Yes, the mongodb lookup plugin is broken in ansible >= 2.4.1.0.

The problem is with this line 
<https://github.com/ansible/ansible/blob/4d67cdd1f73ced35dc63aa422a996b7496e0a710/lib/ansible/plugins/lookup/mongodb.py#L168>
:

def run(self, terms, variables, **kwargs):
ret = []
for term in terms:
When trying to run the example from the documentation, terms holds a 
dictionary with the mongo parameters and not a list.

I will try to open an issue and submit a pull request for fixing this.

- David


On Saturday, November 4, 2017 at 6:29:30 PM UTC+2, Marcelo Oliveira wrote:
>
> Hello everybody, 
>
> I am learning ansible through its official documentation and videos on 
> youtube, but sadly I can't get it working with its lookup-mongodb module as 
> described at 
> http://docs.ansible.com/ansible/latest/playbooks_lookups.html#mongodb-lookup
> I am using Ubuntu 16.04 based distro (Elementary OS Loki), Python 2.7.12, 
> ansible 2.4.1.0 (installed from ppa:ansible/ansible) and I have 
> also python-pymongo version 3.2-1build1 installed.
>
> When I try to run the example taught in the official documentation (see 
> link above), I got the following error:
>
>
> app@store:~/ansible_tutorial$ ansible-playbook playbook.yml -vvv
> ansible-playbook 2.4.1.0
>   config file = /home/app/ansible_tutorial/ansible.cfg
>   configured module search path = [u'/home/app/.ansible/plugins/modules', 
> u'/usr/share/ansible/plugins/modules']
>   ansible python module location = /usr/lib/python2.7/dist-packages/ansible
>   executable location = /usr/bin/ansible-playbook
>   python version = 2.7.12 (default, Nov 19 2016, 06:48:10) [GCC 5.4.0 
> 20160609]
> Using /home/app/ansible_tutorial/ansible.cfg as config file
> Parsed /home/app/ansible_tutorial/hosts inventory source with ini plugin
>
> PLAYBOOK: playbook.yml 
> **************************************************************************************************************************************************
> 1 plays in playbook.yml
>
> PLAY [localhost] 
> ********************************************************************************************************************************************************
> META: ran handlers
>
> TASK [debug] 
> ************************************************************************************************************************************************************
> task path: /home/app/ansible_tutorial/playbook.yml:26
> The full traceback is:
> Traceback (most recent call last):
>   File 
> "/usr/lib/python2.7/dist-packages/ansible/executor/task_executor.py", line 
> 88, in run
>     items = self._get_loop_items()
>   File 
> "/usr/lib/python2.7/dist-packages/ansible/executor/task_executor.py", line 
> 216, in _get_loop_items
>     items = mylookup.run(terms=loop_terms, variables=self._job_vars, 
> wantlist=True)
>   File 
> "/usr/lib/python2.7/dist-packages/ansible/plugins/lookup/mongodb.py", line 
> 210, in run
> *    connection_string = term.get(u'connection_string', 
> u"mongodb://localhost")*
> *AttributeError: 'unicode' object has no attribute 'get'*
>
> *fatal: [localhost]: FAILED! => {*
> *    "msg": "Unexpected failure during module execution.", *
> *    "stdout": ""*
> *}*
> to retry, use: --limit @/home/app/ansible_tutorial/playbook.retry
>
> PLAY RECAP 
> **************************************************************************************************************************************************************
> localhost                  : ok=0    changed=0    unreachable=0   
>  failed=1 
>
>
> As far as I can understand, those bold lines are telling me what is going 
> wrong, the connection to the database.
> I've searched everywhere I could on internet and watched many ansible 
> videos on youtube but I couldn't find how I can fix it, it must be 
> something very simple.
>
> From the MongoDB side:
> I installed it in the same machine, it is running, and it has the local 
> database and startup_log collection, as you may find below:
>
> app@store:~/ansible_tutorial$ mongo
> MongoDB shell version: 3.2.17
> connecting to: test
> Server has startup warnings: 
> 2017-11-04T09:39:25.859-0200 I CONTROL  [initandlisten] 
> 2017-11-04T09:39:25.859-0200 I CONTROL  [initandlisten] ** WARNING: 
> /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
> 2017-11-04T09:39:25.859-0200 I CONTROL  [initandlisten] **        We 
> suggest setting it to 'never'
> 2017-11-04T09:39:25.859-0200 I CONTROL  [initandlisten] 
> > show dbs
> *local  0.000GB*
> > use local
> switched to db local
> > show collections
> *startup_log*
> > db.startup_log.find()
> { "_id" : "store-1509763862598", "hostname" : "store", "startTime" : 
> ISODate("2017-11-04T02:51:02Z"), "startTimeLocal" : "Sat Nov  4 
> 00:51:02.598", "cmdLine" : { "config" : "/etc/mongod.conf", "net" : { 
> "bindIp" : "127.0.0.1", "port" : 27017 }, "storage" : { "dbPath" : 
> "/var/lib/mongodb", "journal" : { "enabled" : true } }, "systemLog" : { 
> "destination" : "file", "logAppend" : true, "path" : 
> "/var/log/mongodb/mongod.log", "quiet" : true } }, "pid" : 
> NumberLong(9044), "buildinfo" : { "version" : "3.2.17", "gitVersion" : 
> "186656d79574f7dfe0831a7e7821292ab380f667", "modules" : [ ], "allocator" : 
> "tcmalloc", "javascriptEngine" : "mozjs", "sysInfo" : "deprecated", 
> "versionArray" : [ 3, 2, 17, 0 ], "openssl" : { "running" : "OpenSSL 1.0.2g 
>  1 Mar 2016", "compiled" : "OpenSSL 1.0.2g  1 Mar 2016" }, 
> "buildEnvironment" : { "distmod" : "ubuntu1604", "distarch" : "x86_64", 
> "cc" : "/opt/mongodbtoolchain/v2/bin/gcc: gcc (GCC) 5.4.0", "ccflags" : 
> "-fno-omit-frame-pointer -fPIC -fno-strict-aliasing -ggdb -pthread -Wall 
> -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -O2 
> -Wno-unused-local-typedefs -Wno-unused-function 
> -Wno-deprecated-declarations -Wno-unused-but-set-variable 
> -Wno-missing-braces -fno-builtin-memcmp", "cxx" : 
> "/opt/mongodbtoolchain/v2/bin/g++: g++ (GCC) 5.4.0", "cxxflags" : 
> "-Wnon-virtual-dtor -Woverloaded-virtual -Wno-maybe-uninitialized 
> -std=c++11", "linkflags" : "-fPIC -pthread -Wl,-z,now -rdynamic 
> -fuse-ld=gold -Wl,-z,noexecstack -Wl,--warn-execstack", "target_arch" : 
> "x86_64", "target_os" : "linux" }, "bits" : 64, "debug" : false, 
> "maxBsonObjectSize" : 16777216, "storageEngines" : [ "devnull", 
> "ephemeralForTest", "mmapv1", "wiredTiger" ] } }
> { "_id" : "store-1509795565866", "hostname" : "store", "startTime" : 
> ISODate("2017-11-04T11:39:25Z"), "startTimeLocal" : "Sat Nov  4 
> 09:39:25.866", "cmdLine" : { "config" : "/etc/mongod.conf", "net" : { 
> "bindIp" : "127.0.0.1", "port" : 27017 }, "storage" : { "dbPath" : 
> "/var/lib/mongodb", "journal" : { "enabled" : true } }, "systemLog" : { 
> "destination" : "file", "logAppend" : true, "path" : 
> "/var/log/mongodb/mongod.log", "quiet" : true } }, "pid" : 
> NumberLong(7673), "buildinfo" : { "version" : "3.2.17", "gitVersion" : 
> "186656d79574f7dfe0831a7e7821292ab380f667", "modules" : [ ], "allocator" : 
> "tcmalloc", "javascriptEngine" : "mozjs", "sysInfo" : "deprecated", 
> "versionArray" : [ 3, 2, 17, 0 ], "openssl" : { "running" : "OpenSSL 1.0.2g 
>  1 Mar 2016", "compiled" : "OpenSSL 1.0.2g  1 Mar 2016" }, 
> "buildEnvironment" : { "distmod" : "ubuntu1604", "distarch" : "x86_64", 
> "cc" : "/opt/mongodbtoolchain/v2/bin/gcc: gcc (GCC) 5.4.0", "ccflags" : 
> "-fno-omit-frame-pointer -fPIC -fno-strict-aliasing -ggdb -pthread -Wall 
> -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -O2 
> -Wno-unused-local-typedefs -Wno-unused-function 
> -Wno-deprecated-declarations -Wno-unused-but-set-variable 
> -Wno-missing-braces -fno-builtin-memcmp", "cxx" : 
> "/opt/mongodbtoolchain/v2/bin/g++: g++ (GCC) 5.4.0", "cxxflags" : 
> "-Wnon-virtual-dtor -Woverloaded-virtual -Wno-maybe-uninitialized 
> -std=c++11", "linkflags" : "-fPIC -pthread -Wl,-z,now -rdynamic 
> -fuse-ld=gold -Wl,-z,noexecstack -Wl,--warn-execstack", "target_arch" : 
> "x86_64", "target_os" : "linux" }, "bits" : 64, "debug" : false, 
> "maxBsonObjectSize" : 16777216, "storageEngines" : [ "devnull", 
> "ephemeralForTest", "mmapv1", "wiredTiger" ] } }
> > 
>
> Does anyone have an idea on how I can get it working?
>
>
> Many thanks,
> Marcelo
>

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