I need some help on my API, when I'm on web, the order is saving correct, but when its on API, it goes all wrong:
def test = parseJSON.sort { a, b -> a.ID <=> b.ID } //or dateTime, will print the same
//order when I print each of them
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:1, ID:1, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:0, ID:2, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:0, ID:3, ph:0, redoxPotential:0, temperature:0]
[IDWeb:0, conductivity:0, ReportId:2, dissolvedOxygen:0, levelWater:4, ID:4, ph:0, redoxPotential:0, temperature:0]
test.each{
def sample = new SampleWater()
sample.levelWater = it.levelWater
sample.conductivity = it.conductivity
sample.dissolvedOxygen = it.dissolvedOxygen
sample.redoxPotential = it.redoxPotential
sample.ph = it.ph
sample.temperature = it.temperature
water.addToSamples(sample)
}
return water
My problem is that addTo is not saving in order. How can I solve this?
Make sure you have defined the type of samples as a List in your Water domain class so that we can maintain the insertion order:
class Water {
static hasMany = [samples: Sample]
List<Sample> samples = []
}
class Sample {
def levelWater
}
By default implementation of hasMany is of type Set which does not maintain the insertion order but is responsible for uniqueness.
Since, now you samples will be saved in the same order as they are inserted.
You have to specify with order you want to apply to the list of SampleWater in the "water" domain class.
i.e:
class BlogCategory {
static hasMany = [
entries : BlogEntry
]
static mapping = {
entries: sort:'dateCreated', order:'desc'
}
}
In this example BlogEntry will be ordered respect dateCreated.
Related
I'm relatively new to Grails.
I have the following
class House {
Integer number
Integer maxResidents
static belongsTo = [town: Town]
}
class Town {
String name
static hasMany = [houses: House]
}
I want to get five towns with most Houses. I have seen the possibility to create a criteria but I can't deal with it now. Can someone support?
Thank you!
As you have a bidirectional association you can do this with a query on House:
def result = House.withCriteria {
projections {
groupProperty("town", "town")
rowCount("numHouses")
}
order("numHouses", "desc")
maxResults(5)
}
This would return you a list of results where each result res has the town as res[0] and the number of houses as res[1]. If you'd prefer each result to be a map giving access to res.town and res.numHouses then you should add
resultTransformer(AliasToEntityMapResultTransformer.INSTANCE)
after the maxResults line (along with the appropriate import at the top of your file).
I've read through a lot of posts and docs and must be missing something.
In my application (model below) I am having a data issue that seems to be out of my control where I have a categoryId in the join table JOBORDERCATEGORIES that has no corresponding row in the CATEGORY table. I am accessing the category data through getJobCategories() in the JobOrder. This is producing the following error when my Category table is missing a referenced row:
2012-03-07 08:02:10,223 [quartzScheduler_Worker-1] ERROR listeners.SessionBinderJobListener - Cannot flush Hibernate Sesssion, error will be ignored
org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.matrixres.domain.Category#416191]
and my code is halting.
I have tried using ignoreNotFound but it is not helping me to get past the error above.
If I missed a post on the solution to this problem please link me to it otherwise thoughts are welcome on how to move forward. Perhaps there is a more direct route I will have to hammer in to achieve my goal of getting a good category list, but I am not familiar enough with the framework to know what is next. As a note, I cannot write to any of these tables.
thanks, rich
A simplified Version of my Model:
Job Order Object:
class JobOrder {
def getJobCategories() {
def cats = []
try {
def jocategories = this.categories
if(!jocategories.isEmpty() && jocategories!=null){
println "we got categories for ${this.id}"
jocategories.each { cat ->
if(cat?.parentCategoryID == 0){
if(cat.occupation != null){
cats << cat.occupation
} else {
cats << cat.name
}
}
}
}
} catch(e) {
cats << "Other Area(s)"
}
cats
}
static mapping = {
table 'dbo.JOBORDER'
version false
id generator: 'identity', column: 'JOBORDERID'
/*
* several other mapped columns deleted here
*/
categories joinTable:[name:'jobOrderCategories', column: 'categoryId', key:'jobOrderID']
}
/*
* several properties deleted here
*/
static hasMany = [categories: Category] //several other hasMany associations exist
}
Category Object:
class Category {
static mapping = {
table 'CATEGORY'
version false
id generator: 'identity', column: 'categoryID'
occupation column: 'OCCUPATION'
name column: 'NAME'
parentCategoryID column: 'PARENTCATEGORYID'
/*
* several other mapped columns deleted here
*/
jobOrders joinTable:[name:'jobOrderCategories', column: 'jobOrderID', key:'categoryId']
}
String name
String occupation
int parentCategoryID
/*
* several properties deleted here
*/
static belongsTo = [JobOrder]
static hasMany = [jobOrders:JobOrder]
}
Join Table:
class JobOrderCategories {
static mapping = {
table 'JOBORDERCATEGORIES'
version false
isDeleted column: 'ISDELETED'
jobOrderID column: 'JOBORDERID'
categoryId column: 'CATEGORYID'
}
Boolean isDeleted
Integer jobOrderID
Integer categoryId
}
These kinds of situations aren't the most fun, but I have had to deal with this kind of Roll-Your-Own ORM problems before ;) Basically what you're going to want to do here is store the object properties not typed as Object references, but as ints, and while you'll lose some of the dynamic finder things GORM makes so nifty, you'll have a fairly straight-forward means of accessing the data that doesn't involve tangling yourself up with Hibernate's innards.
Basically, this will involve ditching your hasMany and belongsTo properties on JobOrder and Category. Instead, you'll want to do things like
def myJobOrder = JobOrder.get(yourId);
def myCategoryIds = JobOrderCategories.findAllByJobOrderID(myJobOrder.id)
def myCategories = Categories.withCriteria {
in('id', myCategoryIds)
}
You can put variations of those traversals in helper methods on your classes, like for example, your getJobCategories method could become
class JobOrder {
//...
def getJobCategories() {
def myCategoryIds = JobOrderCategories.findAllByJobOrderID(this.id)
def myCategories = Categories.withCriteria {
in('id', myCategoryIds)
}
}
}
And so on. This is definitely not the prettiest thing in the world to deal with, and you lose your ability to traverse through things easily with GORM (ex a
jobOrder.withCriteria {
categories {
eq('name', blah)
}
}
becomes a executeQuery type of situation.)
But overall, its not too bad to deal with :)
Hope that helps!
Hello I have the follwing domain classes.
class Student {
int age
static hasMany = [courses:Course]
}
class Course {
String name
static hasMany = [students:Student]
}
I want to find the Students taking Course (with id 1), with age 7.
Could I do that with dynamic finder or criteria builder or HQL?
I do not want to do following as it load all students so inefficient:
def course = Course.get(1);
course.students.findAll{ it.age == 7 }
def studs = Student.withCriteria {
eq('age', 7)
courses {
eq('id', 1)
}
}
It's in GORM doc, section "Criteria/Querying Associations".
You can use a dynamic finder:
def students = Student.findByCourseAndAge(Course.load(1), 7)
By using load() instead of get() you avoid retrieving the whole Course instance and just reference its id.
Another option is HQL:
def students = Student.executeQuery(
'from Student s where s.course.id = :courseId and s.age = :age',
[courseId: 1, age: 7])
I'm trying for several days to receive a list from my Data. The Domain looks like this:
class Alpha {
String a
String b
etc.
static hasMany = [beta:Beta]
}
class Beta {
String a
Integer foo
String status
static belongsTo = [alpha:Alpha]
static constraints = {
status(nullable:false, inList:["val1","val2","val3", "val4"])
}
}
I'd like to have in Alpha the sum of all Beta.foo and of all Beta.foo in a certain status. Best would be something like an additional row ( Integer sumVal1 ... ).
I tried named queries:
static namedQueries = {
erledigterProbeAufwend {
createAlias ('Beta', 'b')
eq ('b.status', 'val1')
projections {
groupProperty('b.alpha')
sum('b.foo', 'sumFooVal1')
}
}
}
But this just give me one sum at a time.
I'm looking forward to get some help on that.
Greetings
Bas
This could be calculated formula field, but with a subquery trick:
static mapping = {
betaCount formula: "(SELECT count(*) FROM Beta b WHERE b.alpha_id = id and b.status in('a', 'b'))"
}
Create transient variables in your Alpha class and populate them in an onLoad event.
class Alpha {
String a
String b
etc.
static transients = ["sumVal1",...]
static hasMany = [beta:Beta]
def onLoad = {
sumVal1 = ....
}
}
Grails 1.1.1
Goovy 1.5.7
In a relationship such this:
Author 1 -- n Book n -- 1 Publisher
Defined in Grails:
class Author {
String firstName
String lastName
static hasMany = [books: Book]
static constraints = {
books(nullable: true)
}
}
class Book {
String title
Author author
Publisher publisher
static constraints = {
author(nullable: true)
publisher(nullable: true)
}
}
class Publisher {
String name
static hasMany = [books: Book]
static constraints = {
books(nullable: true)
}
}
I want to load a Book with the values of Publisher and Author.
When i get a Book with the query:
def book2 = Book.findAllByAuthor(author)
I get the response with the autor assosiated but the publisher only have the id and name class in the other query:
def book3 = Book.findAllByPublisher(publisher)
I retrieve me the inverse result,i have the book with the publisher data but the author only have the id and the class name.
Where is the error in the defined model ? o there is an error in the way to do the queries ?
Edit:
I need the way to retrieve the values only with the query like this:
def book2 = Book.findAllByAuthor(author, [fetch:[publisher:'eager']])
In this one I can manage the value of publisher.
Question: If publisher had a hasmany or Domain related, getting the book I'm able to read the attributes?
Thanks.
Thanks.
Lazy fetching is used by default with gorm associations. If you want to enable eager fetching, you can modify the ORM DSL by adding the following mappings block to your Author domain class:
static mapping = {
books lazy:false
}
or you could change the fetch mode in the domain object by adding following code after your books relationship is defined.
static fetchMode = [books:"eager"]
Doing the same to your Publisher domain object should allow you to accomplish what you want. You do want to be careful of the consequence that you may load more data than you intend to.
Shouldn't the get() method return what you are looking for?
Example: def book2 = Book.get(author)
You'd better use Criteria and explicitly define which relations should be loaded eagerly. Just mention relation in the query.
Example:
def c = Teacher.createCriteria()
List<Teacher> results = c.list {
subjects {
attendees {}
}
}