I'm trying to run my flutter-app in web. So I created a web folder and added all the necessary things. Since I'm using the objectBox in multiple dart files, I'm getting error based on ObjectBox.
So what I did to find the issue was, In the main.dart file i'm just trying to display only simple Container widget containing a text. But still I'm getting the same error related to objectBox with its entity.
So my doubt is, Is it compiling all the dart files located in lib? If then, can I exclude them.
I have tried(created a build.yaml file) to exclude all my files which are using ObjectBox.
My build.yaml file:
targets:
$default:
sources:
exclude:
- lib/test_driver/runner.dart
- lib/tools/**.dart
Related
I'm making a library for persistence implementation. For that I want to use reflection to be able to restore an object from the storage.
I can't use dart:mirrors because this library will be use also in Flutter application. So I'm trying to use reflectable package. And here I'm getting a major issue with understanding of how it should work. The doc tells reflectable uses build package and that some files must be generated. But I couldn't find anywhere whether this generation should happen for each file in my library package or just those where reflectable is used.
My library project structure is standard:
/examples
/lib
/lib/src
/lib/my_package.dart
/test
/pubspec.yaml
When I run dart run build_runner or dart run build_runner lib from the project root I see for each file in /example and /tests a matching file is generated. But in /lib folder nothing is generated. Only file where I'm intending to use reflectable is /lib/src/persistence/persistence_model.dart. I've created a file /lib/build.yaml of following content:
targets:
$default:
builders:
reflectable:
generate_for:
- src/persistence/persistence_model.dart
options:
formatted: true
but it seems to have no effect.
So, what should be right approach?
And probably a side question or rather consideration: isn't using reflection in Dart and Flutter excessively complex comparing to other languages (Python, C#, Java)?
Iam using the latest version of objectbox and when i run the "flutter pub run build_runner build" command i get this output: "...Failed to find package root from output directory, generated imports might be incorrect..."
So when i write in main to init ObjectBox:
late ObjectBox objectBox;
ObjectBox is not recognized with import.
Using the import from an tutorial which have the same version does not solve the problem,but the json and g.dart files are generated.
What iam doing wrong?
Let me know if you need more information!
Thanks
You will get the error you are seeing if your ObjectBox files are in the wrong directory. By default, ObjectBox expects objectbox.dart, objectbox.g.dart, and objectbox-model.json to be at the root of your project (i.e. in the lib directory next to the main.dart file. You can move objectbox.dart though. I typically put it in lib/objectbox, but I think that objectbox.dart and the generated files need to exist in the same directory, though I'm not 100% sure about that. Change the directory where objectbox.g.dart and objectbox-model.json are generated by following the instructions below from the ObjectBox README.md. If you wanted to put the files in lib/objectbox you would just change custom to objectbox in the code snippet below:
To customize the directory (relative to the package root) where the
generated files are written, add the following to your pubspec.yaml:
objectbox:
# Writes objectbox-model.json and objectbox.g.dart to lib/custom (and test/custom).
output_dir: custom
# Or optionally specify the lib and test output folder separately.
# output_dir:
# lib: custom
# test: other
So I have received a project which requires e-commerce, food ordering and car hailing services like Grab to be inside one app. I have delivered all these 3 apps in different projects before and for this new project I'm wondering whether it is possible to combine all my previous source code into one project, running on different dependencies.
You can create packages for all 3 modules (food, e-commerce, car-hailing services)
To create a Flutter package, use the --template=package flag with flutter create:
flutter create --template=package food
Folder Structure
lib
packages
- food
- e_commerce
- car_hailing_service
Import this in the main module's pubspec.yaml file
dependencies:
flutter:
sdk: flutter
# My Custom Packages
food:
path: packages/food
e_commerce:
path: packages/e_commerce
car_hailing_service:
path: packages/car_hailing_service
If you have any common functionalities for all 3 packages then create a separate package for that also and import that common package for all 3 packages.
Refer to this document for creating flutter packages. I hope this helps you.
I have stumbled upon a problem in importing the package in Flutter, I tried to solve this by running flutter packages get and also shutting down the project in Android studio and reopening it.
import 'package:task_02_category_widget/category.dart';
Here is the line above, and the error I'm running into when I run it gives the following error in the console.
Your application could not be compiled, because its dependencies could
not be established.
The following Dart file:
/Users/username/Documents/flutter_rectangle_2/lib/main.dart
...refers, in an import, to the following library:
package:task_02_category_widget/category.dart
That library is in a package that is not known. Maybe you forgot to
mention it in your pubspec.yaml file?
If task_02_category_widget/category.dart is part of an old project you are reusing you should put it in a folder in your flutter application and include it like "../ folder /task_02_category_widget/category.dart ". If it is part of github repository you have copy pasted from, just copy the file and use the step above. Most probably you are looking for that . In any other case check here to find the source code.
You should have in your project at a file called pubspec.yaml a definition like this:
name: my_app
dependencies:
task_02_category_widget:
Let’s say that your package is laid out as follows:
task_02_category_widget/
lib/
category.dart
Then, you can import it:
import 'package:task_02_category_widget/category.dart';
More information:
https://www.dartlang.org/tools/pub/get-started
https://www.dartlang.org/guides/libraries/create-library-packages
How do I create a package in the new Dart Editor?
There is no "Add Pub support" checkbox?
Also how to create "packages" with the new editor?
Is a tutorial out there that describes the process with the new Editor?
To create a package named mypackage.
For Dart package:
dart create --template=package-simple mypackage
For Flutter package:
flutter create --template=package mypackage
From the Dart/Flutter Documentation:
Step 1: Create the package
To create a Flutter package, use the --template=package flag with flutter create:
flutter create --template=package hello
This creates a package project in the hello folder with the following content:
LICENSE
A (mostly) empty license text file.
test/hello_test.dart
The unit tests for the package.
hello.iml
A configuration file used by the IntelliJ IDEs.
.gitignore
A hidden file that tells Git which files or folders to ignore in a project.
.metadata
A hidden file used by IDEs to track the properties of the Flutter project.
pubspec.yaml
A yaml file containing metadata that specifies the package’s dependencies. Used by the pub tool.
README.md
A starter markdown file that briefly describes the package’s purpose.
lib/hello.dart
A starter app containing Dart code for the package.
.idea/modules.xml, .idea/modules.xml, .idea/workspace.xml**
A hidden folder containing configuration files for the IntelliJ IDEs.
CHANGELOG.md
A (mostly) empty markdown file for tracking version changes to the package.
There's no such possibilty in the Dart Editor for now. To create a package follow these steps :
create an New Application mylib without sample content
add a pubspec.yaml file
add a lib folder
create a mylib.dart containing the code you want to package
See the Package layout conventions for more informations.
You can create a dart project following the flutter way that allow you to auto generate the structure and the hierarchy of the package.
Follow below steps to create a package in DART:
Step 1: Create the package
$ flutter create --template=package hello
Step 2: Implement the package
For pure Dart packages, simply add the functionality inside the main lib/.dart file, or in several files in the lib directory.
To test the package, add unit tests in a test directory.
For additional details on how to organize the package contents, see the Dart library package documentation:
https://flutter.dev/docs/development/packages-and-plugins/developing-packages
Any dart app is a package. To create a new Dart app use:
dart create my_package