gh-36 Add support for offset param

graphql/getter.js

@@ -91,6 +91,11 @@ export default class Getter {
     return this;
   };
 
+  withOffset = (offset) => {
+    this.offset = offset;
+    return this;
+  };
+
   validateIsSet = (prop, name, setter) => {
     if (prop == undefined || prop == null || prop.length == 0) {
       this.errors = [
@@ -127,6 +132,7 @@ export default class Getter {
       this.askString ||
       this.nearImageString ||
       this.limit ||
+      this.offset ||
       this.groupString
     ) {
       let args = [];
@@ -163,6 +169,10 @@ export default class Getter {
         args = [...args, `limit:${this.limit}`];
       }
 
+      if (this.offset) {
+        args = [...args, `offset:${this.offset}`];
+      }
+
       params = `(${args.join(",")})`;
     }
 

graphql/getter.test.js

@@ -29,6 +29,23 @@ test("a simple query with a limit", () => {
   expect(mockClient.query).toHaveBeenCalledWith(expectedQuery);
 });
 
+test("a simple query with a limit and offset", () => {
+  const mockClient = {
+    query: jest.fn(),
+  };
+
+  const expectedQuery = `{Get{Person(limit:7,offset:2){name}}}`;
+
+  new Getter(mockClient)
+    .withClassName("Person")
+    .withFields("name")
+    .withOffset(2)
+    .withLimit(7)
+    .do();
+
+  expect(mockClient.query).toHaveBeenCalledWith(expectedQuery);
+});
+
 test("a simple query with a group", () => {
   const mockClient = {
     query: jest.fn(),