Added new eagerOptions service option

Author: Dekel Barzilay

README.md

@@ -143,6 +143,11 @@ Note that all this eager related options are optional.
   the service. Defaults to `'[]'`, meaning no eager queries allowed. See
   [`allowGraph`](https://vincit.github.io/objection.js/api/query-builder/eager-methods.html#allowgraph)
   documentation.
+  
+- **`eagerOptions`** - Options object to use with `$eager` and `$joinEager` query operators. 
+  See [`GraphOptions`](https://vincit.github.io/objection.js/api/types/#type-graphoptions)
+  documentation.
+
 - **`eagerFilters`** - option to impose compulsory eager filter. It takes an
   object or array of objects with the following properties:
   - `expression` - the relation expression that the filter will be applied.
@@ -214,7 +219,8 @@ Note that all this eager related options are optional.
   See [`allowGraph`](https://vincit.github.io/objection.js/api/query-builder/eager-methods.html#allowgraph)
   documentation.
 
-- **`eagerOptions`** - Options object to use with `$eager` and `$joinEager` query operators. 
+- **`eagerOptions`** - Options object to use with `$eager` and `$joinEager` query operators.
+  merges on top of the `eagerOptions` service option.
   See [`GraphOptions`](https://vincit.github.io/objection.js/api/types/#type-graphoptions)
   documentation.
 

src/index.js

@@ -92,6 +92,7 @@ class Service extends AdapterService {
     this.idSeparator = options.idSeparator || ',';
     this.jsonSchema = options.model.jsonSchema;
     this.allowedEager = options.allowedEager;
+    this.eagerOptions = options.eagerOptions;
     this.eagerFilters = options.eagerFilters;
     this.allowedInsert = options.allowedInsert && RelationExpression.create(options.allowedInsert);
     this.insertGraphOptions = options.insertGraphOptions;
@@ -259,7 +260,7 @@ class Service extends AdapterService {
   createQuery (params = {}) {
     const { filters, query } = this.filterQuery(params);
     const q = this._createQuery(params).skipUndefined();
-    const eagerOptions = params.eagerOptions || {};
+    const eagerOptions = { ...this.eagerOptions, ...params.eagerOptions };
 
     if (this.allowedEager) { q.allowGraph(this.allowedEager); }