facet （MongoDB搜索操作符）

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db.movies.aggregate([
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  {
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    "$searchMeta": {
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      "facet": {
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        "operator": {
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          "range": {
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            "path": "released",
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            "gte": ISODate("2000-01-01T00:00:00.000Z"),
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            "lte": ISODate("2015-01-31T00:00:00.000Z")
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          }
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        },
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        "facets": {
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          "directorsFacet": {
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            "type": "string",
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            "path": "directors",
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            "numBuckets" : 7
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          },
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          "yearFacet" : {
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            "type" : "number",
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            "path" : "year",
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            "boundaries" : [2000,2005,2010, 2015]
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          }
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        }
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      }
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    }
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  }
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])

1
db.movies.aggregate([
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 {
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   "$search": {
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     "facet": {
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       "operator": {
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         "near": {
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           "path": "released",
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           "origin": ISODate("1999-07-01T00:00:00.000+00:00"),
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           "pivot": 7776000000
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         }
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       },
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       "facets": {
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         "genresFacet": {
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           "type": "string",
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           "path": "genres"
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         }
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       }
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     }
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   }
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 },
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 { "$limit": 2 },
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 {
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   "$facet": {
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     "docs": [
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       { "$project":
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         {
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           "title": 1,
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           "released": 1
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         }
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       }
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     ],
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     "meta": [
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       {"$replaceWith": "$$SEARCH_META"},
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       {"$limit": 1}
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     ]
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   }
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 },
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 {
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   "$set": {
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     "meta": {
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       "$arrayElemAt": ["$meta", 0]
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     }
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   }
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 }
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])

1
db.companies.aggregate([
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 {
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   "$searchMeta": {
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     "returnStoredSource": true,
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     "returnScope": {
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       "path": "funding_rounds"
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     },
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     "facet": {
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       "operator": {
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         "text": {
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           "path": "funding_rounds.raised_currency_code",
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           "query": "USD"
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         }
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       },
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       "facets": {
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         "raisedAmountFacet": {
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           "type": "number",
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           "path": "funding_rounds.raised_amount",
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           "boundaries": [5000000, 5250000, 5500000]
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         }
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       }
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     }
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   }
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 }
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])

1
db.listingsAndReviews.aggregate([
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  {
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    $searchMeta: {
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      facet: {
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        facets: {
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          accommodatesFacet: {
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            path: "accommodates",
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            type: "number",
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            boundaries: [1,2,4,8],
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          },
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          cancellationFacet: {
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            path: "cancellation_policy",
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            type: "string",
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          },
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          roomTypeFacet: {
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            path: "room_type",
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            type: "string",
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          }
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        },
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        operator: {
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          compound: {
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            must: [
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              {
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                text: {
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                  path: "description",
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                  query: "new york city",
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                },
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              },
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            ],
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            filter: [
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              {
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                equals: {
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                  path: "cancellation_policy",
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                  value: "moderate",
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                  doesNotAffect:
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                    "cancellationFacet",
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                },
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              },
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            ],
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          },
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        },
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      },
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    }
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  },
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]

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db.listingsAndReviews.aggregate([
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  {
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    $searchMeta: {
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      facet: {
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        facets: {
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          accommodatesFacet: {
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            path: "accommodates",
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            type: "number",
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            boundaries: [1,2,4,8],
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          },
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          cancellationFacet: {
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            path: "cancellation_policy",
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            type: "string",
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          },
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          roomTypeFacet: {
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            path: "room_type",
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            type: "string",
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          }
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        },
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        operator: {
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          compound: {
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            must: [
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              {
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                text: {
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                  path: "description",
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                  query: "new york city",
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                },
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              },
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            ],
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            filter: [
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              {
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                equals: {
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                  path: "cancellation_policy",
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                  value: "moderate",
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                  doesNotAffect:
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                    "accommodatesFacet",
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                },
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              },
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            ],
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          },
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        },
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      },
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    },
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  },
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]