[feat] Add paginated children (#291)

- Add `all_children` and `get_next_page_of_children` functions
- Add unit tests, cassettes

Author: nwithan8

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## Next Release
+
+- Add `all_children` and `get_next_page_of_children` in `user` service
+
 ## v6.0.0 (2023-12-06)
 
 - Removes `with_carbon_offset` parameter from `create`, `buy` and `regenerate_rates` methods in the shipment service since now EasyPost offers carbon neutral shipments by default for free

lib/easypost/services/base.rb

@@ -10,8 +10,11 @@ def initialize(client)
 
   protected
 
-  def get_all_helper(endpoint, cls, params, filters = nil)
-    response = @client.make_request(:get, endpoint, params)
+  def get_all_helper(endpoint, cls, params, filters = nil, beta = false)
+    response = @client.make_request(
+      :get, endpoint, params,
+      beta ? 'beta' : EasyPost::InternalUtilities::Constants::API_VERSION,
+    )
 
     response[EasyPost::InternalUtilities::Constants::FILTERS_KEY] = filters unless filters.nil?
 

lib/easypost/services/user.rb

@@ -78,4 +78,21 @@ def update_brand(id, params = {})
 
     EasyPost::InternalUtilities::Json.convert_json_to_object(response, EasyPost::Models::Brand)
   end
+
+  # Retrieve all child Users.
+  def all_children(params = {})
+    filters = { key: 'children' }
+
+    get_all_helper('users/children', EasyPost::Models::User, params, filters)
+  end
+
+  # Get the next page of child users.
+  def get_next_page_of_children(collection, page_size = nil)
+    raise EasyPost::Errors::EndOfPaginationError.new unless more_pages?(collection)
+
+    params = { before_id: collection.children.last.id }
+    params[:page_size] = page_size unless page_size.nil?
+
+    all_children(params)
+  end
 end

spec/cassettes/user/EasyPost_Services_User_all_retrieves_all_child_users.yml

@@ -79,4 +79,44 @@
       expect(brand.color).to eq(color)
     end
   end
+
+  describe '.all' do
+    it 'retrieves all child users' do
+      children = client.user.all_children(
+        page_size: Fixture.page_size,
+      )
+      expect(children[EasyPost::InternalUtilities::Constants::FILTERS_KEY]).to be_a(Hash)
+
+      child_user_array = children.children
+      expect(child_user_array.count).to be <= Fixture.page_size
+      expect(children.has_more).not_to be_nil
+      expect(child_user_array).to all(be_an_instance_of(EasyPost::Models::User))
+    end
+  end
+
+  describe '.get_next_page' do
+    it 'retrieves the next page of a collection' do
+      first_page = client.user.all_children(
+        page_size: Fixture.page_size,
+      )
+
+      begin
+        next_page = client.user.get_next_page_of_children(first_page)
+
+        first_page_first_id = first_page.children.first.id
+        next_page_first_id = next_page.children.first.id
+
+        # Did we actually get a new page?
+        expect(first_page_first_id).not_to eq(next_page_first_id)
+
+        # Verify that filters are being passed along for internal reference
+        expect(first_page[EasyPost::InternalUtilities::Constants::FILTERS_KEY]).to eq(
+          next_page[EasyPost::InternalUtilities::Constants::FILTERS_KEY],
+        )
+      rescue EasyPost::Errors::EndOfPaginationError => e
+        # If we get an error, make sure it's because there are no more pages.
+        expect(e.message).to eq(EasyPost::Constants::NO_MORE_PAGES)
+      end
+    end
+  end
 end