Category: Gorm_unique

Gorm_unique

23.10.2020 By Mujind

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've included my domains below. I'm trying to specify a unique constraint on a column that would make the column unique based on the value of another column, and unique within the parent domain.

Right now the postStatus is unique within the postType, but it applies the unique constraint to the Post table. So the table allows one postStatus per postType and then a unique constraint violation occurs. What I need is one unique postStatus per postType for each Profile.

Essentially I'm trying to get at a compound unique key:. Learn more. Asked 7 years ago. Active 7 years ago. Viewed 5k times. Essentially I'm trying to get at a compound unique key: profile. Active Oldest Votes. Svetozar Misljencevic Svetozar Misljencevic 5 5 silver badges 9 9 bronze badges. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs. Featured on Meta. Responding to the Lavender Letter and commitments moving forward. Related Hot Network Questions.

Question feed. Stack Overflow works best with JavaScript enabled.In this article, I want to talk about a subtle problem in the unique index support for Gorm. For more context, let's first briefly discuss Database Indexes and how Gorm supports them. Feel free to skip the next few sections if you already know about them, or you are not interested. Depending on the specific database, there can be various types of indexes.

For instance, one of the most commonly used indexes is the Primary Index that automatically gets created. It stores just the Primary key s of the Table and lets you quickly query the data using it. Another use of Indexes is to put some constraints on the data. The Unique Index is one such example that enforces the uniqueness across one or more columns of the Table.

Let's take an example of an E-Commerce website to discuss Unique Indexes further. Then the constraint can be enforced in the Database using a Unique Index. The website might choose to be a little lenient and allow the same Credit Card on multiple Accounts. However, one Credit Card can only be added to the Account once. To enforce this constraint, we need to use a Composite Unique Index.

A Composite Unique Index enforces the uniqueness of the set of columns instead of a single column. In this case, the Index will allow only a single pair of User Account and Credit Card relationship, but other Accounts can still add the same Credit Card.

Gorm uses reflection to identify information like datatype. So, a regular Golang struct is already a Gorm model. However, Gorm defines a custom struct tag for passing in additional information about a specific column of the model.

This additional information can be a constraint like NOT NULLexplicitly specifying the data type to use, and relation information, among other things. The value of this tag will be the name of the Index.

In the case of Composite Indexes, you need to set the same index name for multiple fields. Gorm will detect it, and it will create a Composite Index on those fields. The previous example can be modeled in Gorm as follows.

Notice the AutoMigrate method being invoked to perform the migration. According to the official documentationthis is the default way in Gorm for migrating the models. Now, the problem with this method is that it does not return an error. The documentation shows that it returns a pointer to the Database. So, if there are any failures while migrating, the users won't know about it.

Let's try to create a scenario where this can happen.

gorm_unique

I'll modify the models by adding the same Unique Index in both the models. This should not work because Indexes are database scoped, and so the names must be unique in a database. Gorm will try to create the Unique Index with the same name twice, which will result in an error.

gorm_unique

But wait, how will we know if Gorm encounters an error? Turns out, Gorm has a debugging mode which logs all the SQL interactions. So, let's modify the call to enable the logs.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. ID as the table is dropped due to a batch job so the unique values are the sku and the merchant id.

What I want to achieve is that a product can be in many ListProducts groupings but only once per grouping. So the work around I got was to remove the dependency on the unique constraint. This would also block parrallel lookups as the table is huge. Took some inspiration from Performance Collections. Learn more. Asked 6 years, 7 months ago. Active 6 years, 7 months ago. Viewed 1k times. Grails v2.

Any ideas? So this domain object that you show here represents a grouping? So i refactored the code so that the catLists domain object adds and removes items from its list. If somebody deletes the list then all the references from the ListProducts table is also removed.

I took some inspiration from this blog mrpaulwoods. Active Oldest Votes.

Declaring Models

You can use unique constraint in domain class which looks like domain1 unique:"domain2" Both domain1 and domain2 must be a object not collection. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs. Featured on Meta. Responding to the Lavender Letter and commitments moving forward.

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