Unable to order by associations conditionally

I have a model, say Base which has one Details1 model or has one Details2 model depending on the value of a field “type” (which says either details1 or details2).

Both Details1 and Details2 have a field “orderField”.

I need a way to order rows of the Base model by either Details1.orderField or Details2.orderField depending on whether Base.type = details1 or details2

I have tried looking up the sequelize docs relating to ordering: http://docs.sequelizejs.com/manual/querying.html#ordering

Approach 1:

{
  include: [
     { model: Details1 },
     { model: Details2 }
  ],
  order: [
     [
       { model: Details1, as: 'Details1' }, 'orderField', 'DESC'
     ],[
       { model: Details2, as: 'Details2' }, 'orderField', 'DESC'
     ]
  ]
});

The above code however orders rows of Base models by Details1.orderField separately and by Details2.orderField separately.

For instance, if I had the following data:

{type: details1, Details1: {orderField: 2}}
{type: details2, Details2: {orderField: 1}}
{type: details2, Details2: {orderField: 5}}
{type: details1, Details1: {orderField: 4}}
{type: details2, Details2: {orderField: 3}}

Then the expected order is:

{type: details2, Details2: {orderField: 5}}
{type: details1, Details1: {orderField: 4}}
{type: details2, Details2: {orderField: 3}}
{type: details1, Details1: {orderField: 2}}
{type: details2, Details2: {orderField: 1}}

However, I am getting the output as:

{type: details1, Details1: {orderField: 4}}
{type: details1, Details1: {orderField: 2}}
{type: details2, Details2: {orderField: 5}}
{type: details2, Details2: {orderField: 3}}
{type: details2, Details2: {orderField: 1}}

Approach 2:

{
  include: [
     { model: Details1, as: 'Details1' },
     { model: Details2, as: 'Details2' }
  ],
  order: [
     [
        sequelize.literal('case when "Base".type = \'details1\' then "Details1".orderField else "Details2".orderField end'
        )
      ]
  ]
};

However, this fails with an error: missing FROM-clause entry for table “Details1”

Environment

Dialect:

• mysql
• postgres
• sqlite
• mssql
• any Dialect library version: XXX Database version: XXX Sequelize version: 3.30.4 Node Version: 6.13.0 OS: XXX If TypeScript related: TypeScript version: XXX Tested with latest release:
• No
• Yes, specify that version:

[Jigar-Freightwalla]

@papb Thank you for the prompt response.

[github-actions[bot]]

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