Add ability to query projects in GraphQL API

This change adds ability to search projects by search criteria and user
membership to Projects GraphQL API.

app/graphql/resolvers/projects_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  class ProjectsResolver < BaseResolver
+    type Types::ProjectType, null: true
+
+    argument :membership, GraphQL::BOOLEAN_TYPE,
+             required: false,
+             description: 'Limit projects that the current user is a member of'
+
+    argument :search, GraphQL::STRING_TYPE,
+             required: false,
+             description: 'Search criteria'
+
+    def resolve(**args)
+      ProjectsFinder
+        .new(current_user: current_user, params: project_finder_params(args))
+        .execute
+    end
+
+    private
+
+    def project_finder_params(params)
+      {
+        without_deleted: true,
+        non_public: params[:membership],
+        search: params[:search]
+      }.compact
+    end
+  end
+end

app/graphql/types/query_type.rb

@@ -9,6 +9,11 @@ module Types
           resolver: Resolvers::ProjectResolver,
           description: "Find a project"
 
+    field :projects, Types::ProjectType.connection_type,
+          null: true,
+          resolver: Resolvers::ProjectsResolver,
+          description: "Find projects visible to the current user"
+
     field :group, Types::GroupType,
           null: true,
           resolver: Resolvers::GroupResolver,

changelogs/unreleased/214583-add-ability-to-query-projects.yml

+---
+title: Add ability to query Projects using GraphQL API
+merge_request: 30146
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -8088,6 +8088,41 @@ type Query {
     fullPath: ID!
   ): Project
 
+  """
+  Find projects visible to the current user
+  """
+  projects(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+
+    """
+    Limit projects that the current user is a member of
+    """
+    membership: Boolean
+
+    """
+    Search criteria
+    """
+    search: String
+  ): ProjectConnection
+
   """
   Find Snippets visible to the current user
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -23887,6 +23887,79 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "projects",
+              "description": "Find projects visible to the current user",
+              "args": [
+                {
+                  "name": "membership",
+                  "description": "Limit projects that the current user is a member of",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Boolean",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "search",
+                  "description": "Search criteria",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "after",
+                  "description": "Returns the elements in the list that come after the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "before",
+                  "description": "Returns the elements in the list that come before the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "first",
+                  "description": "Returns the first _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "last",
+                  "description": "Returns the last _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "ProjectConnection",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "snippets",
               "description": "Find Snippets visible to the current user",

spec/graphql/resolvers/projects_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::ProjectsResolver do
+  include GraphqlHelpers
+
+  describe '#resolve' do
+    subject { resolve(described_class, obj: nil, args: filters, ctx: { current_user: current_user }) }
+
+    let_it_be(:project) { create(:project, :public) }
+    let_it_be(:other_project) { create(:project, :public) }
+    let_it_be(:private_project) { create(:project, :private) }
+    let_it_be(:other_private_project) { create(:project, :private) }
+
+    let_it_be(:user) { create(:user) }
+
+    let(:filters) { {} }
+
+    before_all do
+      project.add_developer(user)
+      private_project.add_developer(user)
+    end
+
+    context 'when user is not logged in' do
+      let(:current_user) { nil }
+
+      context 'when no filters are applied' do
+        it 'returns all public projects' do
+          is_expected.to contain_exactly(project, other_project)
+        end
+
+        context 'when search filter is provided' do
+          let(:filters) { { search: project.name } }
+
+          it 'returns matching project' do
+            is_expected.to contain_exactly(project)
+          end
+        end
+
+        context 'when membership filter is provided' do
+          let(:filters) { { membership: true } }
+
+          it 'returns empty list' do
+            is_expected.to be_empty
+          end
+        end
+      end
+    end
+
+    context 'when user is logged in' do
+      let(:current_user) { user }
+
+      context 'when no filters are applied' do
+        it 'returns all visible projects for the user' do
+          is_expected.to contain_exactly(project, other_project, private_project)
+        end
+
+        context 'when search filter is provided' do
+          let(:filters) { { search: project.name } }
+
+          it 'returns matching project' do
+            is_expected.to contain_exactly(project)
+          end
+        end
+
+        context 'when membership filter is provided' do
+          let(:filters) { { membership: true } }
+
+          it 'returns projects that user is member of' do
+            is_expected.to contain_exactly(project, private_project)
+          end
+        end
+      end
+    end
+  end
+end