Teams/Organizations part 3, in progress. Table: org_user, and indexes.

Thanks to xet7 !

Related #802

models/orgUser.js

@@ -0,0 +1,80 @@
+OrgUser = new Mongo.Collection('org_user');
+
+/**
+ * A Organization User in wekan
+ */
+OrgUser.attachSchema(
+  new SimpleSchema({
+    id: {
+      /**
+       * the organization user's id
+       */
+      type: Number,
+      optional: true,
+      // eslint-disable-next-line consistent-return
+      autoValue() {
+        if (this.isInsert && !this.isSet) {
+          return incrementCounter('counters', 'org_user_id', 1);
+        }
+      },
+    },
+    org_id: {
+      /**
+       * the organization id
+       */
+      type: Number,
+      optional: true,
+    },
+    user_id: {
+      /**
+       * the user id
+       */
+      type: Number,
+      optional: true,
+    },
+    role: {
+      /**
+       * the role of user
+       */
+      type: String,
+      optional: true,
+      max: 20,
+    },
+    createdAt: {
+      /**
+       * creation date of the organization user
+       */
+      type: Date,
+      // eslint-disable-next-line consistent-return
+      autoValue() {
+        if (this.isInsert) {
+          return new Date();
+        } else {
+          this.unset();
+        }
+      },
+    },
+    modifiedAt: {
+      type: Date,
+      denyUpdate: false,
+      // eslint-disable-next-line consistent-return
+      autoValue() {
+        if (this.isInsert || this.isUpsert || this.isUpdate) {
+          return new Date();
+        } else {
+          this.unset();
+        }
+      },
+    },
+  }),
+);
+
+if (Meteor.isServer) {
+  // Index for Organization User.
+  Meteor.startup(() => {
+    OrgUser._collection._ensureIndex({ org_id: -1 });
+    OrgUser._collection._ensureIndex({ org_id: -1, user_id: -1 });
+  });
+}
+
+export default OrgUser;