In many classes in my project, I have a String description and static mapping = { description sqlType: 'MEDIUMTEXT' }.
Is there anyway to declare a StringMediumText description which automatically links to a column in the database with sqlType: 'MEDIUMTEXT'?
So in the future I just need to declare:
Person {
StringMediumText description
}
You can do it by defining your own Hibernate user type
class Person {
String description
static mapping = {
description type: StringMediumTextType
}
}
You find everything regarding your question in the Reference Guide. Hope this helps
Related
I'm new to Grails. I'm developing a web app that handles the records of a gymnasium, to make routines, exercises, etc.
I have this domain class Ejercicios:
class Ejercicios {
String nombreEjercicio
String idHoja
String descripcion
List<String> descripcionO
static hasMany = [descripcionO: Descripciones]
static transients = ['descripcionTrans']
String descripcionTrans
static mapping = {
id column: "idHoja"
version false
}
static constraints = {
nombreEjercicio maxSize: 45
idHoja blank: false
}
The database table has the default Grails id named "idHoja", and another attribute named "id_hoja"
The thing here is that when I make a JSON parse from the rest API, I need GORM to look for exercises via the "id_hoja" attribute, not the "idHoja" because it'll cause a mismatch.
I found the solution by myself!
The only thing I needed to was to make the JSON call with the name "idHoja" and that was it.
I have a small grails service that I created, and I am trying to use the type:'text' on a member of a model. I always see this field come up as a varchar(255) however, even though I have dropped the database and had it recreated.
I essentially have:
class eventParameter{
static belongsTo = [logEvent:LogEvent]
String name
String value
static constraints = {
name blank:false
value blank:false
}
static mapping = {
value type:'text'
}
}
Does anyone have any idea why this does not create the right type of column?
To override the underlying database type, use the sqlType mapping. For example:
static mapping = {
value sqlType:'text'
}
Also, check out the relevant section of the Grails Manual: 5.5.2.10 Custom Hibernate Types
I'm creating a (theoretically) simple hasMany relationship within a domain class. I have two tables with a foreign key relationship between the two. Table 1's domain object is as follows:
Functionality{
String id
static hasMany = [functionalityControllers:FunctionalityController]
static mapping =
{
table 'schema.functionality'
id column:'FUNCTIONALITY_NAME', type:'string', generator:'assigned'
version false
}
}
and domain object 2
FunctionalityController
{
String id
String functionalityName
String controllerName
static mapping =
{
table 'schema.functionality_controller'
id column:'id', type:'string', generator:'assigned'
version:false
}
}
The issue I am having is that when I have the hasMany line inside of the Functionality domain object, the app won't start (both the app and the integration tests). The error is org.springframework.beans.factory.BeanCreationException leading to Invocation of init method failed; nested exception is java.lang.NullPointerException.
Any help would be appreciated.
UPDATE:
*Working Domains*:
class Functionality {
String id
static hasMany = [functionalityConts:FunctionalityCont]
static mapping =
{
table 'schema.functionality'
id column:'FUNCTIONALITY_NAME', type: 'string', generator: 'assigned'
functionalityConts( column:'functionality_name')
version false;
}
}
and
class FunctionalityCont {
String id
String functionalityName
String controllerName
static belongsTo = [functionality: Functionality]
static contraints = {
}
static mapping =
{
table 'schema.functionality_controller'
id column:'id', type: 'string', generator: 'assigned'
functionality(column:'FUNCTIONALITY_NAME')
version false;
}
}
Well 2 things...
1.I'm not sure but I guess that your domain class with the prefix 'Controller' maybe is the responsible, this is because grails is convention over configuration and by convention the controller class ends with Controller prefix and are in the controller folder, in this case is a lil' confusing
2.In GORM and in this case the relationship between objects can be unidirectional or bidirectional, is your decision to choose one, but in both cases there are different implementations, the class Functionality(btw is missing the 'class' word) has the right relationship to FunctionalityController through hasMany, but FunctionalityController doesn't knows about the relationship, so you can implement:
// For unidirectional
static belongsTo = Functionality
// For bidirectional
static belongsTo = [functionality:Functionality]
// Or put an instance of Functionality in your domain class,
// not common, and you manage the relationship
Functionality functionality
So check it out and tell us pls...
Regards
Try adding
static belongsTo = [functionality: Functionality]
to your FunctionalityController class. I suspect there is more to your error than what you've shown, but generally a hasMany needs an owning side to it. Since that is where the foreign key actually lives.
Have been trying to look for an answer for hours, but have so far not managed to come up with an adequate solution, so I'm hoping someone here might have some more experience with Grails, and implementing custom relationships in it.
My problem is that I have two classes:
Company
OrderConfig
OrderConfig contains two references to Company. 1 for a consignee, 1 for a shipper. I implemented the relationship (see below), and everything looks dandy, with my order_config table containing both a consignee_company_id column and a shipper_company_id column.
However, I do not want or need a company_id column at all. I would prefer using the CompanyName as the identifying column. How can I prevent Grails from automatically adding the id column to the company table, and instead use the companyName column as the primary key, thus ensuring my order_config table will be generated containing the companyName and not the company_id?
I tried embedding the company in the orderconfig class, and wrestled with all kinds of other options including the mappings, however I ran into trouble with each and every one of them.
Thanks in advance!
My code so far:
class OrderConfig {
static hasMany = [consignee:Company, shipper:Company]
String toString() {
return "${consignee}"
}
static constraints = {
consignee (blank:false, maxSize:10)
shipper (blank:false, maxSize:10)
}
Company consignee
Company shipper
}
class Company {
String toString() {
return "${companyName}"
}
static constraints = {
companyName(blank:false, maxSize:10)
companyAddress1(blank:false, maxSize:40)
companyAddress2(blank:false, maxSize:40)
companyAddress3(blank:false, maxSize:40)
companyAddress4(blank:false, maxSize:40)
companyZipCode(blank:false, maxSize:36)
companyCountry(blank:false, maxSize:36)
}
String companyName
String companyAddress1
String companyAddress2
String companyAddress3
String companyAddress4
String companyZipCode
String companyCountry
}
You need to look at the advanced GORM config options in the documentation, in section 5.5.2.1
There is an example
class Person {
String firstName
static hasMany = [addresses:Address]
static mapping = {
table 'people'
firstName column:'First_Name'
addresses joinTable:[name:'Person_Addresses', key:'Person_Id', column:'Address_Id']
}
}
there you can see how they are specifying the key and column name on which to do the stuff.
Edit -- I reread your question: if you are asking how to change it so Company has an assigned id, you might be able to do something like this example
static mapping = {
id generator:'assigned', column:'column_name',name:'propertyName'
}
where more options are available here: http://www.grails.org/doc/1.3.x/ref/Database%20Mapping/id.html
I have to implement map values in my Grails app.
I have a class that can contain 0..N OsmTags, and the key is unique.
In Java I would model this with a Map in each object, but I don't know how to map classes in Grails.
So I defined this class:
class OsmTag {
/** OSM tag name, e.g. natural */
String key
/** OSM tag value, e.g. park */
String value
static constraints = {
key blank:false, size:2..80,matches:/[\S]+/, unique:false
value blank:false, size:1..250,matches:/[\S]+/, unique:false
}
}
That works ok, but it's actually quite ugly because the tag key is not unique.
Is there a better way to model this issue?
Cheers
If your tags are simple strings, then you can use a map directly.
class Taggable {
Map tags // key : String, value : String
}
If I understand your question correctly, then you want to ensure that each tag is unique within a particular instance of the tagged entity?
Assume that the entity to which the tags are attached is named Taggable, then
you can enforce this requirement using a custom constraint:
class Taggable {
static hasMany = [ tags: OsmTag ]
}
class OsmTag {
static belongsTo = [ taggable: Taggable ]
/** OSM tag name, e.g. natural */
String key
/** OSM tag value, e.g. park */
String value
static constraints = {
key(blank:false, size:2..80,matches:/[\S]+/, unique:false,
validator: { val, obj ->
if (obj.taggable.tags.key.count(val > 1)) {
return false
}
}
)
value(blank:false, size:1..250,matches:/[\S]+/, unique:false)
}
}
If you're looking for a NoSQL solution, you could try using MongoDB with Grails. The most recent version (1.4) supports Geospatial indexing and querying.