How to bind data to a command object that has an non domain object as property?

[marcopas]

Hi there,

I am trying to bind some data to an object that is part of a command
object. The object stays null when trying to use it.
Probably i am not giving the correct data in the gsp but i have no
clue what am i doing wrong!

// the form that submits the data
<g:form>
    <g:textField name="book.title" value="Lord Of the Rings"/><br>
    <br><br>
    <g:actionSubmit action="create" value="Create!"/>
</g:form>

// controller code
def create = { BooksBindingCommand cmd ->
    println cmd?.book?.title // the book property always stays null
    redirect(action: "index")
}

// command object
class BooksBindingCommand {
    Book book
}

// the book class !!! Is no domain class !!!
class Book {
    String title
}

Any suggestion on why the binding of 'book.title' fails?

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[Jonathan Rosenberg]

How about doing a dump() on cmd after the binding to see what's there.

On Nov 9, 2011 5:01 PM, "Marco Pas" <[hidden email]> wrote:

Hi there,

I am trying to bind some data to an object that is part of a command
object. The object stays null when trying to use it.
Probably i am not giving the correct data in the gsp but i have no
clue what am i doing wrong!

// the form that submits the data
<g:form>
   <g:textField name="book.title" value="Lord Of the Rings"/><br>
   <br><br>
   <g:actionSubmit action="create" value="Create!"/>
</g:form>

// controller code
def create = { BooksBindingCommand cmd ->
   println cmd?.book?.title // the book property always stays null
   redirect(action: "index")
}

// command object
class BooksBindingCommand {
   Book book
}

// the book class !!! Is no domain class !!!
class Book {
   String title
}

Any suggestion on why the binding of 'book.title' fails?

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[marcopas]

The command object is not bound at all, when i use normal properties
all seems ok, so binding works
but when i try to bind a nested object instead of property it fails..
and the cmd is null

i am trying to bind book.title to a object Book in the Command Object
which has a property title.

2011/11/10 Jonathan Rosenberg <[hidden email]>:

> How about doing a dump() on cmd after the binding to see what's there.
>
> On Nov 9, 2011 5:01 PM, "Marco Pas" <[hidden email]> wrote:
>>
>> Hi there,
>>
>> I am trying to bind some data to an object that is part of a command
>> object. The object stays null when trying to use it.
>> Probably i am not giving the correct data in the gsp but i have no
>> clue what am i doing wrong!
>>
>> // the form that submits the data
>> <g:form>
>>    <g:textField name="book.title" value="Lord Of the Rings"/><br>
>>    <br><br>
>>    <g:actionSubmit action="create" value="Create!"/>
>> </g:form>
>>
>> // controller code
>> def create = { BooksBindingCommand cmd ->
>>    println cmd?.book?.title // the book property always stays null
>>    redirect(action: "index")
>> }
>>
>> // command object
>> class BooksBindingCommand {
>>    Book book
>> }
>>
>> // the book class !!! Is no domain class !!!
>> class Book {
>>    String title
>> }
>>
>> Any suggestion on why the binding of 'book.title' fails?
>>
>> ---------------------------------------------------------------------
>> To unsubscribe from this list, please visit:
>>
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>>
>>
>

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[Jonathan Rosenberg]

How are you checking the value of the command object?  Logging?

--
Jonathan Rosenberg
Founder & Executive Director
Tabby's Place, a Cat Sanctuary
http://www.tabbysplace.org/


On Thu, Nov 10, 2011 at 11:54 AM, Marco Pas <[hidden email]> wrote:

> The command object is not bound at all, when i use normal properties
> all seems ok, so binding works
> but when i try to bind a nested object instead of property it fails..
> and the cmd is null
>
> i am trying to bind book.title to a object Book in the Command Object
> which has a property title.
>
> 2011/11/10 Jonathan Rosenberg <[hidden email]>:
>> How about doing a dump() on cmd after the binding to see what's there.
>>
>> On Nov 9, 2011 5:01 PM, "Marco Pas" <[hidden email]> wrote:
>>>
>>> Hi there,
>>>
>>> I am trying to bind some data to an object that is part of a command
>>> object. The object stays null when trying to use it.
>>> Probably i am not giving the correct data in the gsp but i have no
>>> clue what am i doing wrong!
>>>
>>> // the form that submits the data
>>> <g:form>
>>>    <g:textField name="book.title" value="Lord Of the Rings"/><br>
>>>    <br><br>
>>>    <g:actionSubmit action="create" value="Create!"/>
>>> </g:form>
>>>
>>> // controller code
>>> def create = { BooksBindingCommand cmd ->
>>>    println cmd?.book?.title // the book property always stays null
>>>    redirect(action: "index")
>>> }
>>>
>>> // command object
>>> class BooksBindingCommand {
>>>    Book book
>>> }
>>>
>>> // the book class !!! Is no domain class !!!
>>> class Book {
>>>    String title
>>> }
>>>
>>> Any suggestion on why the binding of 'book.title' fails?
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
>>>    http://xircles.codehaus.org/manage_email
>>>
>>>
>>
>
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[eduardoarantes]

did you get this working?
I'm facing the same issue

[marcopas]

Sadly not.. i could not get it working. I am still very curious why
this does not work.

It seems so simple, but my guess is that because the book object is
not a real domain object the Spring databinding does not pick this up
somehow..
If someone else has a better explained i would like to learn from it!

/Marco

2012/1/25 eduardoarantes <[hidden email]>:

> did you get this working?
> I'm facing the same issue
>
> --
> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
> Sent from the Grails - user mailing list archive at Nabble.com.
>
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[eduardoarantes]

I can't bind date also

marcopas wrote

Sadly not.. i could not get it working. I am still very curious why
this does not work.

It seems so simple, but my guess is that because the book object is
not a real domain object the Spring databinding does not pick this up
somehow..
If someone else has a better explained i would like to learn from it!

/Marco

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[Vithun Kumar]

Have you tried initially instantiating the object in the command object, like so:

class BooksBindingCommand {
   Book book = new Book()
}

Vithun

On 25 Jan 2012, at 21:58, Marco Pas wrote:

> Sadly not.. i could not get it working. I am still very curious why
> this does not work.
>
> It seems so simple, but my guess is that because the book object is
> not a real domain object the Spring databinding does not pick this up
> somehow..
> If someone else has a better explained i would like to learn from it!
>
> /Marco
>
> 2012/1/25 eduardoarantes <[hidden email]>:
>> did you get this working?
>> I'm facing the same issue
>>
>> --
>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>> Sent from the Grails - user mailing list archive at Nabble.com.
>>
>> ---------------------------------------------------------------------
>> To unsubscribe from this list, please visit:
>>
>>    http://xircles.codehaus.org/manage_email
>>
>>
>
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[seeker136]

Yep, I ran into the same problem today. Do we need a custom property
editor for this scenario?

http://omaha-seattle.blogspot.com/2010/02/custom-grails-property-editor.html

Jay

On Wed, Jan 25, 2012 at 5:17 PM, Vithun Kumar <[hidden email]> wrote:

> Have you tried initially instantiating the object in the command object, like so:
>
> class BooksBindingCommand {
>   Book book = new Book()
> }
>
> Vithun
>
> On 25 Jan 2012, at 21:58, Marco Pas wrote:
>
>> Sadly not.. i could not get it working. I am still very curious why
>> this does not work.
>>
>> It seems so simple, but my guess is that because the book object is
>> not a real domain object the Spring databinding does not pick this up
>> somehow..
>> If someone else has a better explained i would like to learn from it!
>>
>> /Marco
>>
>> 2012/1/25 eduardoarantes <[hidden email]>:
>>> did you get this working?
>>> I'm facing the same issue
>>>
>>> --
>>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>>> Sent from the Grails - user mailing list archive at Nabble.com.
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
>>>    http://xircles.codehaus.org/manage_email
>>>
>>>
>>
>> ---------------------------------------------------------------------
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>>
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>>
>>
>
>
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[marcopas]

I checked the tip from Vithun Kumar and it did the trick.. now when i
initialize the object in the Command Object it works as i would
expect!

So when using:
    // command object
    class BooksBindingCommand {
        Book book = new Book()
    }

It works as expected! I am still wondering why i need to initialize the object?

/Marco

2012/1/26 Jay Hogan <[hidden email]>:

> Yep, I ran into the same problem today. Do we need a custom property
> editor for this scenario?
>
> http://omaha-seattle.blogspot.com/2010/02/custom-grails-property-editor.html
>
> Jay
>
> On Wed, Jan 25, 2012 at 5:17 PM, Vithun Kumar <[hidden email]> wrote:
>> Have you tried initially instantiating the object in the command object, like so:
>>
>> class BooksBindingCommand {
>>   Book book = new Book()
>> }
>>
>> Vithun
>>
>> On 25 Jan 2012, at 21:58, Marco Pas wrote:
>>
>>> Sadly not.. i could not get it working. I am still very curious why
>>> this does not work.
>>>
>>> It seems so simple, but my guess is that because the book object is
>>> not a real domain object the Spring databinding does not pick this up
>>> somehow..
>>> If someone else has a better explained i would like to learn from it!
>>>
>>> /Marco
>>>
>>> 2012/1/25 eduardoarantes <[hidden email]>:
>>>> did you get this working?
>>>> I'm facing the same issue
>>>>
>>>> --
>>>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>>>> Sent from the Grails - user mailing list archive at Nabble.com.
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe from this list, please visit:
>>>>
>>>>    http://xircles.codehaus.org/manage_email
>>>>
>>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
>>>    http://xircles.codehaus.org/manage_email
>>>
>>>
>>
>>
>> ---------------------------------------------------------------------
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>
>
>
> --
> ==============================
> Converting caffeine into code since 1998.
>
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[marcopas]

When using a domain / model object as a property for the form, i do
not need to initialize the object myself and the framework does that
for me.

So when having a domain object as property i can do this:

    // command object
    class BooksBindingCommand {
        Book book // Book is model object
    }

and when using a non domain / model object i need to initialize the object.

    // command object
    class BooksBindingCommand {
        Book book = new Book() // Book is a normal object (src/groovy)
    }

The nested properties now work in both cases.

/Marco

2012/1/26 Marco Pas <[hidden email]>:

> I checked the tip from Vithun Kumar and it did the trick.. now when i
> initialize the object in the Command Object it works as i would
> expect!
>
> So when using:
>    // command object
>    class BooksBindingCommand {
>        Book book = new Book()
>    }
>
> It works as expected! I am still wondering why i need to initialize the object?
>
> /Marco
>
> 2012/1/26 Jay Hogan <[hidden email]>:
>> Yep, I ran into the same problem today. Do we need a custom property
>> editor for this scenario?
>>
>> http://omaha-seattle.blogspot.com/2010/02/custom-grails-property-editor.html
>>
>> Jay
>>
>> On Wed, Jan 25, 2012 at 5:17 PM, Vithun Kumar <[hidden email]> wrote:
>>> Have you tried initially instantiating the object in the command object, like so:
>>>
>>> class BooksBindingCommand {
>>>   Book book = new Book()
>>> }
>>>
>>> Vithun
>>>
>>> On 25 Jan 2012, at 21:58, Marco Pas wrote:
>>>
>>>> Sadly not.. i could not get it working. I am still very curious why
>>>> this does not work.
>>>>
>>>> It seems so simple, but my guess is that because the book object is
>>>> not a real domain object the Spring databinding does not pick this up
>>>> somehow..
>>>> If someone else has a better explained i would like to learn from it!
>>>>
>>>> /Marco
>>>>
>>>> 2012/1/25 eduardoarantes <[hidden email]>:
>>>>> did you get this working?
>>>>> I'm facing the same issue
>>>>>
>>>>> --
>>>>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>>>>> Sent from the Grails - user mailing list archive at Nabble.com.
>>>>>
>>>>> ---------------------------------------------------------------------
>>>>> To unsubscribe from this list, please visit:
>>>>>
>>>>>    http://xircles.codehaus.org/manage_email
>>>>>
>>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe from this list, please visit:
>>>>
>>>>    http://xircles.codehaus.org/manage_email
>>>>
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
>>>    http://xircles.codehaus.org/manage_email
>>>
>>>
>>
>>
>>
>> --
>> ==============================
>> Converting caffeine into code since 1998.
>>
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>>
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[eduardoarantes]

Hi!!

Great! It really works.

I haven't found anything on the documentation though.

I'd like to read something regarding this in GRails doc if someone knows where it is

marcopas wrote

When using a domain / model object as a property for the form, i do
not need to initialize the object myself and the framework does that
for me.

So when having a domain object as property i can do this:

    // command object
    class BooksBindingCommand {
        Book book // Book is model object
    }

and when using a non domain / model object i need to initialize the object.

    // command object
    class BooksBindingCommand {
        Book book = new Book() // Book is a normal object (src/groovy)
    }

The nested properties now work in both cases.

/Marco

2012/1/26 Marco Pas <[hidden email]>:
> I checked the tip from Vithun Kumar and it did the trick.. now when i
> initialize the object in the Command Object it works as i would
> expect!
>
> So when using:
>    // command object
>    class BooksBindingCommand {
>        Book book = new Book()
>    }
>
> It works as expected! I am still wondering why i need to initialize the object?
>
> /Marco
>
> 2012/1/26 Jay Hogan <[hidden email]>:
>> Yep, I ran into the same problem today. Do we need a custom property
>> editor for this scenario?
>>
>> http://omaha-seattle.blogspot.com/2010/02/custom-grails-property-editor.html
>>
>> Jay
>>
>> On Wed, Jan 25, 2012 at 5:17 PM, Vithun Kumar <[hidden email]> wrote:
>>> Have you tried initially instantiating the object in the command object, like so:
>>>
>>> class BooksBindingCommand {
>>>   Book book = new Book()
>>> }
>>>
>>> Vithun
>>>
>>> On 25 Jan 2012, at 21:58, Marco Pas wrote:
>>>
>>>> Sadly not.. i could not get it working. I am still very curious why
>>>> this does not work.
>>>>
>>>> It seems so simple, but my guess is that because the book object is
>>>> not a real domain object the Spring databinding does not pick this up
>>>> somehow..
>>>> If someone else has a better explained i would like to learn from it!
>>>>
>>>> /Marco
>>>>
>>>> 2012/1/25 eduardoarantes <[hidden email]>:
>>>>> did you get this working?
>>>>> I'm facing the same issue
>>>>>
>>>>> --
>>>>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>>>>> Sent from the Grails - user mailing list archive at Nabble.com.
>>>>>
>>>>> ---------------------------------------------------------------------
>>>>> To unsubscribe from this list, please visit:
>>>>>
>>>>>    http://xircles.codehaus.org/manage_email
>>>>>
>>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe from this list, please visit:
>>>>
>>>>    http://xircles.codehaus.org/manage_email
>>>>
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
>>>    http://xircles.codehaus.org/manage_email
>>>
>>>
>>
>>
>>
>> --
>> ==============================
>> Converting caffeine into code since 1998.
>>
>> ---------------------------------------------------------------------
>> To unsubscribe from this list, please visit:
>>
>>    http://xircles.codehaus.org/manage_email
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[eduardoarantes]

This solution has a drawback.

Simple validation like

static constraints = {
                provider blank: false
                startDate blank: false
                endDate blank: false
        }

Doesn't  seem to work because the values won't be blank ever.

Any thoughs?

marcopas wrote

When using a domain / model object as a property for the form, i do
not need to initialize the object myself and the framework does that
for me.

So when having a domain object as property i can do this:

    // command object
    class BooksBindingCommand {
        Book book // Book is model object
    }

and when using a non domain / model object i need to initialize the object.

    // command object
    class BooksBindingCommand {
        Book book = new Book() // Book is a normal object (src/groovy)
    }

The nested properties now work in both cases.

/Marco

2012/1/26 Marco Pas <[hidden email]>:
> I checked the tip from Vithun Kumar and it did the trick.. now when i
> initialize the object in the Command Object it works as i would
> expect!
>
> So when using:
>    // command object
>    class BooksBindingCommand {
>        Book book = new Book()
>    }
>
> It works as expected! I am still wondering why i need to initialize the object?
>
> /Marco
>
> 2012/1/26 Jay Hogan <[hidden email]>:
>> Yep, I ran into the same problem today. Do we need a custom property
>> editor for this scenario?
>>
>> http://omaha-seattle.blogspot.com/2010/02/custom-grails-property-editor.html
>>
>> Jay
>>
>> On Wed, Jan 25, 2012 at 5:17 PM, Vithun Kumar <[hidden email]> wrote:
>>> Have you tried initially instantiating the object in the command object, like so:
>>>
>>> class BooksBindingCommand {
>>>   Book book = new Book()
>>> }
>>>
>>> Vithun
>>>
>>> On 25 Jan 2012, at 21:58, Marco Pas wrote:
>>>
>>>> Sadly not.. i could not get it working. I am still very curious why
>>>> this does not work.
>>>>
>>>> It seems so simple, but my guess is that because the book object is
>>>> not a real domain object the Spring databinding does not pick this up
>>>> somehow..
>>>> If someone else has a better explained i would like to learn from it!
>>>>
>>>> /Marco
>>>>
>>>> 2012/1/25 eduardoarantes <[hidden email]>:
>>>>> did you get this working?
>>>>> I'm facing the same issue
>>>>>
>>>>> --
>>>>> View this message in context: http://grails.1312388.n4.nabble.com/How-to-bind-data-to-a-command-object-that-has-an-non-domain-object-as-property-tp4021559p4328613.html
>>>>> Sent from the Grails - user mailing list archive at Nabble.com.
>>>>>
>>>>> ---------------------------------------------------------------------
>>>>> To unsubscribe from this list, please visit:
>>>>>
>>>>>    http://xircles.codehaus.org/manage_email
>>>>>
>>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe from this list, please visit:
>>>>
>>>>    http://xircles.codehaus.org/manage_email
>>>>
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe from this list, please visit:
>>>
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>>>
>>
>>
>>
>> --
>> ==============================
>> Converting caffeine into code since 1998.
>>
>> ---------------------------------------------------------------------
>> To unsubscribe from this list, please visit:
>>
>>    http://xircles.codehaus.org/manage_email
>>
>>

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