diff --git a/src/addon/mod/data/components/index/index.ts b/src/addon/mod/data/components/index/index.ts
index e1d85cda6..409bf230f 100644
--- a/src/addon/mod/data/components/index/index.ts
+++ b/src/addon/mod/data/components/index/index.ts
@@ -99,6 +99,10 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
         this.selectedGroup = this.group || 0;
 
         this.loadContent(false, true).then(() => {
+            if (!this.data) {
+                return;
+            }
+
             this.dataProvider.logView(this.data.id).then(() => {
                 this.courseProvider.checkModuleCompletion(this.courseId, this.module.completionstatus);
             });
@@ -216,10 +220,7 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
                 }
                 this.search.advanced = [];
 
-                this.fields = {};
-                fields.forEach((field) => {
-                    this.fields[field.id] = field;
-                });
+                this.fields = this.utils.arrayToObject(fields, 'id');
                 this.fieldsArray = this.utils.objectToArray(this.fields);
 
                 return this.fetchEntriesData();
@@ -295,11 +296,7 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
 
                 entries.entries.forEach((entry) => {
                     // Index contents by fieldid.
-                    const contents = {};
-                    entry.contents.forEach((field) => {
-                        contents[field.fieldid] = field;
-                    });
-                    entry.contents = contents;
+                    entry.contents = this.utils.arrayToObject(entry.contents, 'fieldid');
 
                     if (typeof this.offlineActions[entry.id] != 'undefined') {
                         promises.push(this.dataHelper.applyOfflineActions(entry, this.offlineActions[entry.id], this.fieldsArray));
@@ -391,7 +388,12 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
         this.searchEntries(0);
     }
 
-    // Set group to see the database.
+    /**
+     * Set group to see the database.
+     *
+     * @param  {number}       groupId Group ID.
+     * @return {Promise<any>}         Resolved when new group is selected or rejected if not.
+     */
     setGroup(groupId: number): Promise<any> {
         this.selectedGroup = groupId;
 
@@ -406,14 +408,13 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
      * Opens add entries form.
      */
     gotoAddEntries(): void {
-        const stateParams = {
-            moduleId: this.module.id,
+        const params = {
             module: this.module,
             courseId: this.courseId,
             group: this.selectedGroup
         };
 
-        this.navCtrl.push('AddonModDataEditPage', stateParams);
+        this.navCtrl.push('AddonModDataEditPage', params);
     }
 
     /**
@@ -422,15 +423,14 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
      * @param {number} entryId Entry ID.
      */
     gotoEntry(entryId: number): void {
-        const stateParams = {
+        const params = {
             module: this.module,
-            moduleId: this.module.id,
             courseId: this.courseId,
             entryId: entryId,
             group: this.selectedGroup
         };
 
-        this.navCtrl.push('AddonModDataEntryPage', stateParams);
+        this.navCtrl.push('AddonModDataEntryPage', params);
     }
 
     /**
diff --git a/src/addon/mod/data/fields/textarea/component/textarea.html b/src/addon/mod/data/fields/textarea/component/textarea.html
index d07c54193..861d1edc9 100644
--- a/src/addon/mod/data/fields/textarea/component/textarea.html
+++ b/src/addon/mod/data/fields/textarea/component/textarea.html
@@ -2,9 +2,8 @@
     <ion-input *ngIf="mode == 'search'" type="text" [placeholder]="field.name" [formControlName]="'f_'+field.id"></ion-input>
 
     <span *ngIf="mode == 'edit'" [core-mark-required]="field.required" class="core-mark-required"></span>
-    <core-rich-text-editor *ngIf="mode == 'edit'" item-content [control]="form.controls['f_'+field.id]" [placeholder]="field.name" [formControlName]="'f_'+field.id"></core-rich-text-editor>
-    <!-- @todo: [component]="component" [componentId]="componentId" -->
-     <core-input-errors *ngIf="error && mode == 'edit'" [control]="form.controls['f_'+field.id]" [errorText]="error"></core-input-errors>
+    <core-rich-text-editor *ngIf="mode == 'edit'" item-content [control]="form.controls['f_'+field.id]" [placeholder]="field.name" [formControlName]="'f_'+field.id" [component]="component" [componentId]="componentId"></core-rich-text-editor>
+    <core-input-errors *ngIf="error && mode == 'edit'" [control]="form.controls['f_'+field.id]" [errorText]="error"></core-input-errors>
 </span>
 
 <core-format-text *ngIf="isShowOrListMode() && value" [text]="format(value)" [component]="component" [componentId]="componentId"></core-format-text>
\ No newline at end of file
diff --git a/src/addon/mod/data/pages/edit/edit.ts b/src/addon/mod/data/pages/edit/edit.ts
index 2f6e44566..a4daffa6f 100644
--- a/src/addon/mod/data/pages/edit/edit.ts
+++ b/src/addon/mod/data/pages/edit/edit.ts
@@ -154,12 +154,7 @@ export class AddonModDataEditPage {
 
             return this.dataProvider.getFields(this.data.id);
         }).then((fieldsData) => {
-            this.fields = {};
-            fieldsData.forEach((field) => {
-                this.fields[field.id] = field;
-            });
-
-            this.fieldsArray = fieldsData;
+            this.fields = this.utils.arrayToObject(fieldsData, 'id');
 
             return this.dataHelper.getEntry(this.data, this.entryId, this.offlineActions);
         }).then((entry) => {
@@ -167,11 +162,7 @@ export class AddonModDataEditPage {
                 entry = entry.entry;
 
                 // Index contents by fieldid.
-                const contents = {};
-                entry.contents.forEach((field) => {
-                    contents[field.fieldid] = field;
-                });
-                entry.contents = contents;
+                entry.contents = this.utils.arrayToObject(entry.contents, 'fieldid');
             } else {
                 entry = {
                     contents: {}
@@ -185,8 +176,6 @@ export class AddonModDataEditPage {
             this.editFormRender = this.displayEditFields();
         }).catch((message) => {
             this.domUtils.showErrorModalDefault(message, 'core.course.errorgetmodule', true);
-
-            return Promise.reject(null);
         }).finally(() => {
             this.loaded = true;
         });
diff --git a/src/addon/mod/data/pages/entry/entry.ts b/src/addon/mod/data/pages/entry/entry.ts
index c6e4c8cb5..b43816471 100644
--- a/src/addon/mod/data/pages/entry/entry.ts
+++ b/src/addon/mod/data/pages/entry/entry.ts
@@ -126,6 +126,8 @@ export class AddonModDataEntryPage implements OnDestroy {
      * @return {Promise<any>}         Resolved when done.
      */
     protected fetchEntryData(refresh?: boolean): Promise<any> {
+        let fieldsArray;
+
         return this.dataProvider.getDatabase(this.courseId, this.module.id).then((data) => {
             this.title = data.name || this.title;
             this.data = data;
@@ -155,10 +157,7 @@ export class AddonModDataEntryPage implements OnDestroy {
             this.hasOffline = !!actions.length;
 
             return this.dataProvider.getFields(this.data.id).then((fieldsData) => {
-                this.fields = {};
-                fieldsData.forEach((field) => {
-                    this.fields[field.id] = field;
-                });
+                this.fields = this.utils.arrayToObject(fieldsData, 'id');
 
                 return this.dataHelper.getEntry(this.data, this.entryId, this.offlineActions);
             });
@@ -167,20 +166,15 @@ export class AddonModDataEntryPage implements OnDestroy {
             this.cssTemplate = this.dataHelper.prefixCSS(this.data.csstemplate, '.' + this.cssClass);
 
             // Index contents by fieldid.
-            const contents = {};
-            entry.contents.forEach((field) => {
-                contents[field.fieldid] = field;
-            });
-            entry.contents = contents;
+            entry.contents = this.utils.arrayToObject(entry.contents, 'fieldid');
 
-            const fieldsArray = this.utils.objectToArray(this.fields);
+            fieldsArray = this.utils.objectToArray(this.fields);
 
             return this.dataHelper.applyOfflineActions(entry, this.offlineActions, fieldsArray);
         }).then((entryData) => {
             this.entry = entryData;
 
-            const actions = this.dataHelper.getActions(this.data, this.access, this.entry),
-                fieldsArray = this.utils.objectToArray(this.fields);
+            const actions = this.dataHelper.getActions(this.data, this.access, this.entry);
 
             this.entryRendered = this.dataHelper.displayShowFields(this.data.singletemplate, fieldsArray,
                     this.entry, 'show', actions);
@@ -207,8 +201,6 @@ export class AddonModDataEntryPage implements OnDestroy {
             }
 
             this.domUtils.showErrorModalDefault(message, 'core.course.errorgetmodule', true);
-
-            return Promise.reject(null);
         }).finally(() => {
             this.content && this.content.scrollToTop();
             this.entryLoaded = true;
diff --git a/src/addon/mod/data/pages/search/search.ts b/src/addon/mod/data/pages/search/search.ts
index df40db75a..160f0ad59 100644
--- a/src/addon/mod/data/pages/search/search.ts
+++ b/src/addon/mod/data/pages/search/search.ts
@@ -17,6 +17,7 @@ import { IonicPage, NavParams, ViewController } from 'ionic-angular';
 import { FormBuilder, FormGroup } from '@angular/forms';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreDomUtilsProvider } from '@providers/utils/dom';
+import { CoreTextUtilsProvider } from '@providers/utils/text';
 import { AddonModDataComponentsModule } from '../../components/components.module';
 import { AddonModDataFieldsDelegate } from '../../providers/fields-delegate';
 
@@ -39,14 +40,15 @@ export class AddonModDataSearchPage {
     fieldsArray: any;
 
     constructor(params: NavParams, private viewCtrl: ViewController, fb: FormBuilder, protected utils: CoreUtilsProvider,
-            protected domUtils: CoreDomUtilsProvider, protected fieldsDelegate: AddonModDataFieldsDelegate) {
+            protected domUtils: CoreDomUtilsProvider, protected fieldsDelegate: AddonModDataFieldsDelegate,
+            protected textUtils: CoreTextUtilsProvider) {
         this.search = params.get('search');
         this.fields = params.get('fields');
         this.data = params.get('data');
 
         const advanced = {};
         this.search.advanced.forEach((field) => {
-            advanced[field.name] = field.value ? JSON.parse(field.value) : '';
+            advanced[field.name] = field.value ? this.textUtils.parseJSON(field.value) : '';
         });
         this.search.advanced = advanced;
 
diff --git a/src/addon/mod/data/providers/approve-link-handler.ts b/src/addon/mod/data/providers/approve-link-handler.ts
index bd3c9c71a..5e7a88a7d 100644
--- a/src/addon/mod/data/providers/approve-link-handler.ts
+++ b/src/addon/mod/data/providers/approve-link-handler.ts
@@ -76,7 +76,6 @@ export class AddonModDataApproveLinkHandler extends CoreContentLinksHandlerBase
 
                     // Approve/disapprove entry.
                     return this.dataProvider.approveEntry(dataId, entryId, approve, courseId, siteId).catch((message) => {
-                        modal.dismiss();
                         this.domUtils.showErrorModalDefault(message, 'addon.mod_data.errorapproving', true);
 
                         return Promise.reject(null);
@@ -90,11 +89,9 @@ export class AddonModDataApproveLinkHandler extends CoreContentLinksHandlerBase
                 }).then(() => {
                     this.eventsProvider.trigger(AddonModDataProvider.ENTRY_CHANGED, {dataId: dataId, entryId: entryId}, siteId);
 
-                    modal.dismiss();
                     this.domUtils.showToast(approve ? 'addon.mod_data.recordapproved' : 'addon.mod_data.recorddisapproved', true,
                         3000);
                 }).finally(() => {
-                    // Just in case. In fact we need to dismiss the modal before showing a toast or error message.
                     modal.dismiss();
                 });
             }
diff --git a/src/addon/mod/data/providers/data.ts b/src/addon/mod/data/providers/data.ts
index 5c665e605..4632f2f36 100644
--- a/src/addon/mod/data/providers/data.ts
+++ b/src/addon/mod/data/providers/data.ts
@@ -724,7 +724,7 @@ export class AddonModDataProvider {
 
     /**
      * Invalidate the prefetched content.
-     * To invalidate files, use AddonDataProvider#invalidateFiles.
+     * To invalidate files, use AddonModDataProvider#invalidateFiles.
      *
      * @param  {number} moduleId The module ID.
      * @param  {number} courseId Course ID of the module.
diff --git a/src/addon/mod/data/providers/delete-link-handler.ts b/src/addon/mod/data/providers/delete-link-handler.ts
index 43af7fb8a..9338d7817 100644
--- a/src/addon/mod/data/providers/delete-link-handler.ts
+++ b/src/addon/mod/data/providers/delete-link-handler.ts
@@ -75,7 +75,6 @@ export class AddonModDataDeleteLinkHandler extends CoreContentLinksHandlerBase {
 
                     // Delete entry.
                     return this.dataProvider.deleteEntry(dataId, entryId, courseId, siteId).catch((message) => {
-                        modal.dismiss();
                         this.domUtils.showErrorModalDefault(message, 'addon.mod_data.errordeleting', true);
 
                         return Promise.reject(null);
@@ -90,10 +89,8 @@ export class AddonModDataDeleteLinkHandler extends CoreContentLinksHandlerBase {
                     this.eventsProvider.trigger(AddonModDataProvider.ENTRY_CHANGED, {dataId: dataId, entryId: entryId,
                         deleted: true}, siteId);
 
-                    modal.dismiss();
                     this.domUtils.showToast('addon.mod_data.recorddeleted', true, 3000);
                 }).finally(() => {
-                    // Just in case. In fact we need to dismiss the modal before showing a toast or error message.
                     modal.dismiss();
                 });
             }
diff --git a/src/addon/mod/data/providers/edit-link-handler.ts b/src/addon/mod/data/providers/edit-link-handler.ts
index 448035aeb..b6857f3ab 100644
--- a/src/addon/mod/data/providers/edit-link-handler.ts
+++ b/src/addon/mod/data/providers/edit-link-handler.ts
@@ -53,17 +53,16 @@ export class AddonModDataEditLinkHandler extends CoreContentLinksHandlerBase {
                     rId = parseInt(params.rid, 10) || false;
 
                 this.courseProvider.getModuleBasicInfoByInstance(dataId, 'data', siteId).then((module) => {
-                    const stateParams = {
-                        moduleId: module.id,
+                    const pageParams = {
                         module: module,
                         courseId: module.course
                     };
 
                     if (rId) {
-                        stateParams['entryId'] = rId;
+                        pageParams['entryId'] = rId;
                     }
 
-                    return this.linkHelper.goInSite(navCtrl, 'AddonModDataEditPage', stateParams, siteId);
+                    return this.linkHelper.goInSite(navCtrl, 'AddonModDataEditPage', pageParams, siteId);
                 }).finally(() => {
                     // Just in case. In fact we need to dismiss the modal before showing a toast or error message.
                     modal.dismiss();
diff --git a/src/addon/mod/data/providers/fields-delegate.ts b/src/addon/mod/data/providers/fields-delegate.ts
index a72f0ad46..43f2895c5 100644
--- a/src/addon/mod/data/providers/fields-delegate.ts
+++ b/src/addon/mod/data/providers/fields-delegate.ts
@@ -186,10 +186,6 @@ export class AddonModDataFieldsDelegate extends CoreDelegate {
      * @return {Promise<void>}           Promise rejected if has changed, resolved if no changes.
      */
     hasFieldDataChanged(field: any, inputData: any, originalFieldData: any): Promise<void> {
-        if (!this.hasFunction(field.type, 'hasFieldDataChanged')) {
-            return Promise.resolve();
-        }
-
         return Promise.resolve(this.executeFunctionOnEnabled(field.type, 'hasFieldDataChanged',
                 [field, inputData, originalFieldData])).then((result) => {
             return result ? Promise.reject(null) : Promise.resolve();
@@ -216,7 +212,7 @@ export class AddonModDataFieldsDelegate extends CoreDelegate {
      * @return {any}                     Data overriden
      */
     overrideData(field: any, originalContent: any, offlineContent: any, offlineFiles?: any): any {
-        if (!offlineContent || !this.hasFunction(field.type, 'overrideData')) {
+        if (!offlineContent) {
             return originalContent;
         }
 
diff --git a/src/addon/mod/data/providers/helper.ts b/src/addon/mod/data/providers/helper.ts
index 96f049947..dd152ae51 100644
--- a/src/addon/mod/data/providers/helper.ts
+++ b/src/addon/mod/data/providers/helper.ts
@@ -13,9 +13,10 @@
 // limitations under the License.
 
 import { Injectable } from '@angular/core';
-import { CoreSitesProvider } from '@providers/sites';
-import { CoreFileUploaderProvider } from '@core/fileuploader/providers/fileuploader';
 import { TranslateService } from '@ngx-translate/core';
+import { CoreSitesProvider } from '@providers/sites';
+import { CoreTextUtilsProvider } from '@providers/utils/text';
+import { CoreFileUploaderProvider } from '@core/fileuploader/providers/fileuploader';
 import { AddonModDataFieldsDelegate } from './fields-delegate';
 import { AddonModDataOfflineProvider } from './offline';
 import { AddonModDataProvider } from './data';
@@ -28,7 +29,8 @@ export class AddonModDataHelperProvider {
 
     constructor(private sitesProvider: CoreSitesProvider, protected dataProvider: AddonModDataProvider,
         private translate: TranslateService, private fieldsDelegate: AddonModDataFieldsDelegate,
-        private dataOffline: AddonModDataOfflineProvider, private fileUploaderProvider: CoreFileUploaderProvider) { }
+        private dataOffline: AddonModDataOfflineProvider, private fileUploaderProvider: CoreFileUploaderProvider,
+        private textUtils: CoreTextUtilsProvider) { }
 
     /**
      * Returns the record with the offline actions applied.
@@ -62,9 +64,10 @@ export class AddonModDataHelperProvider {
                         }
 
                         if (offlineContent.subfield) {
-                            offlineContents[offlineContent.fieldid][offlineContent.subfield] = JSON.parse(offlineContent.value);
+                            offlineContents[offlineContent.fieldid][offlineContent.subfield] =
+                                this.textUtils.parseJSON(offlineContent.value);
                         } else {
-                            offlineContents[offlineContent.fieldid][''] = JSON.parse(offlineContent.value);
+                            offlineContents[offlineContent.fieldid][''] = this.textUtils.parseJSON(offlineContent.value);
                         }
                     });
 
diff --git a/src/addon/mod/data/providers/prefetch-handler.ts b/src/addon/mod/data/providers/prefetch-handler.ts
index fbd8921ce..81413449f 100644
--- a/src/addon/mod/data/providers/prefetch-handler.ts
+++ b/src/addon/mod/data/providers/prefetch-handler.ts
@@ -238,7 +238,11 @@ export class AddonModDataPrefetchHandler extends CoreCourseModulePrefetchHandler
      * @return {Promise<any>} Promise resolved when invalidated.
      */
     invalidateModule(module: any, courseId: number): Promise<any> {
-        return this.dataProvider.invalidateDatabaseData(courseId);
+        const promises = [];
+        promises.push(this.dataProvider.invalidateDatabaseData(courseId));
+        promises.push(this.dataProvider.invalidateDatabaseAccessInformationData(module.instance));
+
+        return Promise.all(promises);
     }
 
     /**
diff --git a/src/addon/mod/data/providers/show-link-handler.ts b/src/addon/mod/data/providers/show-link-handler.ts
index 702a03345..1d30f33ea 100644
--- a/src/addon/mod/data/providers/show-link-handler.ts
+++ b/src/addon/mod/data/providers/show-link-handler.ts
@@ -55,23 +55,22 @@ export class AddonModDataShowLinkHandler extends CoreContentLinksHandlerBase {
                     page = parseInt(params.page, 10) || false;
 
                 this.courseProvider.getModuleBasicInfoByInstance(dataId, 'data', siteId).then((module) => {
-                    const stateParams = {
-                        moduleId: module.id,
+                    const pageParams = {
                         module: module,
                         courseId: module.course
                     };
 
                     if (group) {
-                        stateParams['group'] = group;
+                        pageParams['group'] = group;
                     }
 
                     if (params.mode && params.mode == 'single') {
-                        stateParams['page'] = page || 1;
+                        pageParams['page'] = page || 1;
                     } else if (rId) {
-                        stateParams['entryId'] = rId;
+                        pageParams['entryId'] = rId;
                     }
 
-                    return this.linkHelper.goInSite(navCtrl, 'AddonModDataEntryPage', stateParams, siteId);
+                    return this.linkHelper.goInSite(navCtrl, 'AddonModDataEntryPage', pageParams, siteId);
                 }).finally(() => {
                     // Just in case. In fact we need to dismiss the modal before showing a toast or error message.
                     modal.dismiss();
diff --git a/src/addon/mod/data/providers/sync.ts b/src/addon/mod/data/providers/sync.ts
index 3a7ccfb0f..e29f29ab6 100644
--- a/src/addon/mod/data/providers/sync.ts
+++ b/src/addon/mod/data/providers/sync.ts
@@ -251,7 +251,7 @@ export class AddonModDataSyncProvider extends CoreSyncBaseProvider {
                 if (action.fields) {
                     action.fields.forEach((field) => {
                         // Upload Files if asked.
-                        const value = JSON.parse(field.value);
+                        const value = this.textUtils.parseJSON(field.value);
                         if (value.online || value.offline) {
                             let files = value.online || [];
                             const fileProm = value.offline ? this.dataHelper.getStoredFiles(action.dataid, entryId, field.fieldid) :