgets roadmap
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We will move towards work items, work item types, and custom widgets (CW) in an iterative process.
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For a rough outline of the work ahead of us, see [epic 6033](https://gitlab.com/groups/gitlab-org/-/epics/6033).
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