Detecting repeated keys in a query for a REST connector in loopback

Can anyone help me figure out how to duplicate parameters in a loopback REST connector query? Here's the code snippet I'm working with:

details: {
    'template': {
      'method': 'GET',
      'debug': true,
      'url': 'https://www.example.com/data',
      'timeout': 10000,
      'headers': {
        'Authorization': 'Bearer {token}'
      },
      'query': {
        q: 'PHOTOS'
        q: 'DETAILS', // This is where I want to duplicate parameters
        id: '{id}'
      },
      'options': {
        'useQuerystring': true
      },
      'responsePath': '$'
    },
    'functions': {
      'searchData': [
        'token',
        'id'
      ]
    }
  }

The issue is that it seems like Loopback overrides the value of the parameter `q` with the last one, so I only get information for the last parameter. Any ideas on how to solve this problem would be greatly appreciated!

Thank you in advance.

javascriptnode.jsrestloopbackjsstrongloop

Answer №1

To pass them as an array, simply do:

  'query': {
    q: ['PHOTOS', 'DETAILS'],
    id: '{id}'
  },

Remember that the options key is utilized when making a request using the REST connector. Here's the documentation for useQuerystring:

  • useQuerystring - Decide whether to use querystring or qs to stringfiy and parse querystrings. Setting this option to true will serialize arrays as foo=bar&foo=baz instead of foo[0]=bar&foo[1]=baz.

If you exclude it, your result would be something like ?q[0]=PHOTOS&q[1]=DETAILS.

You can also introduce another option:

  • qsStringifyOptions - object with options to include in the qs.stringify method. Another method to pass options is by formatting them for the querystring.stringify method similar to {sep:';', eq:':', options:{}}. For example, to alter how arrays are converted to query strings with the qs module, provide the arrayFormat option with either indices|brackets|repeat

This additional setting can lead to the same output:

  "options": {
    "qsStringifyOptions": {
      "arrayFormat": "repeat"
    }
  }

If you prefer just having brackets (like ?q[]=PHOTOS&q[]=DETAILS), specify the brackets option:

  "options": {
    "qsStringifyOptions": {
      "arrayFormat": "brackets"
    }
  }

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