@zargu/couchdb-designer/src/testing/changes/filter.js

Create and testing couchdb design document form directory structure.

import {getTestContext} from '../../../build/testing/testEnvironment';
import supplementRequest from '../../util/supplementRequest';


const getDocument = (database,id) => {
    for(let document of database){
        if(document._id === id){
            return document;
        }
    }
}


const filter = (contextId,req) => {
   
    if(typeof req === 'object'){
        let {filter,request} = req;
        if(filter){
            let {changes,database,context,type} = getTestContext(contextId);
            let filterError = false;
            let result = changes.filter(sequence => {
                let filterRequest = supplementRequest(request,sequence.id,contextId,'testdatabase/_changes',true);
                let doc = getDocument(database.data,sequence.id);
                let ddocName = filter.split('/')[0];
                let filterName = filter.split('/')[1];
                try{
                    let filterResult = ''
                    if(type === 'context'){
                        if(context.filters && context.filters[filterName]){
                            filterResult = context.filters[filterName](doc,filterRequest);
                        }else{
                            throw({filterError:`It is not ${filterName} filter in ${context.id}!`});
                        }
                    }else{
                        if(context[ddocName]){
                            if(context[ddocName].filters && context[ddocName].filters[filterName]){
                                filterResult = context[ddocName].filters[filterName](doc,filterRequest);
                            }else{
                                throw({filterError:`It is not ${filterName} filter in ${context[ddocName].id}!`});
                            }
                        }else{
                            throw({filterError:`It is not ${ddocName} design document in testdatabase!`});
                        }
                    }
                    if(typeof filterResult === 'boolean'){
                        return filterResult;
                    }else{
                        throw({filterError:`Filter function must return boolean result. Yours is ${typeof filterResult}!`});
                    }
                }catch(err){
                    filterError = err;
                }
            });

            if(filterError){
                if(filterError.filterError){
                    throw(filterError.filterError);
                }else{
                    throw(`Your ${filterName} filter function throw: ${filterError.message}`);
                }
            }else{
                return {results:result,last_seq:changes[changes.length-1].seq}
            }
            
        }else{
            throw('The request object must contain a filter field to specify the filter.');
        }   
    }else{
        throw('After the "_changes" you have to give an object or leave its spot empty.');
    }
}


export default filter;