[英]Mongo DB Search and sort not working - collection.find(...).sort is not a function
[英]How to specify function to collection.find() dynamically
如何將函數logic
傳遞給find
-function以便在每個文檔上使用它?
我試圖用屬性中的某些值遞歸地找到Mongo文檔。 我已經定義了一個“算法”,並希望對find
-function做到這一點,但是盡管閱讀了有關查詢,搜索和find()
,但我還是沒有運氣。
// match every node with propertyname "Reference" with the exact value "43_1"
var logic = function(currentKey, currentValue) {
return ( currentKey == "Reference" && currentValue === "43_1" );
};
db.getCollection('metavalg').find(function() {
function recurSearchObj(doc) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" && doc[key] !== null ) {
return recurSearchObj(doc[key]);
} else {
// invoke matching-logic
return logic(key, doc[key]);
}
});
}
// search document recursively
return recurSearchObj(this);
})
在弗拉基米爾M的幫助下,我最終重新存儲了代碼並執行以下操作:
db.getCollection('metavalg').find(function() {
function inspectObj(doc, logic) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" && doc[key] !== null ) {
return inspectObj(doc[key], logic);
} else {
return logic(key, doc[key]);
}
});
}
return inspectObj(this, function(currentKey, currentValue) {
return ( currentKey == "Nummer" && currentValue === "43_1" );
//return ( currentKey == "Navn" && /max\.? 36/i.test(currentValue) );
});
})
您可以將邏輯方法作為參數傳遞給遞歸搜索對象:
// match every node with propertyname "Reference" with the exact value "43_1"
var logic = function(currentKey, currentValue) {
return ( currentKey == "Reference" && currentValue === "43_1" );
};
db.getCollection('metavalg').find(function() {
function recurSearchObj(doc, aLogic) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" && doc[key] !== null ) {
return recurSearchObj(doc[key], aLogic);
} else {
// invoke matching-logic
if( aLogic(key, doc[key]) ){
// then do somthing
}
}
});
}
// search document recursively
return recurSearchObj(this, logic);
});
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