grails-constraints | 易学教程

Grails Scaffolding - define possible values for this property of a domain class

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问题 I am new to Grails. I have a Person domain class as : class Person { String firstName String lastName String gender Date dateOfBirth } And wondering if I can define possible values for a property - say gender as {M, F, U} so that these three values will be listed in combo box when using dynamic scaffolding for Person controller. Here I just wanted to know if there is such feature in Grails framework? If such feature exists , then how can I use it? 回答1: From the documentation http://grails.org

How can I select multiple values from the inList constraint in Grails?

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问题 I'm new to Grails and obviously missing something out.. but what?! I created a DomainClass An with a String property category. In the constraints I defined, that this category should have multiple (list) values: class An { String category static constraints = { category nullable: true, inList:["do", "me", "a", "favour"] } } In the view it is shown as a multiple select box: <g:select name="category" from="${anInstance.constraints.category.inList}" value="${anInstance?.category}"

Grails Scaffolding - define possible values for this property of a domain class

阅读更多关于 Grails Scaffolding - define possible values for this property of a domain class

I am new to Grails. I have a Person domain class as : class Person { String firstName String lastName String gender Date dateOfBirth } And wondering if I can define possible values for a property - say gender as {M, F, U} so that these three values will be listed in combo box when using dynamic scaffolding for Person controller. Here I just wanted to know if there is such feature in Grails framework? If such feature exists , then how can I use it? From the documentation http://grails.org/doc/latest/guide/scaffolding.html , you should be able to use an inList constraint: class Person { String

How to set uniqueness at DB level for a one-to-many association?

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问题 My problem is simple but I could not find any GORM syntax for this. Consider the following class: class Article { String text static hasMany = [tags: String] static constraints= { tags(unique: true) //NOT WORKING } } I want to have one unique tag name per article defined in my constraints but I cannot make it with the above syntax. Clearly I need in DB schema something like: create table article_tags (article_id bigint, tags_string varchar(255), unique (article_id , tags_string)) How can I do