Commit 4daf0c76 authored by Samyak Jain's avatar Samyak Jain

Update README.md

parent c408f973
......@@ -8,7 +8,7 @@ methods from models to presenters.
### When your view is full of logic
When your view is full of logic (`if`, `else`, `select` on arrays etc.), it's
When your view is full of logic (`if`, `else`, `select` on arrays, etc.), it's
time to create a presenter!
### When your model has a lot of view-related logic/data methods
......@@ -27,11 +27,11 @@ Presenters should be used for:
https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/7073/diffs.
- Data and logic methods that can be pulled from models.
- Simple text output methods: it's ok if the method returns a string, but not a
whole DOM element for which we'd need HAML, a view context, helpers etc.
whole DOM element for which we'd need HAML, a view context, helpers, etc.
## Why use presenters instead of model concerns?
We should strive to follow the single-responsibility principle, and view-related
We should strive to follow the single-responsibility principle and view-related
logic/data methods are definitely not the responsibility of models!
Another reason is as follows:
......@@ -52,22 +52,22 @@ we gain the following benefits:
- rules are more explicit and centralized in the presenter => improves security
- testing is easier and faster as presenters are Plain Old Ruby Object (PORO)
- views are more readable and maintainable
- decreases number of CE -> EE merge conflicts since code is in separate files
- decreases the number of CE -> EE merge conflicts since code is in separate files
- moves the conflicts from views (not always obvious) to presenters (a lot easier to resolve)
## What not to do with presenters?
- Don't use helpers in presenters. Presenters are not aware of the view context.
- Don't generate complex DOM elements, forms etc. with presenters. Presenters
can return simple data as texts, and URLs using URL helpers from
`Gitlab::Routing` but nothing much more fancy.
- Don't generate complex DOM elements, forms, etc. with presenters. Presenters
can return simple data like texts, and URLs using URL helpers from
`Gitlab::Routing` but nothing much fancier.
## Implementation
### Presenter definition
Every presenter should inherit from `Gitlab::View::Presenter::Simple`, which
provides a `.presents` method which allows you to define an accessor for the
provides a `.presents` the method which allows you to define an accessor for the
presented object. It also includes common helpers like `Gitlab::Routing` and
`Gitlab::Allowable`.
......
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