discourse/app/views/common/_discourse_stylesheet.html.erb
Alan Guo Xiang Tan 8e3691d537 PERF: Eager load Theme associations in Stylesheet Manager.
Before this change, calling `StyleSheet::Manager.stylesheet_details`
for the first time resulted in multiple queries to the database. This is
because the code was modelled in a way where each `Theme` was loaded
from the database one at a time.

This PR restructures the code such that it allows us to load all the
theme records in a single query. It also allows us to eager load the
required associations upfront. In order to achieve this, I removed the
support of loading multiple themes per request. It was initially added
to support user selectable theme components but the feature was never
completed and abandoned because it wasn't a feature that we thought was
worth building.
2021-06-21 11:06:58 +08:00

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<%= discourse_color_scheme_stylesheets %>
<%- if rtl? %>
<%= discourse_stylesheet_link_tag(mobile_view? ? :mobile_rtl : :desktop_rtl) %>
<%- else %>
<%= discourse_stylesheet_link_tag(mobile_view? ? :mobile : :desktop) %>
<%- end %>
<%- if staff? %>
<%= discourse_stylesheet_link_tag(:admin) %>
<%- end %>
<%- Discourse.find_plugin_css_assets(include_official: allow_plugins?, include_unofficial: allow_third_party_plugins?, mobile_view: mobile_view?, desktop_view: !mobile_view?, request: request).each do |file| %>
<%= discourse_stylesheet_link_tag(file) %>
<%- end %>
<%- if theme_id.present? %>
<%= discourse_stylesheet_link_tag(mobile_view? ? :mobile_theme : :desktop_theme) %>
<%- end %>