Updated query docs in API ref to reflect the features of the new query parser
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@ -23,7 +23,7 @@ let merlots = wines.filtered('variety == $0 && vintage <= $1', 'Merlot', maxYear
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```
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### Relational operators
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### Conditional operators
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You can use equality comparison on all property types:
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`==` and `!=`
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@ -35,7 +35,7 @@ Example:
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let oldContacts = realm.objects('Contact').filtered('age > 2');
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```
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Note that for boolean properties, you should test against the expected keyword.
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Note that for boolean properties, you should test against `true` or `false`.
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Example:
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```JS
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@ -43,7 +43,7 @@ let women = realm.objects('Contact').filtered('isMale == false');
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```
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### String operators
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For string properties, prefix, suffix, and substring queries are supported by using the `BEGINSWITH`, `ENDSWITH`, and `CONTAINS` operators.
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For string properties, prefix, suffix, and substring queries are supported by using the `BEGINSWITH`, `ENDSWITH`, `CONTAINS` and `LIKE` operators.
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For any string operation you can append `[c]` to the operator to make it case insensitive.
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@ -53,6 +53,58 @@ let peopleWhoseNameContainsA = realm.objects('Contact').filtered('name CONTAINS[
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let Johns = realm.objects('Contact').filtered('name ==[c] "john"');
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```
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You can do simple wildcard matching with `LIKE` which supports using `?` to match a single character and `*` to match zero or multiple characters.
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Example:
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```JS
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// Matches "John" and "Johnny"
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let Johns = realm.objects('Contact').filtered('name LIKE "John*"');
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```
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### Composition
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Use parentheses and the `&&`/`AND` and `||`/`OR` operators to compose queries. You can negate a predicate with `!`/`NOT`.
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### Queries on collections
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When objects contain lists you can query into them using the collection operators `ANY`, `ALL` and `NONE`.
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Example:
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```JS
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// Find contacts with one or more teenage friends
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let teens = realm.objects('Contact').filtered('ANY friends.age < 14');
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// Find contacts where all friends are older than 21
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let adults = realm.objects('Contact').filtered('ALL friends.age > 21');
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```
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You can query on aggregates over properties in the lists using the aggregate operators `.@count`, `.@avg`, `.@min`, `.@max` and `.@sum`.
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Example:
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```JS
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// Find contacts without friends
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let teens = realm.objects('Contact').filtered('friends.@count == 0');
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// Find contacts where the average age of their friends is above 40
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let adults = realm.objects('Contact').filtered('friends.@avg.age > 40"');
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```
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Subqueries using the `SUBQUERY` operator allows you to filter the lists across multiple parameters while querying them.
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Example:
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```JS
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// Find contacts with friends above 21 in SF
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let teens = realm.objects('Contact').filtered('SUBQUERY(friends, $friend, $friend.age > 21 AND $friend.city = 'SF').@count > 0');
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```
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### Backlink queries
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Other objects can link to an object and you can query on that releationship using the `@links` and `@links.ClassName.PropertyName` syntax:
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Example:
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```JS
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// Find contacts with no incomming links
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let lonely = realm.objects('Contact').filtered('@links.@count == 0);
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// Find contacts where someone from SF has them as friends
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realm.objects('Contact').filtered('@links.Contact.friends.city == "SF");
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```
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