Remove the `ForkedProjectLink` model

This removes the `ForkedProjectLink` model that has been replaced by
the `ForkNetworkMember` and `ForkNetwork` combination. All existing
relations have been adjusted to use these new models.

The `forked_project_link` table has been dropped.

The "Forks" count on the admin dashboard has been updated to count all
`ForkNetworkMember` rows and deduct the number of `ForkNetwork`
rows. This is because now the "root-project" of a fork network also
has a `ForkNetworkMember` row. This count could become inaccurate when
the root of a fork network is deleted.

1 files changed, 14 insertions, 0 deletions

diff --git a/app/helpers/count_helper.rb b/app/helpers/count_helper.rb
index e16223a82c9..13839474e1f 100644
--- a/app/helpers/count_helper.rb
+++ b/app/helpers/count_helper.rb
@@ -8,4 +8,18 @@ module CountHelper
 
     number_with_delimiter(count)
   end
+
+  # This will approximate the fork count by checking all counting all fork network
+  # memberships, and deducting 1 for each root of the fork network.
+  # This might be inacurate as the root of the fork network might have been deleted.
+  #
+  # This makes querying this information a lot more effecient and it should be
+  # accurate enough for the instance wide statistics
+  def approximate_fork_count_with_delimiters(count_data)
+    fork_network_count = count_data[ForkNetwork]
+    fork_network_member_count = count_data[ForkNetworkMember]
+    approximate_fork_count = fork_network_member_count - fork_network_count
+
+    number_with_delimiter(approximate_fork_count)
+  end
 end