data binding in grails

Data Bindingin Grails

Agenda

1. What is data binding?

2. What are the possible scenarios?

3. What options does Grails provides for data binding?

4. Security concerns

Introduction to AWS CodeDeploy

• Single domain class form• Multiple instances of a domain

class• Associations• A domain object with file

Single Domain Class

def save = {def b = new Book()b.properties = paramsb.save()

}

Single Domain Class

def save = {def b = new Book(params) b.save()

}

def update = {def b = Book.get(params.id) b.properties = paramsb.save()

}

BindData examples

// request parameters to a target objectbindData(target, this.params)

// exclude firstName and lastNamebindData(target, this.params,['firstName', 'lastName'])

// only use parameters starting with "author." e.g. author.emailbindData(target, this.params, "author")

BindData examples

// exclude firstName and lastName and only useparameters starting with "author." e.g. author.emailbindData(target, this.params, ['firstName', 'lastName'], "author")

Binding with Associations

class SomeCO{Date startDate; Date endDate;Project project

}<g:datePicker name="startDate"/><g:datePicker name="startDate"/><g:select name="project.id" from="${someList}" value="${project?.name}" optionKey="id"/>

def myAction{SomeCOsomeCO ->// perform action}

Binding with Associations

class Book{String name Author author

}

<input type="text" name="book.name"<input type="text" name="author.name"

class Author{String name

}

def b = new Book(params['book'])def a = new Author(params['author'])

Binding with Associations

<g:form action=”save”>Title:<input type=”text” name=”album.title” /> <br>Artist:<input type=”text” name=”artist.name” /><br>Song 1:<input type=”text” name=”songs[0].name”/><br> Song 2:<input type=”text” name=”songs[1].name”/><br> Song 3:<input type=”text” name=”songs[3].name”/><br>

</g:form>

Addressing Security Concerns

Use Special Command Objects Use “excludes” parameter

References / Attribution

DGG – Second Edition – Chapter 4http://grails.org/Controllers+-+Data+Binding

License

This work is licensed under the Creative Commons Attribution-Non-commercial-Share Alike 3.0 License

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