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QUESTION
this is my model
...ANSWER
Answered 2022-Mar-22 at 05:07There’s no string data type in postgre. Change string[] to text[]
QUESTION
I am new to ORM (and GORM) so apologies if this is an obvious question, but it does not seem to be covered by the documentation.
I will be using the examples from the documentation as a base to my questions
Question 1: Belongs To ...ANSWER
Answered 2022-Mar-17 at 10:07Q1: Based on how you defined your structs, you don't need an explicit O2M relationship in the Company struct, but when loading Company details, if you want to load all users that are assigned to that specific company, you need to add that field as well. It will need an additional function call like Preload or Joins, but you shouldn't need an explicit definition of this relationship.
QUESTION
I have a singleton service which could generate error only at first call and then it returns already created instance.
Service looks like below:
...ANSWER
Answered 2022-Mar-02 at 09:41If the error occurs (only once), your databaseSingleton will not be setup. You should return the error in all cases.
Although this isn't something you can do anything about (since the attempt to initialize databaseSingleton will not be repeated due to the use of sync.Once), you could as well halt the app.
In fact, there is no point deferring this initialization, you could just do it during package init, and terminate if it fails. And if it succeeds, you could use databaseSingleton without having to check error of the initialization.
So simply do it like this:
QUESTION
I am writing a backend API that sends to the frontend some JSON data from a database (handled by GORM). The frontend, after some modifications to the content of the fields, sends me back the data also as JSON.
Below is a mock-up of the code
...ANSWER
Answered 2022-Feb-23 at 19:14You can decode the JSON body into a user struct, and then do an update with it.
QUESTION
Below is a program (based on GORM) that defines two database tables (users and cards) with the logic of a user having one card. It then creates the database, fills it in, searches and prints out the only record in it.
My problem: the card in the ultimate search is empty, it is not attached to the user.
From the database perspective everything is OK:
...ANSWER
Answered 2022-Feb-19 at 18:40go-gorm will not load nested objects out of the box and automatically, you will have to specify that you want nested objects loaded. In your case, UserCard is a nested object of User. Here you can see more details on how to do that with the Preload function, but it should look something like this:
QUESTION
New to SQL, I am writing as an exercise an API middleware that checks if the information contained in some headers match a database entry ("token-based authentication"). Database access is based on GORM.
To this, I have defined my ORM as follows:
...ANSWER
Answered 2022-Feb-18 at 13:27The gorm.io documentation says the following on the use of structs in Where conditionals:
When querying with struct, GORM will only query with non-zero fields, that means if your field’s value is
0,'',falseor other zero values, it won’t be used to build query conditions ...
The suggested solution to this is:
To include zero values in the query conditions, you can use a map, which will include all key-values as query conditions ...
So, when the token header or both headers are empty, but you still want to include them in the WHERE clause of the generated query, you need to use a map instead of the struct as the argument to the Where method.
QUESTION
Im trying to create a REST service using Gorm that on startup will drop the database tables from my Postgres DB and then create and populate them with test data. The entities I am using are as follows:
...ANSWER
Answered 2022-Feb-15 at 18:23type Group struct {
ID uuid.UUID `gorm:"PrimaryKey" json:"id"`
Name string `json:"name"`
Sessions []Session `gorm:"foreignKey:GroupID" json:"sessions"
}
type Session struct {
ID uuid.UUID `gorm:"PrimaryKey"`
GroupID uuid.UUID `gorm:"foreignKey:ID"`
Name string
From time.Time
To time.Time
}
QUESTION
I am using gorm with mysql as database with go module like this :
- gorm.io/gorm v1.21.7
- github.com/go-sql-driver/mysql v1.6.0
My system timezone is +07:00 (Asia/Jakarta), and the mysql timezone is using the system timezone itself.
but something wrong happen when I've struct like this
...ANSWER
Answered 2022-Feb-07 at 14:39When connecting to the MySQL database, ensure you leverage the parseTime and loc parameters as per the docs:
to scan MySQL DATE and DATETIME values into time.Time variables, which is the logical equivalent in Go to DATE and DATETIME in MySQL. You can do that by changing the internal output type from []byte to time.Time with the DSN parameter parseTime=true. You can set the default time.Time location with the loc DSN parameter.
to generate a DSN connection strings to set parseTime & loc see i.e.
QUESTION
I have a a table for assignments, one for solutions and another for students. I want to retrieve all assignments and against each I want to add a 'flag' showing that the currently logged-in student has attempted the assignment or not.
I have tried this:
...ANSWER
Answered 2022-Feb-02 at 16:56You just need to list params. Something like this
QUESTION
Using gorm, i created the following models for users and product_prices tables
ANSWER
Answered 2022-Jan-27 at 22:27One possible solution would be to do something like this (assuming your DB tables are named product_prices and users):
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