Data Binding in Grails

Data Binding in Grails

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  Data Binding in Grails
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  Agenda 1. What isdata binding? 2. What arethe possible scenarios? 3. What options does Grails provides for data binding? 4. Security concerns
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  Introduction to AWSCodeDeploy • Single domain classform • Multiple instances of a domain class • Associations • A domain object with file
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  Single Domain Class defsave={ def b =new Book() b.properties =params b.save() }
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  Single Domain Class defsave={ def b =new Book(params) b.save() } def update ={ def b =Book.get(params.id) b.properties =params b.save() }
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  BindData examples // requestparameters to a target object bindData(target,this.params) // exclude firstName and lastName bindData(target,this.params,['firstName', 'lastName']) // only use parameters starting with"author." e.g. author.email bindData(target,this.params, "author")
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  BindData examples // excludefirstName and lastName and only use parameters starting with "author." e.g. author.email bindData(target,this.params,['firstName','lastName'], "author")
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  Binding with Associations classSomeCO{ 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{SomeCO someCO -> // perform action }
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  Binding with Associations classBook{ String name Author author } <input type="text" name="book.name" <input type="text" name="author.name" class Author{ Stringname } def b =new Book(params['book']) def a =new Author(params['author'])
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  Binding with Associations <g:formaction=”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>
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  Addressing Security Concerns UseSpecial Command Objects Use “excludes” parameter
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  References / Attribution DGG–Second Edition –Chapter4 http://grails.org/Controllers+-+Data+Binding
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  License Thiswork islicensed underthe Creative Commons Attribution-Non-commercial-Share Alike 3.0License
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