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If I made a buffer around points and I am uniting those buffers that are in contact with each other.

Now I want to make an attribute column in those united buffers that tells me what points are inside each buffer. Each point has an ID code.

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  • A spatial join will allow you to identify the polygon each point is in. But turning that around results in a one-to-many, which results in a list, and lists are bad relational design (antipattern). Commented Mar 9 at 20:12
  • What should I do when someone answers my question? Commented Mar 27 at 13:25

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First, buffer the points and dissolve the buffers. Then use the tool "Multiparts to singleparts" from the toolbox. Optional: add a new ID field using the field calculator and as value $id. This results in an attribute with an autoincrement ID for each new feature and it is easier to identify/use the buffer features in subsequent steps.

Second, in the buffer layer (with individual features) add a new field (data type: 'Text') using the field calculator and enter the following:

array_to_string(
    overlay_intersects('pts', "id"),
    ', '
)

Here, 'pts' is the name of your point layer and "id" is the name of your ID field in said layer. Here are the results with my test data:

enter image description here

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  • 3
    The Multiparts to singleparts tool can be skipped if the option 'Keep disjoint results separate' is checked on in the Buffer tool. Commented Mar 10 at 17:10

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