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field-type-default-methods.js
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field-type-default-methods.js
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"use strict";
const Promise = require("bluebird");
const expandHash = require("expand-hash");
const FieldTypeDescription = require("../data-structures/field-type-description.js");
const default_methods = {
init: function() {
return null;
},
has_index: function(params) {
return false;
},
is_proper_value: function(context, params, new_value, old_value) {
return Promise.resolve();
},
format: function(context, params, decoded_value, format_params) {
return decoded_value;
},
encode: function(context, params, value_in_code) {
return value_in_code;
},
get_description: function(context, params) {
return new FieldTypeDescription(this.name);
},
decode: function(context, params, value_in_database) {
return value_in_database;
},
filter_to_query: function(context, params, query) {
return Promise.resolve(this.encode(context, params, query)).then(
function(encoded_value) {
return {
$eq: encoded_value,
};
}
);
},
full_text_search_enabled: function() {
return false;
},
get_aggregation_stages: async function(
context,
params,
field_name,
field_value_path,
query_params
) {
const self = this;
if (!query_params || !query_params.filter) return [];
const expanded_filter = expandHash(query_params.filter);
let field_filter = expanded_filter[field_name];
if (
field_filter &&
field_filter.length === 1 &&
field_filter[0] instanceof Array
) {
field_filter = field_filter[0]; // to fix an edge case where instead of array of values the array is wrapped within another array
}
if (!(field_name in expanded_filter)) {
return [];
}
if (field_name in expanded_filter && field_filter === undefined)
return [{ $match: { [field_value_path]: { $exists: false } } }];
let new_filter = null;
if (field_filter instanceof Array) {
new_filter = await Promise.all(
field_filter.map(function(element) {
return self.encode(context, params, element);
})
).then(filters => {
return { $in: filters };
});
} else {
new_filter = await self.filter_to_query(
context,
params,
field_filter
);
}
return [{ $match: { [field_value_path]: new_filter } }];
},
get_attachment_loader: function() {
return null;
},
};
module.exports = default_methods;

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