Extract Aggregations Class

app/models/aggregations.rb

@@ -0,0 +1,84 @@
+class Aggregations
+  # https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html
+  def self.all
+    {
+      contributors:,
+      content_type:,
+      content_format:,
+      languages:,
+      literary_form:,
+      source:,
+      subjects:
+    }
+  end
+
+  def self.contributors
+    {
+      nested: {
+        path: 'contributors'
+      },
+      aggs: {
+        contributor_names: {
+          terms: {
+            field: 'contributors.value.keyword'
+          }
+        }
+      }
+    }
+  end
+
+  def self.content_type
+    {
+      terms: {
+        field: 'content_type'
+      }
+    }
+  end
+
+  def self.content_format
+    {
+      terms: {
+        field: 'format'
+      }
+    }
+  end
+
+  def self.languages
+    {
+      terms: {
+        field: 'languages.keyword'
+      }
+    }
+  end
+
+  def self.literary_form
+    {
+      terms: {
+        field: 'literary_form'
+      }
+    }
+  end
+
+  def self.source
+    {
+      terms: {
+        field: 'source'
+      }
+    }
+  end
+
+  def self.subjects
+    {
+      nested: {
+        path: 'subjects'
+      },
+      aggs: {
+        subject_names: {
+          terms: {
+            field: 'subjects.value.keyword'
+          }
+        }
+      }
+    }
+  end
+end

app/models/opensearch.rb

@@ -20,7 +20,7 @@ def build_query(from)
       from:,
       size: SIZE,
       query:,
-      aggregations:,
+      aggregations: Aggregations.all,
       sort:
     }
 
@@ -245,61 +245,6 @@ def source_array(param)
     sources
   end
 
-  # https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html
-  def aggregations
-    {
-      contributors: {
-        nested: {
-          path: 'contributors'
-        },
-        aggs: {
-          contributor_names: {
-            terms: {
-              field: 'contributors.value.keyword'
-            }
-          }
-        }
-      },
-      content_type: {
-        terms: {
-          field: 'content_type'
-        }
-      },
-      content_format: {
-        terms: {
-          field: 'format'
-        }
-      },
-      languages: {
-        terms: {
-          field: 'languages.keyword'
-        }
-      },
-      literary_form: {
-        terms: {
-          field: 'literary_form'
-        }
-      },
-      source: {
-        terms: {
-          field: 'source'
-        }
-      },
-      subjects: {
-        nested: {
-          path: 'subjects'
-        },
-        aggs: {
-          subject_names: {
-            terms: {
-              field: 'subjects.value.keyword'
-            }
-          }
-        }
-      }
-    }
-  end
-
   private
 
   def match_single_field(field, match_array)