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TLDR: always return an object that responds to the query methods from
request.format, and do not touch Mime::Type[] lookup to avoid bugs.
---
Long version:
The initial issue was about being able to do checks like
request.format.html? for request with an unknown format, where
request.format would be nil.
This is where the issue came from at first in #7837 and #8085
(merged in cba05887dc3b56a46a9fe2779b6b228880b49622), but the
implementation went down the path of adding this to the mime type
lookup logic.
This unfortunately introduced subtle bugs, for instance in the merged
commit a test related to send_file had to be changed to accomodate the
introduction of the NullType.
Later another bug was found in #13064, related to the content-type being
shown as #<Mime::NullType:...> for templates with localized extensions
but no format included. This one was fixed in #13133, merged in
43962d6ec50f918c9970bd3cd4b6ee5c7f7426ed.
Besides that, custom handlers were not receiving the proper template
formats anymore when passing through the rendering process, because of
the NullType addition. That was found while migrating an application
from 3.2 to 4.0 that uses the Markerb gem (a custom handler that
generates both text and html emails from a markdown template).
---
This changes the implementation moving away from returning this null
object from the mime lookup, and still fixes the initial issue where
request.format.zomg? would raise an exception for unknown formats due to
request.format being nil.
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Avoid one-liner conditionals when they are too big. Avoid concatenating
strings to build error messages. Improve messages a bit.
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By default, variants in the templates will be picked up if a variant is set
and there's a match. The format will be:
app/views/projects/show.html.erb
app/views/projects/show.html+tablet.erb
app/views/projects/show.html+phone.erb
If request.variant = :tablet is set, we'll automatically be rendering the
html+tablet template.
In the controller, we can also tailer to the variants with this syntax:
class ProjectsController < ActionController::Base
def show
respond_to do |format|
format.html do |html|
@stars = @project.stars
html.tablet { @notifications = @project.notifications }
html.phone { @chat_heads = @project.chat_heads }
end
format.js
format.atom
end
end
end
The variant itself is nil by default, but can be set in before filters, like
so:
class ApplicationController < ActionController::Base
before_action do
if request.user_agent =~ /iPad/
request.variant = :tablet
end
end
end
This is modeled loosely on custom mime types, but it's specifically not
intended to be used together. If you're going to make a custom mime type,
you don't need a variant. Variants are for variations on a single mime
types.
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Fix ActionDispatch::Request#formats on xhr requests when HTTP_ACCEPT
header is empty string. About issue #7774, same fix as in commit bebb02f
but for xhr requests.
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in a prioritized order
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requests. Closes #2119
An xhr request must have an "Accept" or "Content-type" header in order to be considered a request with valid_accept_header.
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Signed-off-by: José Valim <jose.valim@gmail.com>
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leading */* and comma
Signed-off-by: José Valim <jose.valim@gmail.com>
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has ....,*/* .
It is possible to a device to send
request such that */* appear at the beginning of the
"Accept" header. This patch ensures that "Accept" header
is ignored for such cases too.
Signed-off-by: José Valim <jose.valim@gmail.com>
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application/json, application/jsonp (and the like), but still blacklists browsers. Essentially, we use normal content negotiation unless you include */* in your list, in which case we assume you're a browser and send HTML [#3541 state:resolved]
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Rack::Request expect
it to return a String. Split the Rails API so that Request#content_type returns
a String, and Request#content_mime_type returns a Mime::Type object.
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