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Update docs on verified routes and ExDoc
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josevalim committed Feb 1, 2025
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33 changes: 31 additions & 2 deletions lib/phoenix/verified_routes.ex
Original file line number Diff line number Diff line change
Expand Up @@ -30,8 +30,7 @@ defmodule Phoenix.VerifiedRoutes do
use `~p"/posts/#{post}"` rather than `~p"/posts/#{post.slug}"` throughout your
application. See the `Phoenix.Param` documentation for more details.
Query strings are also supported in verified routes, either in traditional query
string form:
Finally, query strings are also supported in verified routes, either in traditional form:
~p"/posts?page=#{page}"
Expand All @@ -43,6 +42,36 @@ defmodule Phoenix.VerifiedRoutes do
Like path segments, query strings params are proper URL encoded and may be interpolated
directly into the ~p string.
## What about named routes?
Many web frameworks, and early versions of Phoenix, provided a feature called "named routes".
The idea is that, when you define routes in your web applications, you could give them names
too. In Phoenix that was done as follows:
get "/login", SessionController, :create, as: :login
And now you could generate the route usnig the `login_path` function.
Named routes exist to avoid hardcoding routes in your templates, if you wrote `<a href="/login">`
and then changed your router, the link would point to a page that no longer exist. By using
`login_path`, we make sure it always points to a valid URL in our router. However, named routes
come with the downsides of indirection: when you look at the code, it is not immediately clear
which URL will be generated. Furthermore, if you have an existing URL and you want to add it
to a template, you need to do a reverse lookup and find its name in the router. At the end of
the day, named routes are arbitrary names that need to be memorized by developers, adding
cognitive overhead.
Verified routes tackle this problem by allowing the routes to be written as we would read them
in a browser, but using the `~p` sigil to guarantee they actually exist at compilation time.
They remove the indirection of named routes while keeping their guarantees.
In any case, if part of your application requires features similar to named routes, then
remember you can still leverage Elixir features to achieve the same result. For example,
you can define several functions as named routes to be reused across modules:
def login_path, do: ~p"/login"
def user_home_path(user), do: ~p"/users/#{user.username}"
## Options
To verify routes in your application modules, such as controller, templates, and views,
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8 changes: 4 additions & 4 deletions mix.lock
Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,11 @@
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"expo": {:hex, :expo, "1.1.0", "f7b9ed7fb5745ebe1eeedf3d6f29226c5dd52897ac67c0f8af62a07e661e5c75", [:mix], [], "hexpm", "fbadf93f4700fb44c331362177bdca9eeb8097e8b0ef525c9cc501cb9917c960"},
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Expand All @@ -18,14 +18,14 @@
"makeup_diff": {:hex, :makeup_diff, "0.1.1", "01498f8c95970081297837eaf4686b6f3813e535795b8421f15ace17a59aea37", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "fadb0bf014bd328badb7be986eadbce1a29955dd51c27a9e401c3045cf24184e"},
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