deferr | A basic Todo app to demonstrate The Clean Architecture | Architecture library
kandi X-RAY | deferr Summary
kandi X-RAY | deferr Summary
A basic Todo app to demonstrate The Clean Architecture.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- This is the main entry point for testing
- Defer sends a request todo repo .
- NewTodoRepo returns a new instance of TodoRepo
- NewTodoManager returns a new TodoManager
- NewWebHandler creates a new WebHandler
deferr Key Features
deferr Examples and Code Snippets
Community Discussions
Trending Discussions on deferr
QUESTION
I use LocalMapTileDataSource and would like to apply custom opacity for tile's images.
As I found there is no way to make it on fly?
Here is my code.
...ANSWER
Answered 2021-Jun-15 at 18:55When you load a tile from a PNG like this, it reads the opacity from each pixel in the PNG. If you want to change the opacity, you would need to update the PNG alpha values in each pixel. There's currently no way to set a global opacity value on an entire tile layer as this would conflict with the opacity information already present in the bitmap.
QUESTION
I have the following model
...ANSWER
Answered 2021-May-15 at 09:02You probably made a typo write writing your model. You must not use : but = when declaring your fields. It should be :
QUESTION
create table T1 (
id bigint NOT NULL primary key,
a bigint unique not null
);
create table T2 (
id int not null primary key,
b bigint,
foreign KEY(id) references T1(id) not deferrable
);
alter table T1 add constraint fk_id foreign key (id) references T2(id) not deferrable;
--Statement 1
with ins as (
insert into T1(id, a) values(15, 4) returning id
)
insert into T2(id, b) values(15, 3);
--Statement 2
with ins as (
insert into T2(id, b) values(14, 4) returning id
)
insert into T1(id, a) values(14, 3);
--Statement 3 (gives error)
with upd as (
update T1 set a = 4 where id = 14 returning id
)
update T1 set a = 3 where id = 15;
ANSWER
Answered 2021-May-03 at 15:31According to the docs non-deferrable unique constraints are checked for each row, contrary to the standards specification that they are checked only at the end of a statement.
When a UNIQUE or PRIMARY KEY constraint is not deferrable, PostgreSQL checks for uniqueness immediately whenever a row is inserted or modified. The SQL standard says that uniqueness should be enforced only at the end of the statement...
But this exception to the standards spec is only for uniqueness, not for foreign key. Foreign key constraints are checked at the end of the statement if they are either not deferrable or if they are deferrable but not deferred. Since any problems have been cured by the end of the statement in your first two examples, there is no error.
QUESTION
I have read some articles and oracle documentation on unique and nonunique indexes. What I understood is Index is Index and constraint is constraint.
Constraint uses the index to ensure data integrity. The primary key uses the unique or nonunique index to ensure that column is unique and not null. The same goes for unique constrain. But constraints can use a non-unique index if we want them deferrable.
The question comes for a unique index, it is just an index and I can not see any constraint associated with it so what is going on internally so the unique index won't allow for duplicate values, it is some internal semantics working as a constraint to ensure index uniqueness?
And let's say a unique index has the ability to be unique without any constraint then I want to understand the relation of constraints with indexes in every sense.
...ANSWER
Answered 2021-Apr-13 at 03:06"There really is no such thing as a nonunique entry in a B*Tree index. In a nonunique index, Oracle simply stores the rowid by appending it to the key as an extra column with a length byte to make the key unique. For example, an index such as CREATE INDEX I ON T(X,Y) is conceptually CREATE UNIQUE INDEX I ON T(X,Y,ROWID). In a unique index, as defined by you, Oracle does not add the rowid to the index key. In a nonunique index, you will find that the data is sorted first by index key values (in the order of the index key) and then by rowid ascending. In a unique index, the data is sorted only by the index key values".
Though unique, primary key constraints and unique indexes both help with uniqueness, their objectives differ.
A unique or primary key constraints are meant to enforce data integrity. They might create a unique index implicitly and then it uses unique index to maintain integrity or it can use nonunique index as the key enforcement. Anyway index (unique or nonunique) always used to support primary key.
A unique index serves to make data access efficient. Its primary purpose is to help performance, but it does maintain uniqueness as a corollary and primary key may use this.
QUESTION
I just noticed that constraints, such as FOREIGN KEY, automatically generate system triggers, and names them RI_ConstraintTrigger_a or _c + trigger oid. I've looked at the docs, but do not see a way to declare names for these triggers in FOREIGN KEY, etc.. I care because I'm writing a bit of check code to compare objects in two different databases. The local names of system triggers vary, since the oids are naturally going to vary.
Is there a way to declare names for these triggers as they're created? If so, is there some harm in doing so? I think that I read that after a restore or upgrade, the trigger and related function names might be regenerated. If so, using RENAME TRIGGER on these items seems like swimming upstream...and I suspect is a Bad Idea.
I suppose that I could locate a trigger's local name by querying pg_trigger on combination of other attributes...but I'm not seeing what makes a trigger unique, apart from it's unique name. All I can think of is to search against pg_get_triggerdef(oid), and compare the outputs.
For those following along at home, here's a "hello world" example that creates a couple of system triggers.
...ANSWER
Answered 2021-Apr-10 at 09:44It is not supported to change the name of these triggers, and there is no support for renaming triggers in general.
There is no point in comparing these trigger names, because they are just implementation details of the foreign key constraint. Constraints can be renamed, and you can get the constraint definition with the pg_get_constraintdef function. That is what you should compare.
QUESTION
How do I perform a migration and have just my existing Entities visualised?
The problem is:
- I removed all versions files from migrations
- I dropped schema public
- I created new schema public
- I made a make:migration
- I made a doctrine:migrations:migrate
And old data appeared - I mean tables which don't have its entities and were dropped long time ago.
Schema is created, but with reduntant and unnecessary data.
How to totally reset migrations? Is there any cache which save dropped tables (not considering versions of migrations)?
Here is my latest migrations file - I want to make a migration and I don't have such tables as for instance user_to_offert_user.
Don't give me manual solutions, please - I know that I can modify it before migration, but it seems pointless to me doing that every time when I will change something.
If something is not clear, ask me please. I tried to specify problem as much as I can.
Additional info:
What I am exactly doing:
- I removed all versions from migrations.
- I truncated all data
- I dropped my public schema
- I created my new public schema
- I run bin/console make:migration
- I run bin/console doctrine:migrations:migrate
And here is my huge problem: I have this kind of entities:
And when I run migrate all of this tables shows:
As as you can see, there are too many tables. Some of them I dropped a long time ago and they still appears in every migration. I don't know how to get by and I am sooo desperate, because I have been spending on this problem 3th day.
I have my database on Heroku - I use Postgres and when I dropped all tablesthey doesn't show in heroku:
Here is code of this migration:
...ANSWER
Answered 2021-Apr-03 at 08:45Doctrine MigrationsBundle has a table where it stores the information which migrations previously ran. If you reset your migrations you will also have to reset that table. You can use the rollup command for this:
QUESTION
So I have a model like this
...ANSWER
Answered 2021-Jan-11 at 07:19self in get_fields is DataSheetSerializer instance not DataSheet model instance. hence it should not have cluster property. you can not access model DataSheet instance in get_fields as it gets fields from class DataSheet not from its instance. you can validate the field like
QUESTION
So I have a model like this
...ANSWER
Answered 2021-Jan-10 at 07:43Adding an is_default=False case get you closer to your conditions.
I tested with Django==3.1.4 and the OR method resulted in this constraint:
QUESTION
I have a django model structured like this.
...ANSWER
Answered 2020-Dec-31 at 13:43One approach is to add a save method to prevent model saving unless role has been defined. For example,
QUESTION
In my WPF WebView2 control, I want to execute the window.open("https://www.google.com") from the main window to open the URL in the child window using the CoreWebView2_NewWindowRequested. But the URL webpage is not getting displayed in the child window instance.
I am quite not sure what is wrong with my below piece of code:
MainWindow.xaml.cs
ANSWER
Answered 2020-Dec-19 at 21:16Comment out (or remove) the following line:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install deferr
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
