Added projection aggregation operator #9
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This pull request simply just allows you to specify the fields needed for the joining collection. I couldn't get the nested join to work because I didn't have the array indices on hand needed to put the `rightRecord` at the correct index.
Use it like a normal projection:
````
join({
joinCollection: collection,
leftKeys: ['keys'],
rightKeys: ['keys'],
newKey: 'newKey',
projection: { 'column1': 1, 'column2': 0 }
})
````
From what I could see there wasn't any information I could use that would give me the array index of a particular `rightRecord`, if the join involved an array. Instead I just wrote a small function called `correlate()` that correlates a `rightRecord` with its array position based on the `leftKeys` and `rightKeys`. This works now for joins involving array data.
|
I just added a working method for nested joins as well. |
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Select fields from the joining table using the
projectionfield. Use it like a normal projection: