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fast count #115

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merged 1 commit into from Apr 12, 2021
Merged

fast count #115

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16 changes: 8 additions & 8 deletions app/views/admin/dashboard/index.html.erb
View file
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Expand Up @@ -10,7 +10,7 @@
Total Bookmarks
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Bookmark.count %>
<%= FastCount.new(Bookmark.all).call %>
</dd>
</dl>
</div>
Expand All @@ -22,7 +22,7 @@
Total Users
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= User.count %>
<%= FastCount.new(User.all).call %>
</dd>
</dl>
</div>
Expand All @@ -35,7 +35,7 @@
Total Tags
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Tag.count %>
<%= FastCount.new(Tag.all).call %>
</dd>
</dl>
</div>
Expand All @@ -48,7 +48,7 @@
Total Likes
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Like.count %>
<%= FastCount.new(Like.all).call %>
</dd>
</dl>
</div>
Expand All @@ -61,7 +61,7 @@
Total Clicks
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Click.count %>
<%= FastCount.new(Click.all).call %>
</dd>
</dl>
</div>
Expand All @@ -74,7 +74,7 @@
Total Comments
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Comment.count %>
<%= FastCount.new(Comment.all).call %>
</dd>
</dl>
</div>
Expand All @@ -87,7 +87,7 @@
Total Follows
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= Follow.count %>
<%= FastCount.new(Follow.all).call %>
</dd>
</dl>
</div>
Expand All @@ -100,7 +100,7 @@
Total Subscriptions
</dt>
<dd class="mt-1 text-3xl leading-9 font-semibold text-gray-900">
<%= TagSubscription.count %>
<%= FastCount.new(TagSubscription.all).call %>
</dd>
</dl>
</div>
Expand Down
23 changes: 23 additions & 0 deletions config/initializers/fast_count.rb
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@@ -0,0 +1,23 @@
# frozen_string_literal: true

# usage
# FastCount.new(User.all).call
# => 826
# FastCount.new(User.where("id > 200")).call
# => 665

class FastCount
attr_reader :scope, :sql

def initialize(scope)
@scope = scope
@sql = scope.to_sql
end

def call
explain_sql = "explain (format json) #{sql}"
result = ApplicationRecord.connection.execute(explain_sql)[0]["QUERY PLAN"]
json = JSON.parse(result)
json[0]["Plan"]["Plan Rows"].to_i
end
end