grails gotchas and best practices
TRANSCRIPT
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By Tom Henricksen
Agenda
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Domain-Driven Design
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Domain Validation
class User {
static
login
password
age
Conventions
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Dependency Injection
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Controllers
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Command Object
@grails.validation.Validateable
class LoginCommand {
String username
String password
static constraints = {
username(blank: false, minSize: 6)
password(blank: false, minSize: 6)
}
}
Services
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Domain
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Plugins
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Testing
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Discussion
Agenda
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Grails Gotchas
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Be Careful with GStrings
// Single quotes
def s1 = ‘This is a string’
// Double quotes
def s2 = “This is also a string!”
// A Gstring at a software conference…
def g1 = “Hi, your name is ${user.name}”
String toString() { return “$description” }
Grails Gotchas
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Mapping
static mapping = {
table ‘descriptions’ {
columns {
description column ‘description’
}
}
static mapping = {
table ‘descriptions’
}
GORM Gotchas
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Dynamic Finders
class Book {
String title
Date releaseDate
Author author
}
def book = Book.findByTitle("The Stand")
book = Book.findByTitleLike ("Harry Pot%")
GORM Gotchas
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// This is Helvetica: 18 pt or higher please
public class TransferServikjceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
Default Values
String description
static constraints = {
description nullable: false, maxSize: 500
}
Grails Gotchas
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