init source

node_modules/sequelize/lib/model-manager.js

@@ -0,0 +1,98 @@
+'use strict';
+
+const Toposort = require('toposort-class');
+const _ = require('lodash');
+
+class ModelManager {
+  constructor(sequelize) {
+    this.models = [];
+    this.sequelize = sequelize;
+  }
+
+  addModel(model) {
+    this.models.push(model);
+    this.sequelize.models[model.name] = model;
+
+    return model;
+  }
+
+  removeModel(modelToRemove) {
+    this.models = this.models.filter(model => model.name !== modelToRemove.name);
+
+    delete this.sequelize.models[modelToRemove.name];
+  }
+
+  getModel(against, options) {
+    options = _.defaults(options || {}, {
+      attribute: 'name'
+    });
+
+    return this.models.find(model => model[options.attribute] === against);
+  }
+
+  get all() {
+    return this.models;
+  }
+
+  /**
+   * Iterate over Models in an order suitable for e.g. creating tables.
+   * Will take foreign key constraints into account so that dependencies are visited before dependents.
+   *
+   * @param {Function} iterator method to execute on each model
+   * @param {Object} [options] iterator options
+   * @private
+   */
+  forEachModel(iterator, options) {
+    const models = {};
+    const sorter = new Toposort();
+    let sorted;
+    let dep;
+
+    options = _.defaults(options || {}, {
+      reverse: true
+    });
+
+    for (const model of this.models) {
+      let deps = [];
+      let tableName = model.getTableName();
+
+      if (_.isObject(tableName)) {
+        tableName = `${tableName.schema}.${tableName.tableName}`;
+      }
+
+      models[tableName] = model;
+
+      for (const attrName in model.rawAttributes) {
+        if (Object.prototype.hasOwnProperty.call(model.rawAttributes, attrName)) {
+          const attribute = model.rawAttributes[attrName];
+
+          if (attribute.references) {
+            dep = attribute.references.model;
+
+            if (_.isObject(dep)) {
+              dep = `${dep.schema}.${dep.tableName}`;
+            }
+
+            deps.push(dep);
+          }
+        }
+      }
+
+      deps = deps.filter(dep => tableName !== dep);
+
+      sorter.add(tableName, deps);
+    }
+
+    sorted = sorter.sort();
+    if (options.reverse) {
+      sorted = sorted.reverse();
+    }
+    for (const name of sorted) {
+      iterator(models[name], name);
+    }
+  }
+}
+
+module.exports = ModelManager;
+module.exports.ModelManager = ModelManager;
+module.exports.default = ModelManager;