1 files changed, 29 insertions, 0 deletions
diff --git a/lib/gitlab/database/postgres_constraint.rb b/lib/gitlab/database/postgres_constraint.rb
new file mode 100644
index 00000000000..fa590914332
--- /dev/null
+++ b/lib/gitlab/database/postgres_constraint.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Database
+    # Backed by the postgres_constraints view
+    class PostgresConstraint < SharedModel
+      IDENTIFIER_REGEX = /^\w+\.\w+$/.freeze
+      self.primary_key = :oid
+
+      scope :check_constraints, -> { where(constraint_type: 'c') }
+      scope :primary_key_constraints, -> { where(constraint_type: 'p') }
+      scope :unique_constraints, -> { where(constraint_type: 'u') }
+      scope :primary_or_unique_constraints, -> { where(constraint_type: %w[u p]) }
+
+      scope :including_column, ->(column) { where("? = ANY(column_names)", column) }
+      scope :not_including_column, ->(column) { where.not("? = ANY(column_names)", column) }
+
+      scope :valid, -> { where(constraint_valid: true) }
+
+      scope :by_table_identifier, ->(identifier) do
+        unless identifier =~ IDENTIFIER_REGEX
+          raise ArgumentError, "Table name is not fully qualified with a schema: #{identifier}"
+        end
+
+        where(table_identifier: identifier)
+      end
+    end
+  end
+end