\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Oleksandr Isaryk (oisar)}
\pdfinfo{
  /Title (angular-firebase.pdf)
  /Creator (Cheatography)
  /Author (Oleksandr Isaryk (oisar))
  /Subject (Angular Firebase Cheat Sheet)
}

% Lengths and widths
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\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{575E5C}
\definecolor{LightBackground}{HTML}{F4F4F4}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Angular Firebase Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Oleksandr Isaryk (oisar)} via \textcolor{DarkBackground}{\uline{cheatography.com/80798/cs/19429/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Oleksandr Isaryk (oisar) \\
  \uline{cheatography.com/oisar} \\
        \uline{\seqsplit{usefur}.com}
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 22nd April, 2019.\\
   Updated 22nd April, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Get all from collection}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{this.db.collection(collection)} \newline .valueChanges() \newline .subscribe();} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Returns the current state of the collection (observable). \newline Is great for only displaying data, we don't receive any metadata and id.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Querying snapshotChanges vs stateChanges}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{this.db.collection(collection)} \newline .valueChanges().subscribe( \newline    snaps =\textgreater{} \{ \newline       const collection = snaps.map( snap =\textgreater{} \{ \newline           return \{ \newline              id: snap.payload.doc.id, \newline              \seqsplit{...snap.payload.doc.data()} \newline           \} \newline       \} \newline     \} \newline );} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Receive document snapshot with type and payload. Returns an observable with all data.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Querying snapshotChanges vs stateChanges}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{this.db.collection(collection)} \newline .stateChanges().subscribe( \newline    snaps =\textgreater{} \{ \newline       const collection = snaps.map( snap =\textgreater{} \{ \newline           return \{ \newline              id: snap.payload.doc.id, \newline              \seqsplit{...snap.payload.doc.data()} \newline           \} \newline       \} \newline     \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Receive document snapshot with type and payload. Returns an observable with only updated data (live updated).}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Querying with ordering}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{this.db.collection(collection}, ref =\textgreater{} \{ \newline   return \seqsplit{ref.orderBy(param).where(param}, "==", what) \newline \}) \newline .snapshotChanges()...\}\} \newline ... \newline .where(param, "== , \textgreater{}, \textless{}= or any", what)... \newline .where(param, "array-contains", what)... \newline .startAt(number).endAt(number)... (first element included) \newline .startAfter(number).endAt(number)...(first element is not included)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Ordered by params.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Update collection}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{this.db.doc(collection/id).set(changes)...} \newline  \newline this.db.doc(collection/id).update(changes)...} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{set - update the collection or create one if not exist \newline update - only update the collection}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Batch collection}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{const fRef = \seqsplit{this.db.doc(collection/id).ref;} \newline const oRef = \seqsplit{this.db.doc(collection/id).ref;} \newline  \newline const batch = \seqsplit{this.db.firestore.batch();} \newline  \newline batch.update(fRef, \{ updates \}); \newline ... \newline const batch\$ = of(batch.commit()); \newline batch\$.subscribe();} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Updates documents by its ref. Up to 500 data operation in the same batch.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Delete collection}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{const d = this.db \newline .collection(collection); \newline return d.doc(id).delete();} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Delete document by id}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Simple file upload}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{private storage: AngularFireStorage; \newline ... \newline upload(event) \{ \newline  const file: File = event.target.files{[}0{]}; \newline  const path = \seqsplit{`collection/id/filename`;} \newline  const task = this.storage.upload (path, file); \newline  \seqsplit{task.snapshotChanges().subscribe();} \newline \} \newline ... \newline task.percentageChanges() - get current upload percentage} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{File upload info and metadata}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{profileUrl: Observable\textless{}string | null\textgreater{}; \newline   constructor(private storage: AngularFireStorage) \{ \newline      const ref = \seqsplit{this.storage.ref('users/davideast.jpg');} \newline      this.profileUrl = ref.getDownloadURL(); \newline   \} \newline ... \newline meta: Observable\textless{}any\textgreater{}; \newline   constructor(private storage: AngularFireStorage) \{ \newline      const ref = \seqsplit{this.storage.ref('users/davideast.jpg');} \newline      this.meta = ref.getMetadata(); \newline   \} \newline ... \newline uploadFile(event) \{ \newline     const file = event.target.files{[}0{]}; \newline     const filePath = \seqsplit{'name-your-file-path-here';} \newline     const ref = \seqsplit{this.storage.ref(filePath);} \newline     const task = ref.put(file, \{ customMetadata: \{ blah: 'blah' \} \}); \newline   \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}