Added common fields to the IssueType

and allow passing of child_complexity to the
'resolver_complexity' metho

app/graphql/resolvers/base_resolver.rb

@@ -10,7 +10,7 @@ module Resolvers
       end
     end
 
-    def self.resolver_complexity(args)
+    def self.resolver_complexity(args, child_complexity:)
       complexity = 1
       complexity += 1 if args[:sort]
       complexity += 5 if args[:search]

app/graphql/resolvers/concerns/resolves_pipelines.rb

@@ -20,7 +20,7 @@ module ResolvesPipelines
   end
 
   class_methods do
-    def resolver_complexity(args)
+    def resolver_complexity(args, child_complexity:)
       complexity = super
       complexity += 2 if args[:sha]
       complexity += 2 if args[:ref]

app/graphql/resolvers/issues_resolver.rb

@@ -58,7 +58,7 @@ module Resolvers
       IssuesFinder.new(context[:current_user], args).execute
     end
 
-    def self.resolver_complexity(args)
+    def self.resolver_complexity(args, child_complexity:)
       complexity = super
       complexity += 2 if args[:labelName]
 

app/graphql/types/base_field.rb

@@ -33,7 +33,7 @@ module Types
         limit_value = [args[:first], args[:last], page_size].compact.min
 
         # Resolvers may add extra complexity depending on used arguments
-        complexity = child_complexity + self.resolver&.try(:resolver_complexity, args).to_i
+        complexity = child_complexity + self.resolver&.try(:resolver_complexity, args, child_complexity: child_complexity).to_i
 
         # Resolvers may add extra complexity depending on number of items being loaded.
         multiplier = self.resolver&.try(:complexity_multiplier, args).to_f

app/graphql/types/issue_type.rb

@@ -15,6 +15,10 @@ module Types
     field :description, GraphQL::STRING_TYPE, null: true
     field :state, IssueStateEnum, null: false
 
+    field :reference, GraphQL::STRING_TYPE, null: false, method: :to_reference do
+      argument :full, GraphQL::BOOLEAN_TYPE, required: false, default_value: false
+    end
+
     field :author, Types::UserType,
           null: false,
           resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(User, obj.author_id).find }
@@ -37,7 +41,9 @@ module Types
     field :upvotes, GraphQL::INT_TYPE, null: false
     field :downvotes, GraphQL::INT_TYPE, null: false
     field :user_notes_count, GraphQL::INT_TYPE, null: false
+    field :web_path, GraphQL::STRING_TYPE, null: false, method: :issue_path
     field :web_url, GraphQL::STRING_TYPE, null: false
+    field :relative_position, GraphQL::INT_TYPE, null: true
 
     field :closed_at, Types::TimeType, null: true
 

app/presenters/issue_presenter.rb

@@ -4,6 +4,16 @@ class IssuePresenter < Gitlab::View::Presenter::Delegated
   presents :issue
 
   def web_url
-    Gitlab::UrlBuilder.build(issue)
+    url_builder.url
+  end
+
+  def issue_path
+    url_builder.issue_path(issue)
+  end
+
+  private
+
+  def url_builder
+    @url_builder ||= Gitlab::UrlBuilder.new(issue)
   end
 end

changelogs/unreleased/10795-add-epic-tree-BE-CE-epic-graphql-support.yml

@@ -0,0 +1,5 @@
+---
+title: Added reference, web_path, and relative_position fields to GraphQL Issue
+merge_request: 28998
+author:
+type: changed

spec/graphql/types/base_field_spec.rb

@@ -6,7 +6,7 @@ describe Types::BaseField do
   context 'when considering complexity' do
     let(:resolver) do
       Class.new(described_class) do
-        def self.resolver_complexity(args)
+        def self.resolver_complexity(args, child_complexity:)
           2 if args[:foo]
         end
 

spec/graphql/types/issue_type_spec.rb

@@ -6,4 +6,10 @@ describe GitlabSchema.types['Issue'] do
   it { expect(described_class.graphql_name).to eq('Issue') }
 
   it { expect(described_class).to require_graphql_authorizations(:read_issue) }
+
+  it 'has specific fields' do
+    %i[relative_position web_path web_url reference].each do |field_name|
+      expect(described_class).to have_graphql_field(field_name)
+    end
+  end
 end

spec/presenters/issue_presenter_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe IssuePresenter do
+  include Gitlab::Routing.url_helpers
+
+  let(:user)      { create(:user) }
+  let(:group)     { create(:group) }
+  let(:project)   { create(:project, group: group) }
+  let(:issue)     { create(:issue, project: project) }
+  let(:presenter) { described_class.new(issue, current_user: user) }
+
+  before do
+    group.add_developer(user)
+  end
+
+  describe '#web_url' do
+    it 'returns correct path' do
+      expect(presenter.web_url).to eq "http://localhost/#{group.name}/#{project.name}/issues/#{issue.iid}"
+    end
+  end
+
+  describe '#issue_path' do
+    it 'returns correct path' do
+      expect(presenter.issue_path).to eq "/#{group.name}/#{project.name}/issues/#{issue.iid}"
+    end
+  end
+end