Provide EE backports for filtering by approver feature

Adds custom validator for ArrayNoneAny param
Extracts some logic in js into separate files

app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js

+export default IssuableTokenKeys => {
+  const wipToken = {
+    key: 'wip',
+    type: 'string',
+    param: '',
+    symbol: '',
+    icon: 'admin',
+    tag: 'Yes or No',
+    lowercaseValueOnSubmit: true,
+    uppercaseTokenName: true,
+    capitalizeTokenValue: true,
+  };
+
+  IssuableTokenKeys.tokenKeys.push(wipToken);
+  IssuableTokenKeys.tokenKeysWithAlternative.push(wipToken);
+};

app/assets/javascripts/filtered_search/available_dropdown_mappings.js

+import DropdownHint from './dropdown_hint';
+import DropdownUser from './dropdown_user';
+import DropdownNonUser from './dropdown_non_user';
+import DropdownEmoji from './dropdown_emoji';
+import NullDropdown from './null_dropdown';
+import DropdownAjaxFilter from './dropdown_ajax_filter';
+import DropdownUtils from './dropdown_utils';
+
+export default class AvailableDropdownMappings {
+  constructor(container, baseEndpoint, groupsOnly, includeAncestorGroups, includeDescendantGroups) {
+    this.container = container;
+    this.baseEndpoint = baseEndpoint;
+    this.groupsOnly = groupsOnly;
+    this.includeAncestorGroups = includeAncestorGroups;
+    this.includeDescendantGroups = includeDescendantGroups;
+  }
+
+  getAllowedMappings(supportedTokens) {
+    return this.buildMappings(supportedTokens, this.getMappings());
+  }
+
+  buildMappings(supportedTokens, availableMappings) {
+    const allowedMappings = {
+      hint: {
+        reference: null,
+        gl: DropdownHint,
+        element: this.container.querySelector('#js-dropdown-hint'),
+      },
+    };
+
+    supportedTokens.forEach(type => {
+      if (availableMappings[type]) {
+        allowedMappings[type] = availableMappings[type];
+      }
+    });
+
+    return allowedMappings;
+  }
+
+  getMappings() {
+    return {
+      author: {
+        reference: null,
+        gl: DropdownUser,
+        element: this.container.querySelector('#js-dropdown-author'),
+      },
+      assignee: {
+        reference: null,
+        gl: DropdownUser,
+        element: this.container.querySelector('#js-dropdown-assignee'),
+      },
+      milestone: {
+        reference: null,
+        gl: DropdownNonUser,
+        extraArguments: {
+          endpoint: this.getMilestoneEndpoint(),
+          symbol: '%',
+        },
+        element: this.container.querySelector('#js-dropdown-milestone'),
+      },
+      label: {
+        reference: null,
+        gl: DropdownNonUser,
+        extraArguments: {
+          endpoint: this.getLabelsEndpoint(),
+          symbol: '~',
+          preprocessing: DropdownUtils.duplicateLabelPreprocessing,
+        },
+        element: this.container.querySelector('#js-dropdown-label'),
+      },
+      'my-reaction': {
+        reference: null,
+        gl: DropdownEmoji,
+        element: this.container.querySelector('#js-dropdown-my-reaction'),
+      },
+      wip: {
+        reference: null,
+        gl: DropdownNonUser,
+        element: this.container.querySelector('#js-dropdown-wip'),
+      },
+      confidential: {
+        reference: null,
+        gl: DropdownNonUser,
+        element: this.container.querySelector('#js-dropdown-confidential'),
+      },
+      status: {
+        reference: null,
+        gl: NullDropdown,
+        element: this.container.querySelector('#js-dropdown-admin-runner-status'),
+      },
+      type: {
+        reference: null,
+        gl: NullDropdown,
+        element: this.container.querySelector('#js-dropdown-admin-runner-type'),
+      },
+      tag: {
+        reference: null,
+        gl: DropdownAjaxFilter,
+        extraArguments: {
+          endpoint: this.getRunnerTagsEndpoint(),
+          symbol: '~',
+        },
+        element: this.container.querySelector('#js-dropdown-runner-tag'),
+      },
+    };
+  }
+
+  getMilestoneEndpoint() {
+    return `${this.baseEndpoint}/milestones.json`;
+  }
+
+  getLabelsEndpoint() {
+    let endpoint = `${this.baseEndpoint}/labels.json?`;
+
+    if (this.groupsOnly) {
+      endpoint = `${endpoint}only_group_labels=true&`;
+    }
+
+    if (this.includeAncestorGroups) {
+      endpoint = `${endpoint}include_ancestor_groups=true&`;
+    }
+
+    if (this.includeDescendantGroups) {
+      endpoint = `${endpoint}include_descendant_groups=true`;
+    }
+
+    return endpoint;
+  }
+
+  getRunnerTagsEndpoint() {
+    return `${this.baseEndpoint}/admin/runners/tag_list.json`;
+  }
+}

app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js

+import AvailableDropdownMappings from 'ee_else_ce/filtered_search/available_dropdown_mappings';
 import _ from 'underscore';
 import DropLab from '~/droplab/drop_lab';
 import FilteredSearchContainer from './container';
 import FilteredSearchTokenKeys from './filtered_search_token_keys';
 import DropdownUtils from './dropdown_utils';
-import DropdownHint from './dropdown_hint';
-import DropdownEmoji from './dropdown_emoji';
-import DropdownNonUser from './dropdown_non_user';
-import DropdownUser from './dropdown_user';
-import DropdownAjaxFilter from './dropdown_ajax_filter';
-import NullDropdown from './null_dropdown';
 import FilteredSearchVisualTokens from './filtered_search_visual_tokens';
 
 export default class FilteredSearchDropdownManager {
@@ -50,114 +45,15 @@ export default class FilteredSearchDropdownManager {
 
   setupMapping() {
     const supportedTokens = this.filteredSearchTokenKeys.getKeys();
-    const allowedMappings = {
-      hint: {
-        reference: null,
-        gl: DropdownHint,
-        element: this.container.querySelector('#js-dropdown-hint'),
-      },
-    };
-    const availableMappings = {
-      author: {
-        reference: null,
-        gl: DropdownUser,
-        element: this.container.querySelector('#js-dropdown-author'),
-      },
-      assignee: {
-        reference: null,
-        gl: DropdownUser,
-        element: this.container.querySelector('#js-dropdown-assignee'),
-      },
-      milestone: {
-        reference: null,
-        gl: DropdownNonUser,
-        extraArguments: {
-          endpoint: this.getMilestoneEndpoint(),
-          symbol: '%',
-        },
-        element: this.container.querySelector('#js-dropdown-milestone'),
-      },
-      label: {
-        reference: null,
-        gl: DropdownNonUser,
-        extraArguments: {
-          endpoint: this.getLabelsEndpoint(),
-          symbol: '~',
-          preprocessing: DropdownUtils.duplicateLabelPreprocessing,
-        },
-        element: this.container.querySelector('#js-dropdown-label'),
-      },
-      'my-reaction': {
-        reference: null,
-        gl: DropdownEmoji,
-        element: this.container.querySelector('#js-dropdown-my-reaction'),
-      },
-      wip: {
-        reference: null,
-        gl: DropdownNonUser,
-        element: this.container.querySelector('#js-dropdown-wip'),
-      },
-      confidential: {
-        reference: null,
-        gl: DropdownNonUser,
-        element: this.container.querySelector('#js-dropdown-confidential'),
-      },
-      status: {
-        reference: null,
-        gl: NullDropdown,
-        element: this.container.querySelector('#js-dropdown-admin-runner-status'),
-      },
-      type: {
-        reference: null,
-        gl: NullDropdown,
-        element: this.container.querySelector('#js-dropdown-admin-runner-type'),
-      },
-      tag: {
-        reference: null,
-        gl: DropdownAjaxFilter,
-        extraArguments: {
-          endpoint: this.getRunnerTagsEndpoint(),
-          symbol: '~',
-        },
-        element: this.container.querySelector('#js-dropdown-runner-tag'),
-      },
-    };
-
-    supportedTokens.forEach(type => {
-      if (availableMappings[type]) {
-        allowedMappings[type] = availableMappings[type];
-      }
-    });
-
-    this.mapping = allowedMappings;
-  }
-
-  getMilestoneEndpoint() {
-    const endpoint = `${this.baseEndpoint}/milestones.json`;
-
-    return endpoint;
-  }
-
-  getLabelsEndpoint() {
-    let endpoint = `${this.baseEndpoint}/labels.json?`;
-
-    if (this.groupsOnly) {
-      endpoint = `${endpoint}only_group_labels=true&`;
-    }
-
-    if (this.includeAncestorGroups) {
-      endpoint = `${endpoint}include_ancestor_groups=true&`;
-    }
-
-    if (this.includeDescendantGroups) {
-      endpoint = `${endpoint}include_descendant_groups=true`;
-    }
-
-    return endpoint;
-  }
+    const availableMappings = new AvailableDropdownMappings(
+      this.container,
+      this.baseEndpoint,
+      this.groupsOnly,
+      this.includeAncestorGroups,
+      this.includeDescendantGroups,
+    );
 
-  getRunnerTagsEndpoint() {
-    return `${this.baseEndpoint}/admin/runners/tag_list.json`;
+    this.mapping = availableMappings.getAllowedMappings(supportedTokens);
   }
 
   static addWordToInput(tokenName, tokenValue = '', clicked = false, options = {}) {

app/assets/javascripts/filtered_search/filtered_search_token_keys.js

@@ -88,21 +88,4 @@ export default class FilteredSearchTokenKeys {
     this.tokenKeys.push(confidentialToken);
     this.tokenKeysWithAlternative.push(confidentialToken);
   }
-
-  addExtraTokensForMergeRequests() {
-    const wipToken = {
-      key: 'wip',
-      type: 'string',
-      param: '',
-      symbol: '',
-      icon: 'admin',
-      tag: 'Yes or No',
-      lowercaseValueOnSubmit: true,
-      uppercaseTokenName: true,
-      capitalizeTokenValue: true,
-    };
-
-    this.tokenKeys.push(wipToken);
-    this.tokenKeysWithAlternative.push(wipToken);
-  }
 }

app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js

-import _ from 'underscore';
-import AjaxCache from '~/lib/utils/ajax_cache';
+import VisualTokenValue from 'ee_else_ce/filtered_search/visual_token_value';
 import { objectToQueryString } from '~/lib/utils/common_utils';
-import Flash from '../flash';
 import FilteredSearchContainer from './container';
-import UsersCache from '../lib/utils/users_cache';
-import DropdownUtils from './dropdown_utils';
 
 export default class FilteredSearchVisualTokens {
   static getLastVisualTokenBeforeInput() {
@@ -20,21 +16,6 @@ export default class FilteredSearchVisualTokens {
     };
   }
 
-  /**
-   * Returns a computed API endpoint
-   * and query string composed of values from endpointQueryParams
-   * @param {String} endpoint
-   * @param {String} endpointQueryParams
-   */
-  static getEndpointWithQueryParams(endpoint, endpointQueryParams) {
-    if (!endpointQueryParams) {
-      return endpoint;
-    }
-
-    const queryString = objectToQueryString(JSON.parse(endpointQueryParams));
-    return `${endpoint}?${queryString}`;
-  }
-
   static unselectTokens() {
     const otherTokens = FilteredSearchContainer.container.querySelectorAll(
       '.js-visual-token .selectable.selected',
@@ -76,114 +57,15 @@ export default class FilteredSearchVisualTokens {
     `;
   }
 
-  static setTokenStyle(tokenContainer, backgroundColor, textColor) {
-    const token = tokenContainer;
-
-    token.style.backgroundColor = backgroundColor;
-    token.style.color = textColor;
-
-    if (textColor === '#FFFFFF') {
-      const removeToken = token.querySelector('.remove-token');
-      removeToken.classList.add('inverted');
-    }
-
-    return token;
-  }
-
-  static updateLabelTokenColor(tokenValueContainer, tokenValue) {
-    const filteredSearchInput = FilteredSearchContainer.container.querySelector('.filtered-search');
-    const { baseEndpoint } = filteredSearchInput.dataset;
-    const labelsEndpoint = FilteredSearchVisualTokens.getEndpointWithQueryParams(
-      `${baseEndpoint}/labels.json`,
-      filteredSearchInput.dataset.endpointQueryParams,
-    );
-
-    return AjaxCache.retrieve(labelsEndpoint)
-      .then(labels => {
-        const matchingLabel = (labels || []).find(
-          label => `~${DropdownUtils.getEscapedText(label.title)}` === tokenValue,
-        );
-
-        if (!matchingLabel) {
-          return;
-        }
-
-        FilteredSearchVisualTokens.setTokenStyle(
-          tokenValueContainer,
-          matchingLabel.color,
-          matchingLabel.text_color,
-        );
-      })
-      .catch(() => new Flash('An error occurred while fetching label colors.'));
-  }
-
-  static updateUserTokenAppearance(tokenValueContainer, tokenValueElement, tokenValue) {
-    const username = tokenValue.replace(/^@/, '');
-    return (
-      UsersCache.retrieve(username)
-        .then(user => {
-          if (!user) {
-            return;
-          }
-
-          /* eslint-disable no-param-reassign */
-          tokenValueContainer.dataset.originalValue = tokenValue;
-          tokenValueElement.innerHTML = `
-          <img class="avatar s20" src="${user.avatar_url}" alt="">
-          ${_.escape(user.name)}
-        `;
-          /* eslint-enable no-param-reassign */
-        })
-        // ignore error and leave username in the search bar
-        .catch(() => {})
-    );
-  }
-
-  static updateEmojiTokenAppearance(tokenValueContainer, tokenValueElement, tokenValue) {
-    const container = tokenValueContainer;
-    const element = tokenValueElement;
-
-    return (
-      import(/* webpackChunkName: 'emoji' */ '../emoji')
-        .then(Emoji => {
-          if (!Emoji.isEmojiNameValid(tokenValue)) {
-            return;
-          }
-
-          container.dataset.originalValue = tokenValue;
-          element.innerHTML = Emoji.glEmojiTag(tokenValue);
-        })
-        // ignore error and leave emoji name in the search bar
-        .catch(() => {})
-    );
-  }
-
   static renderVisualTokenValue(parentElement, tokenName, tokenValue) {
+    const tokenType = tokenName.toLowerCase();
     const tokenValueContainer = parentElement.querySelector('.value-container');
     const tokenValueElement = tokenValueContainer.querySelector('.value');
     tokenValueElement.innerText = tokenValue;
 
-    if (['none', 'any'].includes(tokenValue.toLowerCase())) {
-      return;
-    }
+    const visualTokenValue = new VisualTokenValue(tokenValue, tokenType);
 
-    const tokenType = tokenName.toLowerCase();
-
-    if (tokenType === 'label') {
-      FilteredSearchVisualTokens.updateLabelTokenColor(tokenValueContainer, tokenValue);
-    } else if (tokenType === 'author' || tokenType === 'assignee') {
-      FilteredSearchVisualTokens.updateUserTokenAppearance(
-        tokenValueContainer,
-        tokenValueElement,
-        tokenValue,
-      );
-    } else if (tokenType === 'my-reaction') {
-      FilteredSearchVisualTokens.updateEmojiTokenAppearance(
-        tokenValueContainer,
-        tokenValueElement,
-        tokenValue,
-      );
-    }
+    visualTokenValue.render(tokenValueContainer, tokenValueElement);
   }
 
   static addVisualTokenElement(name, value, options = {}) {
@@ -318,6 +200,21 @@ export default class FilteredSearchVisualTokens {
     }
   }
 
+  /**
+   * Returns a computed API endpoint
+   * and query string composed of values from endpointQueryParams
+   * @param {String} endpoint
+   * @param {String} endpointQueryParams
+   */
+  static getEndpointWithQueryParams(endpoint, endpointQueryParams) {
+    if (!endpointQueryParams) {
+      return endpoint;
+    }
+
+    const queryString = objectToQueryString(JSON.parse(endpointQueryParams));
+    return `${endpoint}?${queryString}`;
+  }
+
   static editToken(token) {
     const input = FilteredSearchContainer.container.querySelector('.filtered-search');
 

app/assets/javascripts/filtered_search/visual_token_value.js

+import _ from 'underscore';
+import FilteredSearchContainer from '~/filtered_search/container';
+import FilteredSearchVisualTokens from '~/filtered_search/filtered_search_visual_tokens';
+import AjaxCache from '~/lib/utils/ajax_cache';
+import DropdownUtils from '~/filtered_search/dropdown_utils';
+import Flash from '~/flash';
+import UsersCache from '~/lib/utils/users_cache';
+
+export default class VisualTokenValue {
+  constructor(tokenValue, tokenType) {
+    this.tokenValue = tokenValue;
+    this.tokenType = tokenType;
+  }
+
+  render(tokenValueContainer, tokenValueElement) {
+    const { tokenType } = this;
+
+    if (['none', 'any'].includes(tokenType)) {
+      return;
+    }
+
+    if (tokenType === 'label') {
+      this.updateLabelTokenColor(tokenValueContainer);
+    } else if (tokenType === 'author' || tokenType === 'assignee') {
+      this.updateUserTokenAppearance(tokenValueContainer, tokenValueElement);
+    } else if (tokenType === 'my-reaction') {
+      this.updateEmojiTokenAppearance(tokenValueContainer, tokenValueElement);
+    }
+  }
+
+  updateUserTokenAppearance(tokenValueContainer, tokenValueElement) {
+    const { tokenValue } = this;
+    const username = this.tokenValue.replace(/^@/, '');
+
+    return (
+      UsersCache.retrieve(username)
+        .then(user => {
+          if (!user) {
+            return;
+          }
+
+          /* eslint-disable no-param-reassign */
+          tokenValueContainer.dataset.originalValue = tokenValue;
+          tokenValueElement.innerHTML = `
+          <img class="avatar s20" src="${user.avatar_url}" alt="">
+          ${_.escape(user.name)}
+        `;
+          /* eslint-enable no-param-reassign */
+        })
+        // ignore error and leave username in the search bar
+        .catch(() => {})
+    );
+  }
+
+  updateLabelTokenColor(tokenValueContainer) {
+    const { tokenValue } = this;
+    const filteredSearchInput = FilteredSearchContainer.container.querySelector('.filtered-search');
+    const { baseEndpoint } = filteredSearchInput.dataset;
+    const labelsEndpoint = FilteredSearchVisualTokens.getEndpointWithQueryParams(
+      `${baseEndpoint}/labels.json`,
+      filteredSearchInput.dataset.endpointQueryParams,
+    );
+
+    return AjaxCache.retrieve(labelsEndpoint)
+      .then(labels => {
+        const matchingLabel = (labels || []).find(
+          label => `~${DropdownUtils.getEscapedText(label.title)}` === tokenValue,
+        );
+
+        if (!matchingLabel) {
+          return;
+        }
+
+        VisualTokenValue.setTokenStyle(
+          tokenValueContainer,
+          matchingLabel.color,
+          matchingLabel.text_color,
+        );
+      })
+      .catch(() => new Flash('An error occurred while fetching label colors.'));
+  }
+
+  static setTokenStyle(tokenValueContainer, backgroundColor, textColor) {
+    const token = tokenValueContainer;
+
+    token.style.backgroundColor = backgroundColor;
+    token.style.color = textColor;
+
+    if (textColor === '#FFFFFF') {
+      const removeToken = token.querySelector('.remove-token');
+      removeToken.classList.add('inverted');
+    }
+
+    return token;
+  }
+
+  updateEmojiTokenAppearance(tokenValueContainer, tokenValueElement) {
+    const container = tokenValueContainer;
+    const element = tokenValueElement;
+    const value = this.tokenValue;
+
+    return (
+      import(/* webpackChunkName: 'emoji' */ '../emoji')
+        .then(Emoji => {
+          if (!Emoji.isEmojiNameValid(value)) {
+            return;
+          }
+
+          container.dataset.originalValue = value;
+          element.innerHTML = Emoji.glEmojiTag(value);
+        })
+        // ignore error and leave emoji name in the search bar
+        .catch(() => {})
+    );
+  }
+}

app/assets/javascripts/pages/dashboard/merge_requests/index.js

 import projectSelect from '~/project_select';
 import initFilteredSearch from '~/pages/search/init_filtered_search';
+import addExtraTokensForMergeRequests from 'ee_else_ce/filtered_search/add_extra_tokens_for_merge_requests';
 import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered_search_token_keys';
 import { FILTERED_SEARCH } from '~/pages/constants';
 
 document.addEventListener('DOMContentLoaded', () => {
-  IssuableFilteredSearchTokenKeys.addExtraTokensForMergeRequests();
+  addExtraTokensForMergeRequests(IssuableFilteredSearchTokenKeys);
 
   initFilteredSearch({
     page: FILTERED_SEARCH.MERGE_REQUESTS,

app/assets/javascripts/pages/groups/merge_requests/index.js

 import projectSelect from '~/project_select';
 import initFilteredSearch from '~/pages/search/init_filtered_search';
 import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered_search_token_keys';
+import addExtraTokensForMergeRequests from 'ee_else_ce/filtered_search/add_extra_tokens_for_merge_requests';
 import { FILTERED_SEARCH } from '~/pages/constants';
 
 document.addEventListener('DOMContentLoaded', () => {
-  IssuableFilteredSearchTokenKeys.addExtraTokensForMergeRequests();
+  addExtraTokensForMergeRequests(IssuableFilteredSearchTokenKeys);
 
   initFilteredSearch({
     page: FILTERED_SEARCH.MERGE_REQUESTS,

app/assets/javascripts/pages/projects/merge_requests/index/index.js

@@ -2,12 +2,13 @@ import IssuableIndex from '~/issuable_index';
 import ShortcutsNavigation from '~/behaviors/shortcuts/shortcuts_navigation';
 import UsersSelect from '~/users_select';
 import initFilteredSearch from '~/pages/search/init_filtered_search';
+import addExtraTokensForMergeRequests from 'ee_else_ce/filtered_search/add_extra_tokens_for_merge_requests';
 import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered_search_token_keys';
 import { FILTERED_SEARCH } from '~/pages/constants';
 import { ISSUABLE_INDEX } from '~/pages/projects/constants';
 
 document.addEventListener('DOMContentLoaded', () => {
-  IssuableFilteredSearchTokenKeys.addExtraTokensForMergeRequests();
+  addExtraTokensForMergeRequests(IssuableFilteredSearchTokenKeys);
 
   initFilteredSearch({
     page: FILTERED_SEARCH.MERGE_REQUESTS,

app/views/projects/merge_requests/_merge_requests.html.haml

 %ul.content-list.mr-list.issuable-list
-  - if @merge_requests.exists?
+  - if @merge_requests.present?
     = render @merge_requests
   - else
     = render 'shared/empty_states/merge_requests'

app/views/shared/issuable/_search_bar.html.haml

@@ -71,6 +71,7 @@
                 = render 'shared/issuable/user_dropdown_item',
                   user: User.new(username: '{{username}}', name: '{{name}}'),
                   avatar: { lazy: true, url: '{{avatar_url}}' }
+            = render_if_exists 'shared/issuable/approver_dropdown'
             #js-dropdown-milestone.filtered-search-input-dropdown-menu.dropdown-menu
               %ul{ data: { dropdown: true } }
                 %li.filter-dropdown-item{ data: { value: 'None' } }

lib/api/helpers/custom_validators.rb

@@ -22,9 +22,22 @@ module API
                                                message: "should be an integer, 'None' or 'Any'"
         end
       end
+
+      class ArrayNoneAny < Grape::Validations::Base
+        def validate_param!(attr_name, params)
+          value = params[attr_name]
+
+          return if value.is_a?(Array) ||
+              [IssuableFinder::FILTER_NONE, IssuableFinder::FILTER_ANY].include?(value.to_s.downcase)
+
+          raise Grape::Exceptions::Validation, params: [@scope.full_name(attr_name)],
+                                               message: "should be an array, 'None' or 'Any'"
+        end
+      end
     end
   end
 end
 
 Grape::Validations.register_validator(:absence, ::API::Helpers::CustomValidators::Absence)
 Grape::Validations.register_validator(:integer_none_any, ::API::Helpers::CustomValidators::IntegerNoneAny)
+Grape::Validations.register_validator(:array_none_any, ::API::Helpers::CustomValidators::ArrayNoneAny)

lib/api/merge_requests.rb

@@ -12,6 +12,9 @@ module API
     helpers do
       params :optional_params_ee do
       end
+
+      params :optional_merge_requests_search_params do
+      end
     end
 
     def self.update_params_at_least_one_of
@@ -112,6 +115,8 @@ module API
         optional :search, type: String, desc: 'Search merge requests for text present in the title, description, or any combination of these'
         optional :in, type: String, desc: '`title`, `description`, or a string joining them with comma'
         optional :wip, type: String, values: %w[yes no], desc: 'Search merge requests for WIP in the title'
+
+        use :optional_merge_requests_search_params
         use :pagination
       end
     end

spec/lib/api/helpers/custom_validators_spec.rb

@@ -50,6 +50,29 @@ describe API::Helpers::CustomValidators do
     end
   end
 
+  describe API::Helpers::CustomValidators::ArrayNoneAny do
+    subject do
+      described_class.new(['test'], {}, false, scope.new)
+    end
+
+    context 'valid parameters' do
+      it 'does not raise a validation error' do
+        expect_no_validation_error({ 'test' => [] })
+        expect_no_validation_error({ 'test' => [1, 2, 3] })
+        expect_no_validation_error({ 'test' => 'None' })
+        expect_no_validation_error({ 'test' => 'Any' })
+        expect_no_validation_error({ 'test' => 'none' })
+        expect_no_validation_error({ 'test' => 'any' })
+      end
+    end
+
+    context 'invalid parameters' do
+      it 'should raise a validation error' do
+        expect_validation_error({ 'test' => 'some_other_string' })
+      end
+    end
+  end
+
   def expect_no_validation_error(params)
     expect { validate_test_param!(params) }.not_to raise_error
   end