Unable to parse template language expression 'encodeURIComponent([parameters('table_storage_name')])' - azure-devops

Question

Hey I am doing a CI/CD deployment for a logic app, I have a table storage where I store some data, I have two table storage for test and prod environment. I created a parameter called *table_storage_name" in ARM template :
"parameters": {
// ....
"connections_azuretables_1_externalid": {
"defaultValue": "/subscriptions/e5..../resourceGroups/myrg.../providers/Microsoft.Web/connections/azuretables-1",
"type": "String"
},
"table_storage_name": {
"defaultValue": "testdevops",
"type": "String"
}
}
The error comes from when I reference the parameter here in template.json file:
// ...
"Insert_Entity": {
"runAfter": {
"Initialize_variable": [
"Succeeded"
]
},
"type": "ApiConnection",
"inputs": {
"body": {
"PartitionKey": "#body('Parse_JSON')?['name']",
"RowKey": "#body('Parse_JSON')?['last']"
},
"host": {
"connection": {
"name": "#parameters('$connections')['azuretables_1']['connectionId']"
}
},
"method": "post",
// problem occur after this line
"path": "/Tables/#{encodeURIComponent('[parameters('table_storage_name')]')}/entities"
}
}
but get this error:
InvalidTemplate: The template validation failed: 'The template action 'Insert_Entity' at line '1' and column '582' is not valid: "Unable to parse template language expression 'encodeURIComponent([parameters('table_storage_name')])': expected token 'Identifier' and actual 'LeftSquareBracket'.".'.
I tried escaping the quote with a backslash like: encodeURIComponent(\'[parameters('table_storage_name')]\') or encodeURIComponent('[parameters(''table_storage_name'')]') but all of them raise an error. How can I reference a paramter inside encodeURIComponent in an ARM template ?

Answer 1

As discussed in the comments. credits: #marone
"path": "/Tables/#{encodeURIComponent(parameters('table_storage_name'))}/entities"

Answer 2

Found the solution from this link https://platform.deloitte.com.au/articles/preparing-azure-logic-apps-for-cicd
but here are the steps to reference a parameter logic app:
create an ARM parameter table_storage_name_armparam in template.json, in order to use it's value to reference the value of the ARM parameter (yes it's confusing but follow along you'll understand):
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"table_storage_name_armparam": {
"type": "String"
}
},
"variables": {},
"resources": [
{
......
}
Now in the logic app parameter value (in the bottom of json file) create the logic app parameter table_storage_name and the value of this parameter will be the ARM parameter created in step 1:
.......
"parameters": {
"$connections": {
"value": {
"azuretables": {
"connectionId": "[parameters('connections_azuretables_externalid')]",
"connectionName": "azuretables",
"id": "/subscriptions/xxxxx-xxxx-xxxx-xxxxxxxx/providers/Microsoft.Web/locations/francecentral/managedApis/azuretables"
}
}
},
"table_storage_name": {
"value": "[parameters('table_storage_name_armparam')]"
}
}
}
}
]
}
finally, reference the logic app parameter value as follow:
"path": "/Tables/#{encodeURIComponent(parameters('table_storage_name'))}/entities"