Referencing Hash Values from Keys
"Shelley, Ryan" <[email protected]> Tue, 27 Oct 2009 04:45:11 +0000
| Newsgroups | gmane.comp.text.fmpp |
|---|---|
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I'm new to Freemarker, but have used other templating languages in the
past. Currently, I'm attempting to use FMPP to generate configuration
files, but having a bit of difficulty referencing hash values from keys.
Here is my TDD and sample template:
=20
TDD:
=20
{
pools: [
{
poolName: Foo
poolConnections: ServiceA
},
{
poolName: Bar
poolConnections: ServiceB
}
]
}
=20
Template:
=20
This will output fine:
<#list pools as pool>
<#assign keys =3D pool?keys >
<#list keys as key>
${key} =3D ${pool[key]}
</#list>
</#list>
=20
This will get an error on poolConnections:
<#list pools as pool>
${pool.poolName}
${pool.poolConnections}
</#list>
=20
In the first list iteration, everything is output correctly, but I have
no control over the keys. However, the second iteration fails on
"${pool.poolConnections}" with the error:
=20
Caused by: freemarker.core.InvalidReferenceException: Expression
pool.poolConnections is undefined (notice the error is not on
pool.poolName)
=20
If I take "${pool.poolConnections}" out, it works fine (I see the value
for poolName), but I kind of need to be able to access
"poolConnections"!
=20
I've tried this with different combinations of
"${pool[poolConnections]}" and "${pool['poolConnections']}" and
"${pool.get(poolConnections)}" but none seem to be correct. I've been
back and forth through the documentation and the examples, but none seem
to cover accessing a hash value by it's key directly.
=20
Suggestions? Thanks!
=20
-Ryan
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<div class=3DSection1>
<p class=3DMsoNormal>I’m new to Freemarker, but have used other =
templating
languages in the past. Currently, I’m attempting to use FMPP =
to
generate configuration files, but having a bit of difficulty referencing =
hash values
from keys. Here is my TDD and sample template:<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>TDD:<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New"'> <span
style=3D'color:black'>pools</span>: [<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> =
{<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> &=
nbsp; poolName:
Foo<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> &=
nbsp; poolConnections:
ServiceA<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> =
},<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> =
{<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> &=
nbsp; poolName:
Bar<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> &=
nbsp; poolConnections:
ServiceB<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New"'> =
}<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New"'> =
]<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'>}<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Template:<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'><o:p> </o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'>This will output =
fine:<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'><</span><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:#3F7F5F'>#list pools as =
pool></span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'> =
<</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#3F7F5F'>#assign keys =3D
pool?keys ></span><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'> =
<</span><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:#3F7F5F'>#list =
keys as
key></span><span style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier =
New";color:black'> &=
nbsp; ${key}
=3D </span><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#2A00FF'>${pool[key]}</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'> =
</</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#3F7F5F'>#list></span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'></</span><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>#list><o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>This will get an error on poolConnections:</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#3F7F5F'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'><</span><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:#3F7F5F'>#list pools as =
pool></span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'> =
${pool.poolName}</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:black'> =
${pool.poolConnections}</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'></</span><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>#list><o:p></o:p></span></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>In the first list iteration, everything is output =
correctly,
but I have no control over the keys. However, the second iteration =
fails
on “${pool.poolConnections}” with the error:<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>Caused by: =
freemarker.core.InvalidReferenceException:
Expression pool.poolConnections is undefined (notice the error is not on
pool.poolName)<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>If I take “${pool.poolConnections}” =
out, it
works fine (I see the value for poolName), but I kind of need to be able =
to access
“poolConnections”!<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>I’ve tried this with different combinations =
of “${pool[poolConnections]}”
and “${pool[‘poolConnections’]}” and =
“${pool.get(poolConnections)}”
but none seem to be correct. I’ve been back and forth =
through the
documentation and the examples, but none seem to cover accessing a hash =
value
by it’s key directly.<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>Suggestions? Thanks!<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>-Ryan<o:p></o:p></p>
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