Hammer command:

hammer host create --name network-test-host --architecture-id 1 --puppet-proxy-id 1 --puppet-ca-proxy-id 1 --compute-resource-id 1 --environment-id 1 --domain-id 1 --subnet-id 2 --interface compute_network=10-10-1-0-24-net,compute_type=VirtualVmxnet3,primary=true,provision=true --compute-attributes cluster=Cluster1,cpus=4,memory_mb=8192,guest_id=centos64Guest,scsi_controller_type=ParaVirtualSCSIController,resource_pool=RP1 --operatingsystem-id 2 --partition-table-id 17 --medium-id 8 --volume size_gb=50,datastore=DS4 --hostgroup-id 7

succeeds, but when checking VMware, the network set is not the network specified. Selecting the same network through the Web UI correctly sets the network in VMware.

production.log output when creating with hammer:

Started POST "/api/hosts" for 10.0.0.184 at 2015-07-15 11:39:57 -0400
2015-07-15 11:39:57 [I] Processing by Api::V2::HostsController#create as JSON
2015-07-15 11:39:57 [I]   Parameters: {"host"=>{"name"=>"network-test-host", "environment_id"=>"1", "architecture_id"=>"1", "domain_id"=>"1", "puppet_proxy_id"=>"1", "operatingsystem_id"=>"2", "medium_id"=>"8", "ptable_id"=>"17", "subnet_id"=>"2", "compute_resource_id"=>"1", "hostgroup_id"=>"7", "puppet_ca_proxy_id"=>"1", "build"=>true, "enabled"=>true, "managed"=>true, "compute_attributes"=>{"cluster"=>"Cluster1", "cpus"=>"4", "memory_mb"=>"8192", "guest_id"=>"centos64Guest", "scsi_controller_type"=>"ParaVirtualSCSIController", "resource_pool"=>"RP1", "volumes_attributes"=>{"0"=>{"size_gb"=>"50", "datastore"=>"DS4"}}}, "host_parameters_attributes"=>{}, "interfaces_attributes"=>{"0"=>{"primary"=>"true", "provision"=>"true", "compute_attributes"=>{"network"=>"10-10-1-0-24-net", "type"=>"VirtualVmxnet3"}}}}, "apiv"=>"v2"}
2015-07-15 11:39:57 [I] Skipping user group update for user matt.chesler as usergroup_sync is disabled
2015-07-15 11:39:57 [I] Authorized user matt.chesler(Matt Chesler)
2015-07-15 11:40:22 [I] Adding Compute instance for network-test-host.example.com
2015-07-15 11:40:22 [I] Successfully decrypted field for Foreman::Model::Vmware
2015-07-15 11:40:22 [I] Successfully decrypted field for Foreman::Model::Vmware
2015-07-15 11:40:26 [I] Create DHCP reservation for network-test-host.example.com-00:50:56:a1:28:78/10.10.1.69
2015-07-15 11:40:43 [I] Add the TFTP configuration for network-test-host.example.com
2015-07-15 11:40:44 [I] Fetching required TFTP boot files for network-test-host.example.com
2015-07-15 11:40:44 [I]   Rendered api/v2/hosts/create.json.rabl (80.4ms)
2015-07-15 11:40:44 [I] Completed 200 OK in 46729ms (Views: 78.8ms | ActiveRecord: 67.2ms)
2015-07-15 11:41:22 [I] 

production.log output when creating with Web UI:

Started POST "/hosts" for 10.0.0.184 at 2015-07-15 11:51:18 -0400
2015-07-15 11:51:18 [I] Processing by HostsController#create as */*
2015-07-15 11:51:18 [I]   Parameters: {"utf8"=>"✓", "authenticity_token"=>"b6tTkXutY578Zn5NcPNi1th20FbjqsHE5DwotXRltBs=", "host"=>{"name"=>"network-test-host", "hostgroup_id"=>"7", "compute_resource_id"=>"1", "compute_profile_id"=>"1", "environment_id"=>"1", "puppet_ca_proxy_id"=>"1", "puppet_proxy_id"=>"1", "puppetclass_ids"=>[""], "managed"=>"true", "progress_report_id"=>"[FILTERED]", "type"=>"Host::Managed", "interfaces_attributes"=>{"0"=>{"_destroy"=>"0", "type"=>"Nic::Managed", "mac"=>"", "identifier"=>"", "name"=>"network-test-host", "domain_id"=>"1", "subnet_id"=>"2", "ip"=>"10.10.1.75", "managed"=>"1", "primary"=>"1", "provision"=>"1", "virtual"=>"0", "tag"=>"", "attached_to"=>"", "compute_attributes"=>{"type"=>"VirtualVmxnet3", "network"=>"10-10-1-0-24-net"}}, "new_interfaces"=>{"_destroy"=>"1", "type"=>"Nic::Managed", "mac"=>"", "identifier"=>"", "name"=>"", "domain_id"=>"", "subnet_id"=>"", "ip"=>"", "managed"=>"1", "primary"=>"0", "provision"=>"0", "virtual"=>"0", "tag"=>"", "attached_to"=>"", "compute_attributes"=>{"type"=>"VirtualE1000", "network"=>"172-16-0-0-24-net"}}}, "compute_attributes"=>{"cpus"=>"4", "corespersocket"=>"1", "memory_mb"=>"8192", "cluster"=>"Cluster1", "path"=>"/Datacenters/Cluster1/vm", "guest_id"=>"centos64Guest", "scsi_controller_type"=>"ParaVirtualSCSIController", "hardware_version"=>"Default", "start"=>"1", "volumes_attributes"=>{"new_volumes"=>{"_delete"=>"", "datastore"=>"Backups", "name"=>"Hard disk", "size_gb"=>"10", "thin"=>"true", "eager_zero"=>"false"}, "0"=>{"_delete"=>"", "datastore"=>"DS4", "name"=>"Hard disk", "size_gb"=>"50", "thin"=>"true", "eager_zero"=>"false"}}}, "architecture_id"=>"1", "operatingsystem_id"=>"2", "provision_method"=>"build", "build"=>"1", "medium_id"=>"8", "ptable_id"=>"17", "disk"=>"", "root_pass"=>"[FILTERED]", "is_owned_by"=>"4-Users", "enabled"=>"1", "model_id"=>"", "comment"=>"", "overwrite"=>"false"}, "capabilities"=>"build image", "provider"=>"Vmware"}
2015-07-15 11:51:19 [I] Adding Compute instance for network-test-host.example.com
2015-07-15 11:51:19 [I] Successfully decrypted field for Foreman::Model::Vmware
2015-07-15 11:51:19 [I] Successfully decrypted field for Foreman::Model::Vmware
2015-07-15 11:51:20 [I]