constraints
constraints are used to specified search/filter criteria over the properties defined for objects (Entity, Image, Connection, etc).
Supported operators for properties are:
<(less than)<=(less or equal than)==(equal to)!=(different than)>(greater than)>=(greater or equal than)in(is in)not in(is not in)
NOTE: Only the "==", "in", and "not in" operators are supported for "_uniqueid".
Constraints for specific properties are defined as key-value pairs, where the key is the name of the property and the value is an array with operators and constraints values. Here is an example:
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"age": [">=", 20, "<=", 90],
"score": ["<=", 75],
"area": ["==", 51]
},
"results": {
"list": ["age"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"age": 20
}, {
"age": 40
}, {
"age": 60
}, {
"age": 80
}],
"returned": 4,
"status": 0
}
}]
The "in" operator expects an array of values to check a given property's value against to find match(es), as follows:
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"age": [">=", 20, "<=", 90],
"score": ["<=", 75],
"area": ["==", 51],
"name": [
"in",
["creature4", "creature6"]
]
},
"results": {
"list": ["name"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"name": "creature4"
}, {
"name": "creature6"
}],
"returned": 2,
"status": 0
}
}]
The default conjunction is "AND".
For instance, in the first case, the constraints will express that the command will retrieve objects where "age" have values between [20,90], AND "score" have a value less or equal to 75, AND "area" have a value equal to 51, AND "name" is equal to either creature5.
An "OR" conjunction can be explicitly specified as follows:
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"any": {
"age": [">=", 20, "<=", 90],
"score": ["<=", 75],
"area": ["==", 51],
"name": [
"in",
["creature3", "creature5"]
]
}
},
"results": {
"list": ["name"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"name": "creature1"
}, {
"name": "creature2"
}, {
"name": "creature3"
}, {
"name": "creature4"
}, {
"name": "creature5"
}, {
"name": "creature6"
}, {
"name": "creature7"
}, {
"name": "creature8"
}, {
"name": "creature9"
}, {
"name": "creature10"
}],
"returned": 10,
"status": 0
}
}]
In a similar manner, and "AND" conjunction can be explicitly specified as follows:
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"all": {
"age": [">=", 20, "<=", 90],
"score": ["<=", 75],
"area": ["==", 51],
"name": [
"in",
["creature2"]
]
}
},
"results": {
"list": ["name"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"name": "creature2"
}],
"returned": 1,
"status": 0
}
}]
When querying for a time property, a "_date" keyword should be used following the syntax:
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"all": {
"dob": [
"==",
{
"_date": "2018-02-27T13:45:12-08:00"
}
]
}
},
"results": {
"list": ["name"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"name": "creature1"
}],
"returned": 1,
"status": 0
}
}]
Example +++++++
[{
"FindEntity": {
"with_class": "living",
"constraints": {
"age": [">=", 20, "<=", 90],
"name": [
"in",
["creature1", "creature2", "creature3"]
],
"dob": [
">",
{
"_date": "2018-02-27T13:45:12-08:00"
}
]
},
"results": {
"list": ["name"]
}
}
}]
Successful response:
[{
"FindEntity": {
"entities": [{
"name": "creature2"
}, {
"name": "creature3"
}],
"returned": 2,
"status": 0
}
}]