1 files changed, 17 insertions, 0 deletions
diff --git a/packages/gitbook-core/src/models/SummaryPart.js b/packages/gitbook-core/src/models/SummaryPart.js
new file mode 100644
index 0000000..89c76d4
--- /dev/null
+++ b/packages/gitbook-core/src/models/SummaryPart.js
@@ -0,0 +1,17 @@
+const { Record, List } = require('immutable');
+const SummaryArticle = require('./SummaryArticle');
+
+class SummaryPart extends Record({
+    title:    '',
+    articles: List()
+}) {
+    constructor(state) {
+        super({
+            ...state,
+            articles: (new List(state.articles))
+                .map(article => new SummaryArticle(article))
+        });
+    }
+}
+
+module.exports = SummaryPart;