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I am trying (unsuccessfully) to reduce the size of the CONTRACTED_By relationship in this ER model using the tikz-er2 package. It naturally scales the height with the width, but I would prefer the height to be shorter. Is there any way to accomplish that? (Sorry, this is not as minimal as it could be, but I decided to replicate the figure I have.)

documentclass[12pt]{article}

usepackage{tikz,tikz-er2}



usetikzlibrary{positioning}

begin{document}



begin{tikzpicture}[node distance=1.5cm]

tikzset={every entity/.style = {minimum width=1cm,minimum height=0.8cm, text width=1cm,inner sep=1pt},

every attribute/.style = {minimum width=1.2cm,minimum height=0.5cm, text width=1.2cm,inner sep=1pt},

every relationship/.style = {minimum width=1.2cm,minimum height=0.5cm, text width=1.2cm,inner sep=1pt},

every edge/.style = {link}

}



node[entity] (worker) {WORKER};

node[attribute] (w1) [above left=1cm of worker,xshift=1cm] {uline{Number}} edge (worker);

node[attribute] (w2) [above right=1cm of worker,xshift=-1cm] {Name} edge (worker);

node[attribute] (w3) [below left=1cm of worker,xshift=1cm] {Title} edge (worker);

node[attribute] (w4) [below right=1cm of worker,xshift=-1cm] {Salary} edge (worker);



node[relationship] (worksin) [right=of worker] {WORKS_IN} edge node[above right] {N} (worker);

node[attribute] (wn1) [above=of worksin,yshift=-0.5cm] {Responsibility} edge (worksin);

node[attribute] (wn2) [below=of worksin,yshift=0.5cm] {Duration} edge (worksin);



node[entity] (project) [right=of worksin] {PROJECT} edge node[above left] {1} (worksin);

node[attribute] (p1) [above left=1cm of project,xshift=1cm] {uline{Number}} edge (project);

node[attribute] (p2) [above=of project] {Project\Name} edge (project);

node[attribute] (p3) [above right=1cm of project,xshift=-1cm] {Budget} edge (project);

node[attribute] (p4) [right= of project] {Location} edge (project);



node[relationship] (contract) [below=of project] {CONTRACTED_BY} edge node[above right] {N} (project);

node[attribute] (c1) [below left=of contract] {Contract\number} edge (contract);



node[entity] (client) [below=of contract] {CLIENT} edge node[above right] {1} (contract);

node[attribute] (cl1) [below left=1cm of client, xshift=1cm] {uline{Client name}} edge (client);

node[attribute] (cl2) [below right=1cm of client, xshift=-1cm] {Address} edge (client);



end{tikzpicture}



end{document}

You can change the aspect ratio of that node with the aspect key. By default in the style it's set to 1. Here I've changed it to 2.

documentclass[border=5pt]{standalone}

usepackage{tikz,tikz-er2}



usetikzlibrary{positioning}

begin{document}



begin{tikzpicture}[node distance=1.5cm]

tikzset={every entity/.style = {minimum width=1cm,minimum height=0.8cm, text width=1cm,inner sep=1pt},

every attribute/.style = {minimum width=1.2cm,minimum height=0.5cm, text width=1.2cm,inner sep=1pt},

every relationship/.style = {minimum width=1.2cm,minimum height=0.5cm, text width=1.2cm,inner sep=1pt},

every edge/.style = {link}

}



node[entity] (worker) {WORKER};

node[attribute] (w1) [above left=1cm of worker,xshift=1cm] {uline{Number}} edge (worker);

node[attribute] (w2) [above right=1cm of worker,xshift=-1cm] {Name} edge (worker);

node[attribute] (w3) [below left=1cm of worker,xshift=1cm] {Title} edge (worker);

node[attribute] (w4) [below right=1cm of worker,xshift=-1cm] {Salary} edge (worker);



node[relationship] (worksin) [right=of worker] {WORKS_IN} edge node[above right] {N} (worker);

node[attribute] (wn1) [above=of worksin,yshift=-0.5cm] {Responsibility} edge (worksin);

node[attribute] (wn2) [below=of worksin,yshift=0.5cm] {Duration} edge (worksin);



node[entity] (project) [right=of worksin] {PROJECT} edge node[above left] {1} (worksin);

node[attribute] (p1) [above left=1cm of project,xshift=1cm] {uline{Number}} edge (project);

node[attribute] (p2) [above=of project] {Project\Name} edge (project);

node[attribute] (p3) [above right=1cm of project,xshift=-1cm] {Budget} edge (project);

node[attribute] (p4) [right= of project] {Location} edge (project);



node[relationship,aspect=2] (contract) [below=of project,] {CONTRACTED_BY} edge node[above right] {N} (project);

node[attribute] (c1) [below left=of contract] {Contract\number} edge (contract);



node[entity] (client) [below=of contract] {CLIENT} edge node[above right] {1} (contract);

node[attribute] (cl1) [below left=1cm of client, xshift=1cm] {uline{Client name}} edge (client);

node[attribute] (cl2) [below right=1cm of client, xshift=-1cm] {Address} edge (client);



end{tikzpicture}



end{document}

I can't compile your code as I'm missing tikz-er2, but looking at your code, the box of "CONTRACTED_BY" is bigger because of the text length. I'd assume if you reduced the size of the text the box would be smaller too. You can try the following:

node[relationship] (contract) [below=of project] {small CONTRACTED_BY} edge node[above right] {N} (project);