feat(APIv2): RHINENG-11754 filter systems by policy ID

app/models/v2/system.rb

@@ -95,6 +95,13 @@ def self.first_group_name(table = arel_table)
       { conditions: systems.arel.where_sql.gsub(/^where /i, '') }
     end
 
+    searchable_by :policies, %i[eq in] do |_key, _op, val|
+      values = val.split.map(&:strip)
+      ids = ::V2::PolicySystem.where(policy_id: values).select(:system_id)
+
+      { conditions: "inventory.hosts.id IN (#{ids.to_sql})" }
+    end
+
     scope :with_groups, lambda { |groups, key = :id|
       # Skip the [] representing ungrouped hosts from the array when generating the query
       grouped = arel_inventory_groups(groups.flatten, key, arel_table)

spec/fixtures/files/searchable/systems_controller.yaml

@@ -314,3 +314,44 @@
         :account: ${account}
         :policy_id: ${policy.id}
   :query: (group_name ^ "one,two")
+
+- :name: "equality search by policies"
+  :entities:
+    :found:
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_7.id}
+        :os_minor_version: 1
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_7.id}
+        :os_minor_version: 1
+    :not_found:
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_8.id}
+        :os_minor_version: 1
+  :query: (policies = ${policy_7.id})
+  :except_parents:
+    - :policies
+    - :reports
+- :name: "in search by policies"
+  :entities:
+    :found:
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_7.id}
+        :os_minor_version: 1
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_8.id}
+        :os_minor_version: 1
+    :not_found:
+      - :factory: :system
+        :account: ${account}
+        :policy_id: ${policy_9.id}
+        :os_minor_version: 1
+  :query: (policies ^ "${policy_7.id} ${policy_8.id}")
+  :except_parents:
+    - :policies
+    - :reports