Re: [ansible-project] ternary clarification needed
Thank you all for the answers. I used the solution "from_yaml" provided by
Vladimir and it works like a charm, and it's also cleaner. However, if this
is the case, I don't believe this is an issue of how ternary works, but of
how "from_json" works. My gut feeling is that it shouldn't behave that way.
On Thu, Mar 26, 2020 at 9:27 AM Martin Krizek wrote:
> On Thu, Mar 26, 2020 at 7:55 AM Davide Scrimieri
> wrote:
> >
> > Hello,
> >
> > Whenever a ternary is used are both conditions evaluated regardless ?
> >
> > For example, I want to convert "my_other_var" to an object only if it is
> passed as as string, otherwise I don't want to touch the object, and leave
> it as it is.
> >
> > - set_fact:
> > my_var: "{{ ( my_other_var | type_debug == 'str' ) | ternary
> (my_other_var | from_json, my_other_var }}"
> >
>
> Yes, this is how the ternary filter works. To work around that you can
> use a ternary statement:
>
> - set_fact:
> my_var: "{{ my_other_var | from_json if (my_other_var |
> type_debug == 'str') else my_other_var }}"
>
> That should result in desired behavior.
>
> M.
>
> > What happens right now is this:
> >
> > if my_other_var is str -> It works
> > if my_other_var is dict -> it gives me the error saying that
> my_other_var should be a string to be converted from_json. But I would
> expect that being the condition on the left = False, it would ignore the
> left condition on the ternary and only consider the rightmost condition.
> >
> > I also tried using when:
> >
> > -- name: Set fact for string object
> > set_fact:
> > my_var: "{{ my_other_var | from_json }}"
> > when: (my_other_var | type_debug == 'str')
> >
> >
> > - name: Set fat for dict object
> > set_fact:
> > my_var: "{{ my_other_var | from_json }}"
> > when: (my_other_var | type_debug == 'dict')
> >
> > However, if "my_other_var" is dict, the first block (named set fact for
> string object) gives me the same error as before. I was actually expecting
> that being the when statement equals to false, it would simply ignore it.
> >
> >
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Re: [ansible-project] ternary clarification needed
On Thu, Mar 26, 2020 at 7:55 AM Davide Scrimieri wrote:
>
> Hello,
>
> Whenever a ternary is used are both conditions evaluated regardless ?
>
> For example, I want to convert "my_other_var" to an object only if it is
> passed as as string, otherwise I don't want to touch the object, and leave it
> as it is.
>
> - set_fact:
> my_var: "{{ ( my_other_var | type_debug == 'str' ) | ternary
> (my_other_var | from_json, my_other_var }}"
>
Yes, this is how the ternary filter works. To work around that you can
use a ternary statement:
- set_fact:
my_var: "{{ my_other_var | from_json if (my_other_var |
type_debug == 'str') else my_other_var }}"
That should result in desired behavior.
M.
> What happens right now is this:
>
> if my_other_var is str -> It works
> if my_other_var is dict -> it gives me the error saying that my_other_var
> should be a string to be converted from_json. But I would expect that being
> the condition on the left = False, it would ignore the left condition on the
> ternary and only consider the rightmost condition.
>
> I also tried using when:
>
> -- name: Set fact for string object
> set_fact:
> my_var: "{{ my_other_var | from_json }}"
> when: (my_other_var | type_debug == 'str')
>
>
> - name: Set fat for dict object
> set_fact:
> my_var: "{{ my_other_var | from_json }}"
> when: (my_other_var | type_debug == 'dict')
>
> However, if "my_other_var" is dict, the first block (named set fact for
> string object) gives me the same error as before. I was actually expecting
> that being the when statement equals to false, it would simply ignore it.
>
>
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Re: [ansible-project] ternary clarification needed
On Wed, 25 Mar 2020 23:54:57 -0700 (PDT)
Davide Scrimieri wrote:
> I want to convert "my_other_var" to an object only if it is
> passed as as string, otherwise I don't want to touch the object, and leave
> it as it is.
>
> - set_fact:
> my_var: "{{ ( my_other_var | type_debug == 'str' ) | ternary
> (my_other_var | from_json, my_other_var }}"
I'd rather use "from_yaml". JSON is a subset of YAML. How to test types see
https://jinja.palletsprojects.com/en/master/templates/#list-of-builtin-tests
For example
vars:
my_other_var1: "'my': {'other': {'var1': 'var1'}}"
my_other_var2:
my:
other:
var2: var2
tasks:
- debug:
msg: "{{ item is string|ternary(item|from_yaml, item) }}"
loop:
- "{{ my_other_var1 }}"
- "{{ my_other_var2 }}"
gives
ok: [localhost] => (item='my': {'other': {'var1': 'var1'}}) => {
"msg": {
"my": {
"other": {
"var1": "var1"
}
}
}
}
ok: [localhost] => (item={u'my': {u'other': {u'var2': u'var2'}}}) => {
"msg": {
"my": {
"other": {
"var2": "var2"
}
}
}
}
HTH,
-vlado
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