feat: add utilities to state collection

src/common/BaseSharedState.js

@@ -437,12 +437,12 @@ ${JSON.stringify(initValues, null, 2)}`);
   }
 
   /**
-   * Get the schema from which the state has been created.
+   * Definition of schema from which the state has been created.
    *
-   * @param {string} [name=null] - If given, returns only the definition corresponding
-   *  to the given param name.
+   * @param {string} [name=null] - If given, returns only the definition
+   *  corresponding to the given param name.
    * @throws Throws if `name` does not correspond to an existing field
-   *  of the state.
+   *  of the schema.
    * @return {object}
    * @example
    * const schema = state.getSchema();

src/common/BaseSharedStateCollection.js

@@ -62,19 +62,38 @@ class BaseSharedStateCollection {
   }
 
   /**
-   * Detach from the collection, i.e. detach all underlying shared states.
-   * @type {number}
+   * Name of the schema from which the collection has been created.
+   * @type {String}
+   * @readonly
    */
-  async detach() {
-    this._unobserve();
-    this._onUpdateCallbacks.clear();
-
-    await this._controller.delete();
+  get schemaName() {
+    return this._controller.schemaName;
+  }
 
-    const promises = this._states.map(state => state.detach());
-    await Promise.all(promises);
+  /**
+   * Definition of schema from which the collection has been created.
+   *
+   * @param {string} [name=null] - If given, returns only the definition
+   *  corresponding to the given param name.
+   * @throws Throws if `name` does not correspond to an existing field
+   *  of the schema.
+   * @return {object}
+   * @example
+   * const schema = collection.getSchema();
+   */
+  getSchema(name = null) {
+    return this._controller.getSchema(name);
+  }
 
-    this._onDetachCallbacks.clear();
+  /**
+   * Get the default values as declared in the schema.
+   *
+   * @return {object}
+   * @example
+   * const defaults = state.getDefaults();
+   */
+  getDefaults() {
+    return this._controller.getDefaults();
   }
 
   /**
@@ -169,6 +188,22 @@ class BaseSharedStateCollection {
     return () => this._onDetachCallbacks.delete(callback);
   }
 
+  /**
+   * Detach from the collection, i.e. detach all underlying shared states.
+   * @type {number}
+   */
+  async detach() {
+    this._unobserve();
+    this._onUpdateCallbacks.clear();
+
+    await this._controller.delete();
+
+    const promises = this._states.map(state => state.detach());
+    await Promise.all(promises);
+
+    this._onDetachCallbacks.clear();
+  }
+
   /**
    * Execute the given function once for each states of the collection (see `Array.forEach`).
    *

tests/states/StateCollection.spec.js

@@ -156,6 +156,67 @@ describe(`# SharedStateCollection`, () => {
     });
   });
 
+  describe(`## schemaName`, () => {
+    it(`should return the schema name`, async () => {
+      const collection = await clients[0].stateManager.getCollection('a');
+      const schemaName = collection.schemaName;
+      assert.equal(schemaName, 'a')
+
+      await collection.detach();
+    });
+  });
+
+  describe(`## getSchema()`, () => {
+    it(`should return the schema name`, async () => {
+      const collection = await clients[0].stateManager.getCollection('a');
+      const schema = collection.getSchema();
+      const expected = {
+        "bool": {
+          "default": false,
+          "event": false,
+          "filterChange": true,
+          "immediate": false,
+          "initValue": false,
+          "metas": {},
+          "nullable": false,
+          "type": "boolean",
+        },
+        "int": {
+          "default": 0,
+          "event": false,
+          "filterChange": true,
+          "immediate": false,
+          "initValue": 0,
+          "max": 100,
+          "metas": {},
+          "min": 0,
+          "nullable": false,
+          "step": 1,
+          "type": "integer",
+        },
+      };
+
+      assert.deepEqual(schema, expected);
+
+      await collection.detach();
+    });
+  });
+
+  describe(`## getDefaults()`, () => {
+    it(`should return the schema name`, async () => {
+      const collection = await clients[0].stateManager.getCollection('a');
+      const defaults = collection.getDefaults();
+      const expected = {
+        bool: false,
+        int: 0,
+      };
+
+      assert.deepEqual(defaults, expected);
+
+      await collection.detach();
+    });
+  });
+
   describe(`## set(updates, context = null)`, () => {
     it(`should properly progate updates`, async () => {
       const state0 = await clients[0].stateManager.create('a');