[Lift] Re: Box and bind
There should be implicits that allow you to bind to a Box of a NodeSeq, so you can bind to prodBox.map(_.toForm). Otherwise bind to prodBox.map(_.toForm).openOr(NodeSeq.Empty) etc. - José Maríajosemariar...@gmail.com wrote: Hi. Boxes are giving me a hard time. Say you have a model of a Product. If I've a snippet that retrieves a Product from the DB: val product : Box[Product] = Product.find(2) And now I want to bind product with bind(), product is a Box and it can be empty, how can I bind something that doesn't exists? You have to return a NodeSeq in a snippet. What should my code must do? Best regards. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Box and bind
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String,scala.xml.NodeSeq,java.lang.String,java.lang.String,net.liftweb.util.Helpers.BindParam,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
Because the compiler interpret your expression as you expect. Instead
of:
url_enlace - (/product/ + product.id.toString)
which is what you wanted, it got:
(url_enlace - /product/) + product.id.toString)
which it can do because it can take an arbitrary object:
(url_enlace - /product/): ABindParam
or (the other implicit -)
(url_enlace - /product/): Tuple2[String, String]
and convert them to strings. Of course, once it converts to string, it
won't fit in bind()'s argument list and so it gave you the could not
find overload error.
Honestly I'm a bit fuzzy on Scala's operator precedence behavior, I
think if I recall you can't set precedence, it comes pre-set on all
the standard operators like + / -, etc.
-Ross
On Sep 8, 2009, at 3:42 PM, José María wrote:
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else
(and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box
[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your
snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do
with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You
have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
Operators starting with - and + have the same precendence so they are combined
left to right. Thus you are concatenating a BindParam with a String, returning
a String.
-
José Maríajosemariar...@gmail.com wrote:
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else (and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
Precedence is determined by the first character of an operator.
-
Ross Mellgrendri...@gmail.com wrote:
Because the compiler interpret your expression as you expect. Instead
of:
url_enlace - (/product/ + product.id.toString)
which is what you wanted, it got:
(url_enlace - /product/) + product.id.toString)
which it can do because it can take an arbitrary object:
(url_enlace - /product/): ABindParam
or (the other implicit -)
(url_enlace - /product/): Tuple2[String, String]
and convert them to strings. Of course, once it converts to string, it
won't fit in bind()'s argument list and so it gave you the could not
find overload error.
Honestly I'm a bit fuzzy on Scala's operator precedence behavior, I
think if I recall you can't set precedence, it comes pre-set on all
the standard operators like + / -, etc.
-Ross
On Sep 8, 2009, at 3:42 PM, José María wrote:
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else
(and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box
[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your
snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do
with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You
have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
Yup
-
José Maríajosemariar...@gmail.com wrote:
OMG
So, as - begins with - then it has the precedence of the operator
-
On Sep 8, 7:52 pm, Naftoli Gugenheim naftoli...@gmail.com wrote:
Precedence is determined by the first character of an operator.
-
Ross Mellgrendri...@gmail.com wrote:
Because the compiler interpret your expression as you expect. Instead
of:
url_enlace - (/product/ + product.id.toString)
which is what you wanted, it got:
(url_enlace - /product/) + product.id.toString)
which it can do because it can take an arbitrary object:
(url_enlace - /product/): ABindParam
or (the other implicit -)
(url_enlace - /product/): Tuple2[String, String]
and convert them to strings. Of course, once it converts to string, it
won't fit in bind()'s argument list and so it gave you the could not
find overload error.
Honestly I'm a bit fuzzy on Scala's operator precedence behavior, I
think if I recall you can't set precedence, it comes pre-set on all
the standard operators like + / -, etc.
-Ross
On Sep 8, 2009, at 3:42 PM, José María wrote:
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else
(and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box
[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your
snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do
with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You
have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else (and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
I adapted the code but not the error, Producto is Product in Spanish.
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else (and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
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[Lift] Re: Box and bind
OMG
So, as - begins with - then it has the precedence of the operator
-
On Sep 8, 7:52 pm, Naftoli Gugenheim naftoli...@gmail.com wrote:
Precedence is determined by the first character of an operator.
-
Ross Mellgrendri...@gmail.com wrote:
Because the compiler interpret your expression as you expect. Instead
of:
url_enlace - (/product/ + product.id.toString)
which is what you wanted, it got:
(url_enlace - /product/) + product.id.toString)
which it can do because it can take an arbitrary object:
(url_enlace - /product/): ABindParam
or (the other implicit -)
(url_enlace - /product/): Tuple2[String, String]
and convert them to strings. Of course, once it converts to string, it
won't fit in bind()'s argument list and so it gave you the could not
find overload error.
Honestly I'm a bit fuzzy on Scala's operator precedence behavior, I
think if I recall you can't set precedence, it comes pre-set on all
the standard operators like + / -, etc.
-Ross
On Sep 8, 2009, at 3:42 PM, José María wrote:
It worked when I put the () around the bind param
and the question is ... why?
On Sep 8, 7:35 pm, Ross Mellgren dri...@gmail.com wrote:
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else
(and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box
[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your
snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do
with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You
have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: Box and bind
So that doesn't seem to be a box-related thing so much as a bind
argument related thing, probably because you have a precedence
problem... try:
producto.map(product =
bind(product, xhtml,
url_enlace - (/product/ + product.id.toString),
)
).openOr(NodeSeq.Empty)
Also, FYI, you have val product = Product.find(id), but then map over
producto. I presume either producto is coming from somewhere else (and
val product is being shadowed inside the map) or that you pasted not
exactly what you're compiling.
-Ross
On Sep 8, 2009, at 3:25 PM, José María wrote:
That's my code:
val product = Product.find(id)
producto.map(product =
bind(product, xhtml,
url_enlace -- /product/ + product.id.toString ,
)
).openOr(NodeSeq.Empty)
}
and I get this error:
[INFO] use java command with args in file forced : false
/usr/home/josemaria/src/lift/helloworld/src/main/scala/demo/
helloworld/
snippet/Portada.scala:55: error: overloaded method value bind with
alternatives (String,net.liftweb.util.Box[(scala.xml.NodeSeq) =
scala.xml.NodeSeq],net.liftweb.util.Box[(scala.xml.PrefixedAttribute)
=
scala.xml.MetaData
],scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq and
(String,scala.xml.NodeSeq,net.liftweb.util.Helpers.BindParam*)
scala.xml.NodeSeq cannot be applied to
(java.lang.String
,scala.xml.NodeSeq
,java.lang.String
,java.lang.String
,net.liftweb.util.Helpers.BindParam
,net.liftweb.util.Helpers.BindParam)
bind(producto, xhtml,
^
one error found
What's wrong?
On Sep 8, 7:13 pm, Ross Mellgren dri...@gmail.com wrote:
Well it depends on precisely what you want. If you want your snippet
to become empty if the product is not there, try:
productBox.map(product = {
bind(product, ns, ...)
}).openOr(NodeSeq.Empty)
If you want only certain bind positions empty, do the same thing
inside the bind:
bind(proudct, ns,
field - productBox.map(p = Text(p.field.toString)).openOr
(NodeSeq.Empty),
...)
map is of course just one of the (simpler) operations you can do with
a Box, there's more complicated stuff if you need other variants.
-Ross
On Sep 8, 2009, at 3:06 PM, José María wrote:
Hi.
Boxes are giving me a hard time.
Say you have a model of a Product.
If I've a snippet that retrieves a Product from the DB:
val product : Box[Product] = Product.find(2)
And now I want to bind product with bind(), product is a Box
and it
can be empty, how can I bind something that doesn't exists? You have
to return a NodeSeq in a snippet. What should my code must do?
Best regards.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
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