Create util to handle pagination transformation

app/assets/javascripts/environments/stores/environments_store.js.es6

@@ -58,14 +58,7 @@ class EnvironmentsStore {
 
   setPagination(pagination = {}) {
     const normalizedHeaders = gl.utils.normalizeHeaders(pagination);
-    const paginationInformation = {
-      perPage: parseInt(normalizedHeaders['X-PER-PAGE'], 10),
-      page: parseInt(normalizedHeaders['X-PAGE'], 10),
-      total: parseInt(normalizedHeaders['X-TOTAL'], 10),
-      totalPages: parseInt(normalizedHeaders['X-TOTAL-PAGES'], 10),
-      nextPage: parseInt(normalizedHeaders['X-NEXT-PAGE'], 10),
-      previousPage: parseInt(normalizedHeaders['X-PREV-PAGE'], 10),
-    };
+    const paginationInformation = gl.utils.parseIntPagination(normalizedHeaders);
 
     this.state.paginationInformation = paginationInformation;
     return paginationInformation;

app/assets/javascripts/lib/utils/common_utils.js.es6

@@ -231,6 +231,21 @@
       return upperCaseHeaders;
     };
 
+    /**
+     * Parses pagination object string values into numbers.
+     *
+     * @param {Object} paginationInformation
+     * @returns {Object}
+     */
+    w.gl.utils.parseIntPagination = paginationInformation => ({
+      perPage: parseInt(paginationInformation['X-PER-PAGE'], 10),
+      page: parseInt(paginationInformation['X-PAGE'], 10),
+      total: parseInt(paginationInformation['X-TOTAL'], 10),
+      totalPages: parseInt(paginationInformation['X-TOTAL-PAGES'], 10),
+      nextPage: parseInt(paginationInformation['X-NEXT-PAGE'], 10),
+      previousPage: parseInt(paginationInformation['X-PREV-PAGE'], 10),
+    });
+
     /**
      * Transforms a DOMStringMap into a plain object.
      *

app/assets/javascripts/vue_pipelines_index/store.js.es6

@@ -5,16 +5,7 @@ require('../vue_realtime_listener');
 ((gl) => {
   const pageValues = (headers) => {
     const normalized = gl.utils.normalizeHeaders(headers);
-
-    const paginationInfo = {
-      perPage: +normalized['X-PER-PAGE'],
-      page: +normalized['X-PAGE'],
-      total: +normalized['X-TOTAL'],
-      totalPages: +normalized['X-TOTAL-PAGES'],
-      nextPage: +normalized['X-NEXT-PAGE'],
-      previousPage: +normalized['X-PREV-PAGE'],
-    };
-
+    const paginationInfo = gl.utils.normalizeHeaders(normalized);
     return paginationInfo;
   };
 

spec/javascripts/lib/utils/common_utils_spec.js.es6

@@ -108,6 +108,30 @@ require('~/lib/utils/common_utils');
       });
     });
 
+    describe('gl.utils.parseIntPagination', () => {
+      it('should parse to integers all string values and return pagination object', () => {
+        const pagination = {
+          'X-PER-PAGE': 10,
+          'X-PAGE': 2,
+          'X-TOTAL': 30,
+          'X-TOTAL-PAGES': 3,
+          'X-NEXT-PAGE': 3,
+          'X-PREV-PAGE': 1,
+        };
+
+        const expectedPagination = {
+          perPage: 10,
+          page: 2,
+          total: 30,
+          totalPages: 3,
+          nextPage: 3,
+          previousPage: 1,
+        };
+
+        expect(gl.utils.parseIntPagination(pagination)).toEqual(expectedPagination);
+      });
+    });
+
     describe('gl.utils.isMetaClick', () => {
       it('should identify meta click on Windows/Linux', () => {
         const e = {