mongodb - subdocument query not containing values outside array with regex matching -



mongodb - subdocument query not containing values outside array with regex matching -

if have collection of recipes each item looks like:

{ name: "recipe 1", ingredients: [{ name: "dark chocolate", qty: "1 g" }, { name: "milk", qty: "2 g" }, { name: "unsalted butter", qty: "3 g" }] }

how can find recipes that:

have ingredient of name either contains milk or chocolate but do not contain other ingredients do not either contain milk or chocolate?

the illustration above not match query.

summary: need recipes contain milk, chocolate or both, nil else.

using regex look looks docs not containing ingredients of milk or chocolate (using technique here) , negating $not trick:

class="lang-js prettyprint-override">db.recipes.find({'ingredients.name': {$not: /^((?!(milk|chocolate)).)*$/}})

tested against:

class="lang-js prettyprint-override">{ "_id": objectid("5114f7b748994465c5b5c369"), "name": "recipe 1", "ingredients": [ { "name": "dark chocolate", "qty": "1 g" }, { "name": "milk", "qty": "2 g" }, { "name": "unsalted butter", "qty": "3 g" } ] } { "_id": objectid("5114f9f348994465c5b5c36a"), "name": "recipe 2", "ingredients": [ { "name": "dark chocolate", "qty": "1 g" }, { "name": "milk", "qty": "2 g" } ] } { "_id": objectid("5114fcec48994465c5b5c36b"), "name": "recipe 3", "ingredients": [ { "name": "milk chocolate", "qty": "1 g" } ] } { "_id": objectid("5114fd0e48994465c5b5c36c"), "name": "recipe 4", "ingredients": [ { "name": "soy", "qty": "1 g" } ] } { "_id": objectid("5114fd5248994465c5b5c36d"), "name": "recipe 5", "ingredients": [ { "name": "chocolate mud", "qty": "1 g" } ] }

it outputs:

class="lang-js prettyprint-override">{ "_id": objectid("5114f9f348994465c5b5c36a"), "name": "recipe 2", "ingredients": [ { "name": "dark chocolate", "qty": "1 g" }, { "name": "milk", "qty": "2 g" } ] } { "_id": objectid("5114fcec48994465c5b5c36b"), "name": "recipe 3", "ingredients": [ { "name": "milk chocolate", "qty": "1 g" } ] } { "_id": objectid("5114fd5248994465c5b5c36d"), "name": "recipe 5", "ingredients": [ { "name": "chocolate mud", "qty": "1 g" } ] }

mongodb

Comments

Post a Comment

Popular posts from this blog

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer -

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer - when trying request rest service @ time of response getting exception.. feb 21, 2013 2:34:49 pm com.sun.jersey.spi.container.containerresponse mapmappablecontainerexception severe: exception contained within mappablecontainerexception not mapped response, re-throwing http container java.lang.noclassdeffounderror: not initialize class net.sf.cglib.proxy.enhancer @ org.hibernate.proxy.pojo.cglib.cgliblazyinitializer.getproxyfactory(cgliblazyinitializer.java:117) @ org.hibernate.proxy.pojo.cglib.cglibproxyfactory.postinstantiate(cglibproxyfactory.java:43) @ org.hibernate.tuple.entity.pojoentitytuplizer.buildproxyfactory(pojoentitytuplizer.java:162) @ org.hibernate.tuple.entity.abstractentitytuplizer.<init>(abstractentitytuplizer.java:135) @ org.hibernate.tuple.entity.pojoentitytuplizer.<init>(pojoentitytuplizer.java:55) @ org.hibernate.tuple.e...
Read more

Accessing MATLAB's unicode strings from C -

Accessing MATLAB's unicode strings from C - how can access underlying unicode info of matlab strings through matlab engine or mex c interfaces? here's example. let's set unicode characters in utf-8 encoded file test.txt, read as fid=fopen('test.txt','r','l','utf-8'); s=fscanf(fid, '%s') in matlab. now if first feature('defaultcharacterset', 'utf-8') , c engevalstring(ep, "s") , output text file utf-8. proves matlab stores unicode internally. if mxarraytostring(enggetvariable(ep, "s")) , unicode2native(s, 'latin-1') give me in matlab: non-latin-1 characters replaced character code 26. need getting access underlying unicode info c string in unicode format (utf-8, utf-16, etc.), , preserving non-latin-1 characters. is possible? my platform os x, matlab r2012b. addendum: documentation explicitly states "[mxarraytostring()] supports multibyte encoded characters...
Read more

javascript - mongodb won't find my schema method in nested container -

javascript - mongodb won't find my schema method in nested container - i trying access method of schema stored within mixed container. here situation : have cases model can many different things, have schema each of these things stored in "casecontent" mixed property. var caseschema = mongoose.schema({ casecontent : {}, object : {type:string, default : "null"}, collision : {type : boolean, default : false} }); the casecontent property filled model of 1 of schemas, 1 exemple : var treeschema = new mongoose.schema({ applecount : {type : number, default : 3} }); treeschema.methods.dostuff = function (data) { console.log('hey, listen'); homecoming true; }; then, want utilize method of schema original container : caseschema.methods.dostuff = function (data) { if (this.casecontent.dostuff !== undefined) { this.casecontent.dostuff(); console.log('it worked'); } else { ...
Read more