<p></p>
<p><b>@tomhughes</b> commented on this pull request.</p>
<hr>
<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/6197#discussion_r2206891559">config/initializers/tag2link.rb</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,24 @@
+# A map of each OSM key to its formatter URL. For example:
+# { "ref:vatin" => "https://example.com/$1" }
+TAG2LINK = lambda {
+ # the JSON data is an array with duplicate entries, which is not efficient for lookups.
+ # So, convert it to a hash and only keep the item with the best rank.
+ array = JSON.parse(Rails.root.join("node_modules/tag2link/index.json").read)
+
+ ranks = %w[deprecated normal preferred].freeze
</pre>
<p dir="auto">Do we want to include <code class="notranslate">deprecated</code> at all?</p>
<hr>
<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/6197#discussion_r2206898871">config/initializers/tag2link.rb</a>:</p>
<pre style='color:#555'>> +TAG2LINK = lambda {
+ # the JSON data is an array with duplicate entries, which is not efficient for lookups.
+ # So, convert it to a hash and only keep the item with the best rank.
+ array = JSON.parse(Rails.root.join("node_modules/tag2link/index.json").read)
+
+ ranks = %w[deprecated normal preferred].freeze
+
+ output = {}
+
+ all_keys = array.map { |item| item["key"] }.uniq
+
+ all_keys.each do |key|
+ # for each key, find the item with the best rank
+ best_definition = array
+ .select { |item| item["key"] == key }
+ .max_by { |item| ranks.index(item["rank"]) }
</pre>
<p dir="auto">Unfortunately this is not a stable algorithm as there are keys with more than one entry at the same rank - even more than one <code class="notranslate">preferred</code> in some cases like <code class="notranslate">Key:seamark:radio_station:mmsi</code> so we might get different results for different runs unless we can break the tie somehow.</p>
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